PSP Bibliography





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Found 59 entries in the Bibliography.


Showing entries from 1 through 50


2022

An Extended and Fragmented Alfv\ en Zone in the Young Solar Wind

Motivated by theoretical, numerical, and observational evidence, we explore the possibility that the critical transition between sub-Alfv\ enic flow and super-Alfv\ enic flow in the solar atmosphere takes place in fragmented and disconnected subvolumes within a general Alfv\ en critical zone. The initial observations of sub-Alfv\ enic periods by Parker Solar Probe near 16 R$_\ensuremath\odot$ do not yet provide sufficient evidence to distinguish this possibility from that of a folded surface that separates simply-connected r ...

Chhiber, Rohit; Matthaeus, William; Usmanov, Arcadi; Bandyopadhyay, Riddhi; Goldstein, Melvyn;

Published by: \mnras      Published on: mar

YEAR: 2022     DOI: 10.1093/mnras/stac779

Parker Data Used; Sun: corona; Solar wind; turbulence

Parker Solar Probe detects solar radio bursts related with a behind-the-limb active region

Context. The interpretation of solar radio bursts observed by Parker Solar Probe (PSP) in the encounter phase plays a key role in understanding intrinsic properties of the emission mechanism in the solar corona. Lower time-frequency resolution of the PSP receiver can be overcome by simultaneous ground-based observations using more advanced antennas and receivers. \ Aims: In this paper we present such observations for which the active active region 12 765, begetter of type III, J, and U solar bursts, was within sight of groun ...

Stanislavsky, Aleksander; Bubnov, Igor; Koval, Artem; Yerin, Serge;

Published by: \aap      Published on: jan

YEAR: 2022     DOI: 10.1051/0004-6361/202141984

Parker Data Used; Sun: activity; Sun: corona; Sun: radio radiation; methods: observational; space vehicles; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics

2021

Solar wind rotation rate and shear at coronal hole boundaries. Possible consequences for magnetic field inversions

Context. In situ measurements by several spacecraft have revealed that the solar wind is frequently perturbed by transient structures that have been interpreted as magnetic folds, jets, waves, and flux ropes that propagate rapidly away from the Sun over a large range of heliocentric distances. Parker Solar Probe (PSP), in particular, has detected very frequent rotations of the magnetic field vector at small heliocentric radial distances, accompanied by surprisingly large solar wind rotation rates. The physical origin of such ...

Pinto, R.~F.; Poirier, N.; Rouillard, A.~P.; Kouloumvakos, A.; Griton, L.; Fargette, N.; Kieokaew, R.; Lavraud, B.; Brun, A.~S.;

Published by: \aap      Published on: sep

YEAR: 2021     DOI: 10.1051/0004-6361/202040180

Sun: corona; Sun: rotation; Solar wind; Astrophysics - Solar and Stellar Astrophysics

ORFEES - a radio spectrograph for the study of solar radio bursts and space weather applications

Radio bursts are sensitive tracers of non-thermal electron populations in the solar corona. They are produced by electron beams and shock waves propagating through the corona and the heliosphere, and by trapped electron populations in coronal mass ejections (CMEs) and in quiescent active regions. Combining space-borne and ground-based radio spectrographs allows one to track disturbances between the low corona, near or at the sites of particle acceleration, and the spacecraft. Radio observations are, therefore, a significant ...

Hamini, Abdallah; Auxepaules, Gabriel; ee, Lionel; Kenfack, Guy; Kerdraon, Alain; Klein, Karl-Ludwig; Lespagnol, Patrice; Masson, Sophie; Coutouly, Lucile; Fabrice, Christian; Romagnan, Renaud;

Published by: Journal of Space Weather and Space Climate      Published on: oct

YEAR: 2021     DOI: 10.1051/swsc/2021039

Parker Data Used; Astronomical instrumentation; methods and techniques; Sun: activity; Sun: corona; Sun: coronal mass ejections (CMEs); Sun: radio radiation

Measurement of the open magnetic flux in the inner heliosphere down to 0.13 AU

Context. Robustly interpreting sets of in situ spacecraft data of the heliospheric magnetic field (HMF) for the purpose of probing the total unsigned magnetic flux in the heliosphere is critical for constraining global coronal models as well as understanding the large scale structure of the heliosphere itself. The heliospheric flux (\ensuremath\Phi$_H$) is expected to be a spatially conserved quantity with a possible secular dependence on the solar cycle and equal to the measured radial component of the HMF weighted by the s ...

Badman, Samuel; Bale, Stuart; Rouillard, Alexis; Bowen, Trevor; Bonnell, John; Goetz, Keith; Harvey, Peter; MacDowall, Robert; Malaspina, David; Pulupa, Marc;

Published by: \aap      Published on: jun

YEAR: 2021     DOI: 10.1051/0004-6361/202039407

Parker Data Used; Sun: corona; Sun: magnetic fields; Sun: heliosphere; Solar wind; methods: data analysis; methods: statistical; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics

The active region source of a type III radio storm observed by Parker Solar Probe during encounter 2

Context. We investigated the source of a type III radio burst storm during encounter 2 of NASA s Parker Solar Probe (PSP) mission.
Aims: It was observed that in encounter 2 of NASA s PSP mission there was a large amount of radio activity and, in particular, a noise storm of frequent, small type III bursts from 31 March to 6 April 2019. Our aim is to investigate the source of these small and frequent bursts.
Methods: In order to do this, we analysed data from the Hinode EUV Imaging Spectrometer, PSP FIELDS, and ...

Harra, L.; Brooks, D.; Bale, S.; Mandrini, C.; Barczynski, K.; Sharma, R.; Badman, S.; Domínguez, Vargas; Pulupa, M.;

Published by: Astronomy and Astrophysics      Published on: 06/2021

YEAR: 2021     DOI: 10.1051/0004-6361/202039514

Sun: corona; Solar wind; Sun: radio radiation; Sun: abundances; Sun: atmosphere; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics; Parker Data Used

Periodicities in an active region correlated with Type III radio bursts observed by Parker Solar Probe

Context. Periodicities have frequently been reported across many wavelengths in the solar corona. Correlated periods of ~5 min, comparable to solar p-modes, are suggestive of coupling between the photosphere and the corona.
Aims: Our study investigates whether there are correlations in the periodic behavior of Type III radio bursts which are indicative of nonthermal electron acceleration processes, and coronal extreme ultraviolet (EUV) emission used to assess heating and cooling in an active region when there are no l ...

Cattell, Cynthia; Glesener, Lindsay; Leiran, Benjamin; Dombeck, John; Goetz, Keith; Oliveros, Juan; Badman, Samuel; Pulupa, Marc; Bale, Stuart;

Published by: Astronomy and Astrophysics      Published on: 06/2021

YEAR: 2021     DOI: 10.1051/0004-6361/202039510

Sun: radio radiation; Sun: corona; Sun: X-rays; gamma rays; Sun: oscillations; magnetic reconnection; radiation mechanisms: non-thermal; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics; Parker Data Used

Using Parker Solar Probe observations during the first four perihelia to constrain global magnetohydrodynamic models

Context. Parker Solar Probe (PSP) is providing an unprecedented view of the Sun s corona as it progressively dips closer into the solar atmosphere with each solar encounter. Each set of observations provides a unique opportunity to test and constrain global models of the solar corona and inner heliosphere and, in turn, use the model results to provide a global context for interpreting such observations.
Aims: In this study, we develop a set of global magnetohydrodynamic (MHD) model solutions of varying degrees of soph ...

Riley, Pete; Lionello, Roberto; Caplan, Ronald; Downs, Cooper; Linker, Jon; Badman, Samuel; Stevens, Michael;

Published by: Astronomy and Astrophysics      Published on: 06/2021

YEAR: 2021     DOI: 10.1051/0004-6361/202039815

Sun: corona; Sun: heliosphere; Sun: magnetic fields; Solar wind; Sun: evolution; Interplanetary medium; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics; Parker Data Used

2020

Understanding the origins of the heliosphere: integrating observations and measurements from Parker Solar Probe, Solar Orbiter, and other space- and ground-based observatories

Context. The launch of\ Parker\ Solar\ Probe\ (PSP) in 2018, followed by\ Solar\ Orbiter (SO) in February 2020, has opened a new window in the exploration of\ solar\ magnetic activity and the origin of the heliosphere. These missions, together with other space observatories dedicated to\ solar\ observations, such as the\ Solar\ Dynamics Observatory, Hinode, IRIS, STEREO, and SOHO, with complementary in situ observations from WIND and ACE, and ground based multi-w ...

Velli, M.; Harra, L.; Vourlidas, A.; Schwadron, N.; Panasenco, O.; Liewer, P.; Müller, D.; Zouganelis, I.; St Cyr, O.; Gilbert, H.; Nieves-Chinchilla, T.; Auchère, F.; Berghmans, D.; Fludra, A.; Horbury, T.; Howard, R.; Krucker, S.; Maksimovic, M.; Owen, C.; iguez-Pacheco, Rodr\; Romoli, M.; Solanki, S.; Wimmer-Schweingruber, R.; Bale, S.; Kasper, J.; McComas, D.; Raouafi, N.; Martinez-Pillet, V.; Walsh, A.; De Groof, A.; Williams, D.;

Published by: Astronomy \& Astrophysics      Published on: 09/2020

YEAR: 2020     DOI: 10.1051/0004-6361/202038245

Parker Data Used; parker solar probe; Solar Probe Plus; Solar wind; solar-terrestrial relations; Sun: atmosphere; Sun: corona; Sun: heliosphere; Sun: magnetic fields

Highly Alfv\ enic slow solar wind at 0.3 au during a solar minimum: Helios insights for Parker Solar Probe and Solar Orbiter

Alfv\ enic fluctuations in solar wind are an intrinsic property of fast streams, while slow intervals typically have a very low degree of Alfv\ enicity, with much more variable parameters. However, sometimes a slow wind can be highly Alfv\ enic. Here we compare three different regimes of solar wind, in terms of Alfv\ enic content and spectral properties, during a minimum phase of the solar activity and at 0.3 au. We show that fast and Alfv\ enic slow intervals share some common characteristics. This would suggest a simila ...

Perrone, D.; D\textquoterightAmicis, R.; De Marco, R.; Matteini, L.; Stansby, D.; Bruno, R.; Horbury, T.;

Published by: Astronomy \& Astrophysics      Published on: 01/2020

YEAR: 2020     DOI: 10.1051/0004-6361/201937064

parker solar probe; plasmas; Solar Probe Plus; Solar wind; Sun: corona; Sun: heliosphere; turbulence

2019

Self-induced Scattering of Strahl Electrons in the Solar Wind

We investigate the scattering of strahl electrons by microinstabilities as a mechanism for creating the electron halo in the solar wind. We develop a mathematical framework for the description of electron-driven microinstabilities and discuss the associated physical mechanisms. We find that an instability of the oblique fast-magnetosonic/whistler (FM/W) mode is the best candidate for a microinstability that scatters strahl electrons into the halo. We derive approximate analytic expressions for the FM/W instability thresho ...

Verscharen, Daniel; Chandran, Benjamin; Jeong, Seong-Yeop; Salem, Chadi; Pulupa, Marc; Bale, Stuart;

Published by: The Astrophysical Journal      Published on: 12/2019

YEAR: 2019     DOI: 10.3847/1538-4357/ab4c30

Astrophysics - Solar and Stellar Astrophysics; instabilities; parker solar probe; Physics - Geophysics; Physics - Plasma Physics; Physics - Space Physics; plasmas; Solar Probe Plus; Solar wind; Sun: corona; turbulence; waves

Magnetic Field Line Twisting by Photospheric Vortices: Energy Storage and Release

Rappazzo, A.~F.; Velli, M.; Dahlburg, R.~B.; Einaudi, G.;

Published by: \apj      Published on: 10/2019

YEAR: 2019     DOI: 10.3847/1538-4357/ab3c69

Parker Data Used; magnetohydrodynamics: MHD; Sun: corona; Sun: coronal mass ejections: CMEs; Astrophysics - Solar and Stellar Astrophysics

Thermodynamics of pure fast solar wind: radial evolution of the temperature\textendashspeed relationship in the inner heliosphereABSTRACT

A strong correlation between speed and proton temperature has been observed, across many years, on hourly averaged measurements in the solar wind. Here, we show that this relationship is also observed at a smaller scale on intervals of a few days, within a single stream. Following the radial evolution of a well-defined stream of coronal-hole plasma, we show that the temperature-speed (T-V) relationship evolves with distance, implying that the T-V relationship at 1 au cannot be used as a proxy for that near the Sun. We sug ...

Perrone, Denise; Stansby, D; Horbury, T; Matteini, L;

Published by: Monthly Notices of the Royal Astronomical Society      Published on: 09/2019

YEAR: 2019     DOI: 10.1093/mnras/stz1877

parker solar probe; Solar Probe Plus; Solar wind; Sun: corona; Sun: heliosphere

Predicting the Structure of the Solar Corona and Inner Heliosphere during Parker Solar Probe \textquoterights First Perihelion Pass

NASA\textquoterights Parker Solar Probe (PSP) spacecraft reached its first perihelion of 35.7 solar radii on 2018 November 5. To aid in mission planning, and in anticipation of the unprecedented measurements to be returned, in late October, we developed a three-dimensional magnetohydrodynamic (MHD) solution for the solar corona and inner heliosphere, driven by the then available observations of the Sun\textquoterights photospheric magnetic field. Our model incorporates a wave-turbulence-driven model to heat the corona. He ...

Riley, Pete; Downs, Cooper; Linker, Jon; Mikic, Zoran; Lionello, Roberto; Caplan, Ronald;

Published by: The Astrophysical Journal      Published on: 04/2019

YEAR: 2019     DOI: 10.3847/2041-8213/ab0ec3

Astrophysics - Solar and Stellar Astrophysics; magnetohydrodynamics: MHD; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus; Solar wind; Sun: corona; Sun: heliosphere; Sun: magnetic fields; waves

Combined geometrical modelling and white-light mass determination of coronal mass ejections

Pluta, Adam; Mrotzek, Niclas; Vourlidas, Angelos; Bothmer, Volker; Savani, Neel;

Published by: \aap      Published on: 03/2019

YEAR: 2019     DOI: 10.1051/0004-6361/201833829

Parker Data Used; Sun: coronal mass ejections (CMEs); solar-terrestrial relations; Sun: heliosphere; Sun: corona

Large-scale Magnetic Funnels in the Solar Corona

Panasenco, Olga; Velli, Marco; Panasenco, Aram;

Published by: \apj      Published on: 03/2019

YEAR: 2019     DOI: 10.3847/1538-4357/ab017c

Parker Data Used; Solar wind; Sun: activity; Sun: corona; Sun: coronal mass ejections: CMEs; Sun: filaments; prominences; Sun: magnetic fields

Contextual Predictions for the Parker Solar Probe . I. Critical Surfaces and Regions

The solar corona and young solar wind may be characterized by critical surfaces\textemdashthe sonic, Alfv\ en, and first plasma-β unity surfaces\textemdashthat demarcate regions where the solar wind flow undergoes certain crucial transformations. Global numerical simulations and remote sensing observations offer a natural mode for the study of these surfaces at large scales, thus providing valuable context for the high-resolution in situ measurements expected from the recently launched Parker Solar Probe (PSP). The prese ...

Chhiber, Rohit; Usmanov, Arcadi; Matthaeus, William; Goldstein, Melvyn;

Published by: The Astrophysical Journal Supplement Series      Published on: 03/2019

YEAR: 2019     DOI: 10.3847/1538-4365/ab0652

Astrophysics - Solar and Stellar Astrophysics; magnetohydrodynamics: MHD; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus; Solar wind; Sun: corona; turbulence

Dissipation Scale Lengths of Solar Wind Turbulence

Raja, Sasikumar; Subramanian, Prasad; Ingale, Madhusudan; Ramesh, R.;

Published by: \apj      Published on: 02/2019

YEAR: 2019     DOI: 10.3847/1538-4357/aafd33

occultations; scattering; Solar wind; Sun: corona; turbulence; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Physics - Space Physics

2018

Dependence of Coronal Loop Temperature on Loop Length and Magnetic Field Strength

Dahlburg, R.~B.; Einaudi, G.; Ugarte-Urra, I.; Rappazzo, A.~F.; Velli, M.;

Published by: \apj      Published on: 12/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aae535

Parker Data Used; magnetohydrodynamics: MHD; Sun: activity; Sun: corona; turbulence

Magnetic Helicity Reversal in the Corona at Small Plasma Beta

Solar and stellar dynamos shed small-scale and large-scale magnetic helicity of opposite signs. However, solar wind observations and simulations have shown that some distance above the dynamo both the small-scale and large-scale magnetic helicities have reversed signs. With realistic simulations of the solar corona above an active region now being available, we have access to the magnetic field and current density along coronal loops. We show that a sign reversal in the horizontal averages of the magnetic helicity occurs ...

Bourdin, Philippe; Singh, Nishant; Brandenburg, Axel;

Published by: The Astrophysical Journal      Published on: 12/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aae97a

Astrophysics - Solar and Stellar Astrophysics; dynamo; magnetohydrodynamics: MHD; methods: numerical; parker solar probe; Physics - Plasma Physics; Solar Probe Plus; Solar wind; Sun: corona; Sun: magnetic fields

Prospective White-light Imaging and In Situ Measurements of Quiescent Large-scale Solar-wind Streams from the Parker Solar Probe and Solar Orbiter

Deep-space exploration of the inner heliosphere is in an unprecedented golden age, with the recent and forthcoming launches of the Parker Solar Probe (PSP) and Solar Orbiter (SolO) missions, respectively. In order to both predict and understand the prospective observations by PSP and SolO, we perform forward MHD modeling of the 3D inner heliosphere at solar minimum, and synthesize the white-light (WL) emission that would result from Thomson scattering of sunlight from the coronal and heliospheric plasmas. Both solar rotat ...

Xiong, Ming; Davies, Jackie; Feng, Xueshang; Li, Bo; Yang, Liping; Xia, Lidong; Harrison, Richard; Hayashi, Keiji; Li, Huichao; Zhou, Yufen;

Published by: The Astrophysical Journal      Published on: 12/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aae978

magnetohydrodynamics: MHD; methods: numerical; Parker Data Used; parker solar probe; Solar Probe Plus; Solar wind; Sun: corona; Sun: heliosphere

Generation of Inverted Heliospheric Magnetic Flux by Coronal Loop Opening and Slow Solar Wind Release

In situ spacecraft observations provide much-needed constraints on theories of solar wind formation and release, particularly the highly variable slow solar wind, which dominates near-Earth space. Previous studies have shown an association between local inversions in the heliospheric magnetic field (HMF) and solar wind released from the vicinity of magnetically closed coronal structures. We here show that in situ properties of inverted HMF are consistent with the same hot coronal source regions as the slow solar wind. We ...

Owens, Mathew; Lockwood, Mike; Barnard, Luke; Macneil, Allan;

Published by: The Astrophysical Journal      Published on: 11/2018

YEAR: 2018     DOI: 10.3847/2041-8213/aaee82

parker solar probe; Solar Probe Plus; Solar wind; Sun: activity; Sun: corona; Sun: magnetic fields

Spatial Expansion and Speeds of Type III Electron Beam Sources in the Solar Corona

A component of space weather, electron beams are routinely accelerated in the solar atmosphere and propagate through interplanetary space. Electron beams interact with Langmuir waves resulting in type III radio bursts. They expand along the trajectory and, using kinetic simulations, we explore the expansion as the electrons propagate away from the Sun. Specifically, we investigate the front, peak, and back of the electron beam in space from derived radio brightness temperatures of fundamental type III emission. The front ...

Reid, Hamish; Kontar, Eduard;

Published by: The Astrophysical Journal      Published on: 11/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aae5d4

Astrophysics - Solar and Stellar Astrophysics; parker solar probe; Solar Probe Plus; Solar wind; Sun: corona; Sun: flares; Sun: particle emission; Sun: radio radiation

Simulated Encounters of the Parker Solar Probe with a Coronal-hole Jet

Solar coronal jets are small, transient, collimated ejections most easily observed in coronal holes (CHs). The upcoming Parker Solar Probe (PSP) mission provides the first opportunity to encounter CH jets in situ near the Sun and examine their internal structure and dynamics. Using projected mission orbital parameters, we have simulated PSP encounters with a fully three-dimensional magnetohydrodynamic (MHD) model of a CH jet. We find that three internal jet regions, featuring different wave modes and levels of compressibi ...

Roberts, Merrill; Uritsky, Vadim; DeVore, Richard; Karpen, Judith;

Published by: The Astrophysical Journal      Published on: 10/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aadb41

Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Solar Probe Plus; Solar wind; Sun: activity; Sun: corona; Sun: heliosphere; Sun: magnetic fields

The Steady Global Corona and Solar Wind: A Three-dimensional MHD Simulation with Turbulence Transport and Heating

Usmanov, Arcadi; Matthaeus, William; Goldstein, Melvyn; Chhiber, Rohit;

Published by: \apj      Published on: 09/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aad687

Parker Data Used; magnetohydrodynamics: MHD; methods: numerical; Solar wind; Sun: corona; Sun: rotation; turbulence

Characterization of the White-light Brightness of the F-corona between 5\textdegree and 24\textdegree Elongation

Stenborg, Guillermo; Howard, Russell; Stauffer, Johnathan;

Published by: \apj      Published on: 08/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aacea3

Parker Data Used; methods: data analysis; scattering; Sun: corona; techniques: image processing; zodiacal dust

Short, large-amplitude speed enhancements in the near-Sunfast solar wind

We report the presence of intermittent, short discrete enhancements in plasma speed in the near-Sun high-speed solar wind. Lasting tens of seconds to minutes in spacecraft measurements at 0.3 au, speeds inside these enhancements can reach 1000 km s-1, corresponding to a kinetic energy up to twice that of the bulk high-speed solar wind. These events, which occur around 5 per cent of the time, are Alfv\ enic in nature with large magnetic field deflections and are the same temperature as the surrounding plasma, in ...

Horbury, T; Matteini, L; Stansby, D;

Published by: Monthly Notices of the Royal Astronomical Society      Published on: 08/2018

YEAR: 2018     DOI: 10.1093/mnras/sty953

parker solar probe; Solar Probe Plus; Solar wind; Sun: corona

Weakened Magnetization and Onset of Large-scale Turbulence in the Young Solar Wind\textemdashComparisons of Remote Sensing Observations with Simulation

Chhiber, Rohit; Usmanov, Arcadi; DeForest, Craig; Matthaeus, William; Parashar, Tulasi; Goldstein, Melvyn;

Published by: \apjl      Published on: 04/2018

YEAR: 2018     DOI: 10.3847/2041-8213/aab843

Parker Data Used; magnetohydrodynamics: MHD; Solar wind; Sun: corona; turbulence

Radial evolution of the solar wind in pure high-speed streams: HELIOS revised observations

Spacecraft observations have shown that the proton temperature in the solar wind falls off with radial distance more slowly than expected for an adiabatic prediction. Usually, previous studies have been focused on the evolution of the solar-wind plasma by using the bulk speed as an order parameter to discriminate different regimes. In contrast, here, we study the radial evolution of pure and homogeneous fast streams (i.e. well-defined streams of coronal-hole plasma that maintain their identity during several solar rotatio ...

Perrone, Denise; Stansby, D; Horbury, T; Matteini, L;

Published by: Monthly Notices of the Royal Astronomical Society      Published on: 03/2019

YEAR: 2018     DOI: 10.1093/mnras/sty3348

parker solar probe; Physics - Plasma Physics; Physics - Space Physics; Solar Probe Plus; Solar wind; Sun: corona; Sun: heliosphere

Solar-wind predictions for the Parker Solar Probe Orbit

Context. The Parker Solar Probe (PSP; formerly Solar Probe Plus) mission will be humanitys first in situ exploration of the solar corona with closest perihelia at 9.86 solar radii (R) distance to the Sun. It will help answer hitherto unresolved questions on the heating of the solar corona and the source and acceleration of the solar wind and solar energetic particles. The scope of this study is to model the solar-wind environment for PSPs unprecedented distances in its prime mission phase during the years 20 ...

Venzmer, M.; Bothmer, V.;

Published by: Astronomy \& Astrophysics      Published on: 03/2018

YEAR: 2018     DOI: 10.1051/0004-6361/201731831

Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus; Solar wind; Sun: corona; Sun: heliosphere

Spectroscopic Measurements of the Ion Velocity Distribution at the Base of the Fast Solar Wind

In situ measurements of the fast solar wind reveal non-thermal distributions of electrons, protons, and minor ions extending from 0.3 au to the heliopause. The physical mechanisms responsible for these non-thermal properties and the location where these properties originate remain open questions. Here, we present spectroscopic evidence, from extreme ultraviolet spectroscopy, that the velocity distribution functions (VDFs) of minor ions are already non-Gaussian at the base of the fast solar wind in a coronal hole, at altit ...

Jeffrey, Natasha; Hahn, Michael; Savin, Daniel; Fletcher, Lyndsay;

Published by: The Astrophysical Journal      Published on: 03/2018

YEAR: 2018     DOI: 10.3847/2041-8213/aab08c

Astrophysics - Solar and Stellar Astrophysics; line: profiles; parker solar probe; Solar Probe Plus; Solar wind; Sun: corona; Sun: heliosphere; Sun: UV radiation; techniques: spectroscopic

2017

The Acceleration of High-energy Protons at Coronal Shocks: The Effect of Large-scale Streamer-like Magnetic Field Structures

Recent observations have shown that coronal shocks driven by coronal mass ejections can develop and accelerate particles within several solar radii in large solar energetic particle (SEP) events. Motivated by this, we present an SEP acceleration study that including the process in which a fast shock propagates through a streamer-like magnetic field with both closed and open field lines in the low corona region. The acceleration of protons is modeled by numerically solving the Parker transport equation with spatial diffusi ...

Kong, Xiangliang; Guo, Fan; Giacalone, Joe; Li, Hui; Chen, Yao;

Published by: The Astrophysical Journal      Published on: 12/2017

YEAR: 2017     DOI: 10.3847/1538-4357/aa97d7

acceleration of particles; Astrophysics - Solar and Stellar Astrophysics; parker solar probe; Physics; shock waves; Solar Probe Plus; Sun: corona; Sun: coronal mass ejections: CMEs; Sun: magnetic fields; Sun: particle emission

A Zone of Preferential Ion Heating Extends Tens of Solar Radii from the Sun

The extreme temperatures and nonthermal nature of the solar corona and solar wind arise from an unidentified physical mechanism that preferentially heats certain ion species relative to others. Spectroscopic indicators of unequal temperatures commence within a fraction of a solar radius above the surface of the Sun, but the outer reach of this mechanism has yet to be determined. Here we present an empirical procedure for combining interplanetary solar wind measurements and a modeled energy equation including Coulomb relax ...

Kasper, J.; Klein, K.; Weber, T.; Maksimovic, M.; Zaslavsky, A.; Bale, S.; Maruca, B.; Stevens, M.; Case, A.;

Published by: The Astrophysical Journal      Published on: 11/2017

YEAR: 2017     DOI: 10.3847/1538-4357/aa84b1

acceleration of particles; Astrophysics - Solar and Stellar Astrophysics; magnetic fields; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; plasmas; Solar Probe Plus; Solar wind; Sun: corona; turbulence

The Evolution of the Surface of Symmetry of the Interplanetary Dust from 24\textdegree to 5\textdegree Elongation

Stenborg, Guillermo; Howard, Russell;

Published by: \apj      Published on: 10/2017

YEAR: 2017     DOI: 10.3847/1538-4357/aa8ef0

Parker Data Used; methods: data analysis; Sun: corona; techniques: image processing

Coronal Heating Topology: The Interplay of Current Sheets and Magnetic Field Lines

Rappazzo, A.~F.; Matthaeus, W.~H.; Ruffolo, D.; Velli, M.; Servidio, S.;

Published by: \apj      Published on: 07/2017

YEAR: 2017     DOI: 10.3847/1538-4357/aa79f2

Parker Data Used; magnetohydrodynamics: MHD; Solar wind; Sun: activity; Sun: corona; Sun: magnetic fields; turbulence; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Physics - Space Physics

A Heuristic Approach to Remove the Background Intensity on White-light Solar Images. I. STEREO /HI-1 Heliospheric Images

White-light coronal and heliospheric imagers observe scattering of photospheric light from both dust particles (the F-Corona) and free electrons in the corona (the K-corona). The separation of the two coronae is thus vitally important to reveal the faint K-coronal structures (e.g., streamers, co-rotating interaction regions, coronal mass ejections, etc.). However, the separation of the two coronae is very difficult, so we are content in defining a background corona that contains the F- and as little K- as possible. For bo ...

Stenborg, Guillermo; Howard, Russell;

Published by: The Astrophysical Journal      Published on: 04/2017

YEAR: 2017     DOI: 10.3847/1538-4357/aa6a12

methods: data analysis; parker solar probe; Solar Probe Plus; Sun: corona; Sun: coronal mass ejections: CMEs; techniques: image processing

Reconnection-Driven Coronal-Hole Jets with Gravity and Solar Wind

Karpen, J.~T.; DeVore, C.~R.; Antiochos, S.~K.; Pariat, E.;

Published by: \apj      Published on: 01/2017

YEAR: 2017     DOI: 10.3847/1538-4357/834/1/62

Parker Data Used; magnetic reconnection; magnetohydrodynamics: MHD; Solar wind; stars: jets; Sun: activity; Sun: corona; Astrophysics - Solar and Stellar Astrophysics

2016

Closed-field Coronal Heating Driven by Wave Turbulence

Downs, Cooper; Lionello, Roberto; c, Zoran; Linker, Jon; Velli, Marco;

Published by: \apj      Published on: 12/2016

YEAR: 2016     DOI: 10.3847/0004-637X/832/2/180

Parker Data Used; magnetohydrodynamics: MHD; Sun: corona; Sun: magnetic fields; turbulence; Astrophysics - Solar and Stellar Astrophysics

Fading Coronal Structure and the Onset of Turbulence in the Young Solar Wind

DeForest, C.~E.; Matthaeus, W.~H.; Viall, N.~M.; Cranmer, S.~R.;

Published by: \apj      Published on: 09/2016

YEAR: 2016     DOI: 10.3847/0004-637X/828/2/66

Parker Data Used; Solar wind; Sun: corona; Sun: fundamental parameters; techniques: image processing; Astrophysics - Solar and Stellar Astrophysics

Inward Motions in the Outer Solar Corona between 7 and 12 R $_☉$: Evidence for Waves or Magnetic Reconnection Jets?

Tenerani, Anna; Velli, Marco; DeForest, Craig;

Published by: \apjl      Published on: 07/2016

YEAR: 2016     DOI: 10.3847/2041-8205/825/1/L3

Parker Data Used; magnetic reconnection; magnetohydrodynamics: MHD; Solar wind; Sun: corona; waves

2015

North-south asymmetry in the magnetic deflection of polar coronal hole jets

o, Nistic\; Zimbardo, G.; Patsourakos, S.; Bothmer, V.; Nakariakov, V.~M.;

Published by: \aap      Published on: 11/2015

YEAR: 2015     DOI: 10.1051/0004-6361/201525731

Parker Data Used; Sun: corona; Sun: magnetic fields; methods: observational; Astrophysics - Solar and Stellar Astrophysics

Magnetic Reconnection: Recursive Current Sheet Collapse Triggered by \textquotedblleftIdeal\textquotedblright Tearing

Tenerani, Anna; Velli, Marco; Rappazzo, Antonio; Pucci, Fulvia;

Published by: \apjl      Published on: 11/2015

YEAR: 2015     DOI: 10.1088/2041-8205/813/2/L32

Parker Data Used; magnetic reconnection; magnetohydrodynamics: MHD; Sun: corona; Physics - Plasma Physics

3D ELECTRON DENSITY DISTRIBUTIONS IN THE SOLAR CORONA DURING SOLAR MINIMA: ASSESSMENT FOR MORE REALISTIC SOLAR WIND MODELING

Knowledge of the electron density distribution in the solar corona put constraints on the magnetic field configurations for coronal modeling and on initial conditions for solar wind modeling. We work with polarized SOHO/LASCO-C2 images from the last two recent minima of solar activity (1996-1997 and 2008-2010), devoid of coronal mass ejections. The goals are to derive the 4D electron density distributions in the corona by applying a newly developed time-dependent tomographic reconstruction method and to compare the result ...

de Patoul, Judith; Foullon, Claire; Riley, Pete;

Published by: The Astrophysical Journal      Published on: 11/2015

YEAR: 2015     DOI: 10.1088/0004-637X/814/1/68

Astrophysics - Solar and Stellar Astrophysics; parker solar probe; Solar Probe Plus; Solar wind; Sun: corona; Sun: evolution; Sun: fundamental parameters; Sun: rotation

KINETIC EVOLUTION OF CORONAL HOLE PROTONS BY IMBALANCED ION-CYCLOTRON WAVES: IMPLICATIONS FOR MEASUREMENTS BY SOLAR PROBE PLUS

We extend the kinetic guiding-center model of collisionless coronal hole protons presented in Isenberg \& Vasquez to consider driving by imbalanced spectra of obliquely propagating ion-cyclotron waves. These waves are assumed to be a small by-product of the imbalanced turbulent cascade to high perpendicular wavenumber, and their total intensity is taken to be 1\% of the total fluctuation energy. We also extend the kinetic solutions for the proton distribution function in the resulting fast solar wind to heliocentric d ...

Isenberg, Philip; Vasquez, Bernard;

Published by: The Astrophysical Journal      Published on: 08/2015

YEAR: 2015     DOI: 10.1088/0004-637X/808/2/119

parker solar probe; plasmas; Solar Probe Plus; Solar wind; Sun: corona; turbulence; waves

Intermittency and Alignment in Strong RMHD Turbulence

Chandran, B.~D.~G.; Schekochihin, A.~A.; Mallet, A.;

Published by: \apj      Published on: 07/2015

YEAR: 2015     DOI: 10.1088/0004-637X/807/1/39

Parker Data Used; magnetohydrodynamics: MHD; plasmas; Solar wind; Sun: chromosphere; Sun: corona; turbulence; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics

A MODIFIED VERSION OF TAYLOR\textquoterightS HYPOTHESIS FOR SOLAR PROBE PLUS OBSERVATIONS

The Solar Probe Plus (SPP) spacecraft will explore the near-Sun environment, reaching heliocentric distances less than 10 R. Near Earth, spacecraft measurements of fluctuating velocities and magnetic fields taken in the time domain are translated into information about the spatial structure of the solar wind via Taylor\textquoterights \textquotedblleftfrozen turbulence\textquotedblright hypothesis. Near the perihelion of SPP, however, the solar-wind speed is comparable to the Alfv\ en speed, and Taylor\text ...

Klein, Kristopher; Perez, Jean; Verscharen, Daniel; Mallet, Alfred; Chandran, Benjamin;

Published by: The Astrophysical Journal      Published on: 03/2015

YEAR: 2015     DOI: 10.1088/2041-8205/801/1/L18

Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; plasmas; Solar Probe Plus; Solar wind; Sun: corona; turbulence

2014

Dissipation and Reconnection in Boundary-driven Reduced Magnetohydrodynamics

Wan, Minping; Rappazzo, Antonio; Matthaeus, William; Servidio, Sergio; Oughton, Sean;

Published by: \apj      Published on: 12/2014

YEAR: 2014     DOI: 10.1088/0004-637X/797/1/63

Parker Data Used; magnetic reconnection; magnetohydrodynamics: MHD; Sun: corona

DYNAMICS OF DOUBLE LAYERS, ION ACCELERATION, AND HEAT FLUX SUPPRESSION DURING SOLAR FLARES

Observations of flare-heated electrons in the corona typically suggest confinement of electrons. The confinement mechanism, however, remains unclear. The transport of coronal hot electrons into ambient plasma was recently investigated by particle-in-cell (PIC) simulations. Electron transport was significantly suppressed by the formation of a highly localized, nonlinear electrostatic potential in the form of a double layer (DL). In this work large-scale PIC simulations are performed to explore the dynamics of DLs in larger ...

Li, T.; Drake, J.; Swisdak, M.;

Published by: The Astrophysical Journal      Published on: 09/2014

YEAR: 2014     DOI: 10.1088/0004-637X/793/1/7

acceleration of particles; Astrophysics - Solar and Stellar Astrophysics; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; Solar Probe Plus; Solar wind; Sun: corona; Sun: flares

Nonlinear and Linear Timescales near Kinetic Scales in Solar Wind Turbulence

Matthaeus, W.~H.; Oughton, S.; Osman, K.~T.; Servidio, S.; Wan, M.; Gary, S.~P.; Shay, M.~A.; Valentini, F.; Roytershteyn, V.; Karimabadi, H.; Chapman, S.~C.;

Published by: \apj      Published on: 08/2014

YEAR: 2014     DOI: 10.1088/0004-637X/790/2/155

Parker Data Used; magnetohydrodynamics: MHD; Solar wind; Sun: corona; turbulence; Physics - Space Physics; Physics - Plasma Physics

Role of Transients in the Sustainability of Solar Coronal Plumes

Raouafi, N.; Stenborg, G.;

Published by: \apj      Published on: 06/2014

YEAR: 2014     DOI: 10.1088/0004-637X/787/2/118

Parker Data Used; plasmas; Sun: activity; Sun: corona; Sun: magnetic fields; Sun: UV radiation



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