PSP Bibliography





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Found 206 entries in the Bibliography.


Showing entries from 101 through 150


2019

Ion Cyclotron Waves in Field-aligned Solar Wind Turbulence

Telloni, Daniele; Carbone, Francesco; Bruno, Roberto; Zank, Gary; Sorriso-Valvo, Luca; Mancuso, Salvatore;

Published by: \apjl      Published on: 11/2019

YEAR: 2019     DOI: 10.3847/2041-8213/ab4c44

Parker Data Used; Magnetohydrodynamics; Space plasmas; Solar wind; interplanetary turbulence; Alfven waves; 1964; 1544; 1534; 830; 23

The Long-standing Closure Crisis in Coronal Plasmas

Coronal and solar wind physics have long used plasma fluid models to motivate physical explanations of observations; the hypothesized model is introduced into a fluid simulation to see if observations are reproduced. This procedure is called Verification of Mechanism (VoM) modeling; it is contingent on the self consistency of the closure that made the simulation possible. Inner corona VoMs typically assume weak gradient Spitzer-Braginskii closures. Four prominent coronal VoMs in place for decades are shown to contradict t ...

Scudder, J.;

Published by: The Astrophysical Journal      Published on: 11/2019

YEAR: 2019     DOI: 10.3847/1538-4357/ab48e0

Astrophysical fluid dynamics; parker solar probe; Solar corona; Solar coronal heating; Solar Probe Plus; Solar wind

Multiple-point Modeling the Parker Spiral Configuration of the Solar Wind Magnetic Field at the Solar Maximum of Solar Cycle 24

By assuming that the solar wind flow is spherically symmetric and that the flow speed becomes constant beyond some critical distance r = R 0 (neglecting solar gravitation and acceleration by high coronal temperature), the large-scale solar wind magnetic field lines are distorted into a Parker spiral configuration, which is usually simplified to an Archimedes spiral. Using magnetic field observations near Mercury, Venus, and Earth during solar maximum of Solar Cycle 24, we statistically surveyed the Parker spira ...

Chang, Qing; Xu, Xiaojun; Xu, Qi; Zhong, Jun; Xu, Jiaying; Wang, Jing; Zhang, Tielong;

Published by: The Astrophysical Journal      Published on: 10/2019

YEAR: 2019     DOI: 10.3847/1538-4357/ab412a

parker solar probe; planets and satellites: magnetic fields; Solar Probe Plus; Solar wind; Sun: activity; Sun: magnetic fields

Reynolds Number and Intermittency in the Expanding Solar Wind: Predictions Based on Voyager Observations

The large-scale features of the solar wind are examined in order to predict small-scale features of turbulence in unexplored regions of the heliosphere. The strategy is to examine how system size, or effective Reynolds number Re, varies, and then how this quantity influences observable statistical properties, including intermittency properties of solar wind turbulence. The expectation based on similar hydrodynamics scalings is that the kurtosis, of the small-scale magnetic field increments, will increase with increasing R ...

Parashar, T.; Cuesta, M.; Matthaeus, W.;

Published by: The Astrophysical Journal      Published on: 10/2019

YEAR: 2019     DOI: 10.3847/2041-8213/ab4a82

Heliosphere; interplanetary turbulence; parker solar probe; Physics - Space Physics; Plasma astrophysics; Solar Probe Plus; Solar wind; Space plasmas

Temperature Fluctuation at the Sun and Large-scale Electric Field in Solar Wind: A Challenge for the Parker Solar Probe Mission

Velocity distributions of particles are key elements in the study of solar wind. The physical mechanisms that regulate their many features are a matter of debate. The present work addresses the subject with a fully analytical method in order to establish the shape of particle velocity distributions in solar wind. The method consists of solving the steady-state kinetic equation for particles and the related fluid equations, with spatial profiles for density and temperature that match general observational data. The model i ...

Pavan, J.; Vi\~nas, A.;

Published by: The Astrophysical Journal      Published on: 09/2019

YEAR: 2019     DOI: 10.3847/1538-4357/ab2fcd

Interplanetary particle acceleration; Kappa mechanism; Parallel field; parker solar probe; Solar coronal transients; Solar Probe Plus; Solar wind

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

On the Fast Solar Wind Heating and Acceleration Processes: A Statistical Study Based on the UVCS Survey Data

The UltraViolet Coronagraph Spectrometer (UVCS) on board the SOlar and Heliospheric Observatory has almost continuously observed, throughout the whole solar cycle 23, the UV solar corona. This work addresses the first-ever statistical analysis of the daily UVCS observations, performed in the O VI channel, of the northern polar coronal hole, between 1.5 and 3 R , during the period of low solar activity from 1996 April to 1997 December. The study is based on the investigation, at different heights, of the corr ...

Telloni, Daniele; Giordano, Silvio; Antonucci, Ester;

Published by: The Astrophysical Journal      Published on: 08/2019

YEAR: 2019     DOI: 10.3847/2041-8213/ab3731

parker solar probe; Solar corona; Solar coronal heating; Solar Probe Plus; Solar wind; The Sun

Single-spacecraft Identification of Flux Tubes and Current Sheets in the Solar Wind

A novel technique is presented for describing and visualizing the local topology of the magnetic field using single-spacecraft data in the solar wind. The approach merges two established techniques: the Grad-Shafranov (GS) reconstruction method, which provides a plausible regional two-dimensional magnetic field surrounding the spacecraft trajectory, and the Partial Variance of Increments (PVI) technique that identifies coherent magnetic structures, such as current sheets. When applied to one month of Wind magnetic field d ...

Pecora, Francesco; Greco, Antonella; Hu, Qiang; Servidio, Sergio; Chasapis, Alexandros; Matthaeus, William;

Published by: The Astrophysical Journal      Published on: 08/2019

YEAR: 2019     DOI: 10.3847/2041-8213/ab32d9

interplanetary turbulence; magnetic fields; parker solar probe; Solar Probe Plus; Solar wind

Electron Energy Partition across Interplanetary Shocks. I. Methodology and Data Product

Wilson, Lynn; Chen, Li-Jen; Wang, Shan; Schwartz, Steven; Turner, Drew; Stevens, Michael; Kasper, Justin; Osmane, Adnane; Caprioli, Damiano; Bale, Stuart; Pulupa, Marc; Salem, Chadi; Goodrich, Katherine;

Published by: \apjs      Published on: 07/2019

YEAR: 2019     DOI: 10.3847/1538-4365/ab22bd

Parker Data Used; methods: numerical; methods: statistical; plasmas; shock waves; Solar wind; Sun: coronal mass ejections: CMEs; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics

Nonlinear Evolution of Ion Kinetic Instabilities in the Solar Wind

Ofman, Leon;

Published by: \solphys      Published on: 07/2019

YEAR: 2019     DOI: 10.1007/s11207-019-1440-8

Solar wind; theory: numerical modeling; instabilities; waves; plasma; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics

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

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

Whistler Fan Instability Driven by Strahl Electrons in the Solar Wind

Vasko, I.~Y.; Krasnoselskikh, V.; Tong, Y.; Bale, S.~D.; Bonnell, J.~W.; Mozer, F.~S.;

Published by: \apjl      Published on: 02/2019

YEAR: 2019     DOI: 10.3847/2041-8213/ab01bd

Parker Data Used; conduction; instabilities; plasmas; scattering; Solar wind; waves

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

Inherentness of Non-stationarity in Solar Wind

Jagarlamudi, Vamsee; de Wit, Thierry; Krasnoselskikh, Vladimir; Maksimovic, Milan;

Published by: \apj      Published on: 01/2019

YEAR: 2019     DOI: 10.3847/1538-4357/aaef2e

Parker Data Used; magnetic fields; Solar wind; turbulence

2018

On slow solar wind with high Alfv\ enicity: from composition and microphysics to spectral properties

Alfv\ enic fluctuations are very common features in the solar wind and are found especially within the main portion of fast-wind streams while the slow wind usually is less Alfv\ enic and more variable. In general, the fast and slow winds show many differences, which span from the large-scale structure to small-scale phenomena, including also a different turbulent behaviour. Recent studies, however, have shown that even the slow wind can sometimes be highly Alfv\ enic, with fluctuations as large as those of the fast wind. ...

D’Amicis, Raffaella; Matteini, Lorenzo; Bruno, Roberto;

Published by: Monthly Notices of the Royal Astronomical Society      Published on: 3/2019

YEAR: 2018     DOI: 10.1093/mnras/sty3329

Astrophysics - Solar and Stellar Astrophysics; methods: data analysis; parker solar probe; Physics - Data Analysis; Physics - Plasma Physics; Physics - Space Physics; Solar Probe Plus; Solar wind; Statistics and Probability; turbulence

Higher-Order Turbulence Statistics in the Earth s Magnetosheath and the Solar Wind Using Magnetospheric Multiscale Observations

Chhiber, R.; Chasapis, A.; Bandyopadhyay, R.; Parashar, T.~N.; Matthaeus, W.~H.; Maruca, B.~A.; Moore, T.~E.; Burch, J.~L.; Torbert, R.~B.; Russell, C.~T.; Le Contel, O.; Argall, M.~R.; Fischer, D.; Mirioni, L.; Strangeway, R.~J.; Pollock, C.~J.; Giles, B.~L.; Gershman, D.~J.;

Published by: Journal of Geophysical Research (Space Physics)      Published on: 12/2018

YEAR: 2018     DOI: 10.1029/2018JA025768

Parker Data Used; Solar wind; magnetosheath; turbulence; plasma turbulence; intermittency; multispacecraft technique

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

Nonlinear Firehose Relaxation and Constant-B Field Fluctuations

Tenerani, Anna; Velli, Marco;

Published by: \apjl      Published on: 11/2018

YEAR: 2018     DOI: 10.3847/2041-8213/aaec01

Parker Data Used; instabilities; plasmas; Solar wind; waves; Physics - Plasma Physics

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

A New Inner Heliosphere Proton Parameter Dataset from the Helios Mission

In the near future, Parker Solar Probe and Solar Orbiter will provide the first comprehensive in-situ measurements of the solar wind in the inner heliosphere since the Helios mission in the 1970s. We describe a reprocessing of the original Helios ion distribution functions to provide reliable and reproducible data to characterise the proton core population of the solar wind in the inner heliosphere. A systematic fitting of bi-Maxwellian distribution functions was performed to the raw Helios ion distribution function data ...

Stansby, David; Salem, Chadi; Matteini, Lorenzo; Horbury, Timothy;

Published by: Solar Physics      Published on: 11/2018

YEAR: 2018     DOI: 10.1007/s11207-018-1377-3

Astrophysics - Solar and Stellar Astrophysics; Heliosphere; Inner heliosphere; parker solar probe; Physics - Space Physics; Solar Probe Plus; Solar wind; Solar wind protons

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

Incompressive Energy Transfer in the Earth\textquoterights Magnetosheath: Magnetospheric Multiscale Observations

Bandyopadhyay, Riddhi; Chasapis, A.; Chhiber, R.; Parashar, T.~N.; Matthaeus, W.~H.; Shay, M.~A.; Maruca, B.~A.; Burch, J.~L.; Moore, T.~E.; Pollock, C.~J.; Giles, B.~L.; Paterson, W.~R.; Dorelli, J.; Gershman, D.~J.; Torbert, R.~B.; Russell, C.~T.; Strangeway, R.~J.;

Published by: \apj      Published on: 10/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aade04

Parker Data Used; magnetohydrodynamics: MHD; planets and satellites: magnetic fields; plasmas; Solar wind; turbulence; Physics - Space Physics

Solar Wind Turbulence Studies Using MMS Fast Plasma Investigation Data

Bandyopadhyay, Riddhi; Chasapis, A.; Chhiber, R.; Parashar, T.~N.; Maruca, B.~A.; Matthaeus, W.~H.; Schwartz, S.~J.; Eriksson, S.; Le Contel, O.; Breuillard, H.; Burch, J.~L.; Moore, T.~E.; Pollock, C.~J.; Giles, B.~L.; Paterson, W.~R.; Dorelli, J.; Gershman, D.~J.; Torbert, R.~B.; Russell, C.~T.; Strangeway, R.~J.;

Published by: \apj      Published on: 10/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aade93

Parker Data Used; magnetohydrodynamics: MHD; methods: data analysis; methods: statistical; plasmas; Solar wind; turbulence; Physics - Space Physics

Parametric Decay and the Origin of the Low-frequency Alfv\ enic Spectrum of the Solar Wind

The fast solar wind shows a wide spectrum of transverse magnetic and velocity field perturbations. These perturbations are strongly correlated in the sense of Alfv\ en waves propagating mostly outward, from the Sun to the interplanetary medium. They are likely to be fundamental to the acceleration and the heating of the solar wind. However, the precise origin of the broadband spectrum is unknown to date. Typical periods of chromospheric Alfv\ en waves are limited to a few minutes, and any longer period perturbations shoul ...

Réville, Victor; Tenerani, Anna; Velli, Marco;

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

YEAR: 2018     DOI: 10.3847/1538-4357/aadb8f

instabilities; magnetohydrodynamics: MHD; methods: numerical; parker solar probe; Solar Probe Plus; Solar wind; waves

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

Dependence of Kinetic Plasma Turbulence on Plasma \ensuremath\beta

Parashar, Tulasi; Matthaeus, William; Shay, Michael;

Published by: \apjl      Published on: 09/2018

YEAR: 2018     DOI: 10.3847/2041-8213/aadb8b

Parker Data Used; plasmas; Solar wind; turbulence; Physics - Space Physics; Astrophysics - Astrophysics of Galaxies; Physics - Plasma Physics

Self-consistent Energetic Particle Acceleration by Contracting and Reconnecting Small-scale Flux Ropes: The Governing Equations

le Roux, J.~A.; Zank, G.~P.; Khabarova, O.~V.;

Published by: \apj      Published on: 09/2018

YEAR: 2018     DOI: 10.3847/1538-4357/aad8b3

Parker Data Used; acceleration of particles; magnetic reconnection; Solar wind

Oscillations of cometary tails: a vortex shedding phenomenon?

o, Nistic\; Vladimirov, V.; Nakariakov, V.~M.; Battams, K.; Bothmer, V.;

Published by: \aap      Published on: 08/2018

YEAR: 2018     DOI: 10.1051/0004-6361/201732474

Parker Data Used; Solar wind; comets: individual: Encke; ISON; magnetohydrodynamics (MHD); methods: observational; instabilities; waves; Astrophysics - Earth and Planetary Astrophysics

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

Investigating the Effect of IMF Path Length on Pitch-angle Scattering of Strahl within 1 au

Strahl is the strongly field-aligned, beam-like population of electrons in the solar wind. Strahl width is observed to increase with distance from the Sun, and hence strahl electrons must be subject to in-transit scattering effects. Different energy relations have been both observed and modeled for both strahl width and the width increase with radial distance. Thus, there is much debate regarding what mechanism(s) scatter strahl. In this study, we use a novel method to investigate strahl evolution within 1 au by estimatin ...

Graham, G.; Rae, I.; Owen, C.; Walsh, A.;

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

YEAR: 2018     DOI: 10.3847/1538-4357/aaaf1b

parker solar probe; plasmas; scattering; Solar Probe Plus; Solar wind; 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

Diagnosing solar wind origins using in situ measurements in the inner heliosphere

Robustly identifying the solar sources of individual packets of solar wind measured in interplanetary space remains an open problem. We set out to see if this problem is easier to tackle using solar wind measurements closer to the Sun than 1 au, where the mixing and dynamical interaction of different solar wind streams is reduced. Using measurements from the Helios mission, we examined how the proton core temperature anisotropy and cross-helicity varied with distance. At 0.3 au there are two clearly separated anisotropic ...

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

Published by: Monthly Notices of the Royal Astronomical Society      Published on: 01/2019

YEAR: 2018     DOI: 10.1093/mnras/sty2814

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

The Use of the Expanded FMEA in Spacecraft Fault Management

The NASA/APL Parker Solar Probe (PSP) mission will revolutionize our understanding of the Sun by swooping to within 4 million miles of the Sun s surface. This mission targets the fundamental processes and dynamics that characterize the Sun s corona and outwardly expanding solar wind and will be the first mission to fly into the low solar corona (i.e., the Sun s atmosphere) revealing both how the corona is heated and how the solar wind is accelerated. PSP has many engineering challenges presented by the intense environment in ...

Jones, Melissa; Fretz, Kristin; Kubota, Sanae; Smith, Clayton;

Published by: Proceedings - Annual Reliability and Maintainability Symposium      Published on:

YEAR: 2018     DOI:

Failure modes; Fault detection; Human resource management; Maintainability; NASA; Risk analysis; Risk assessment; Safety factor; Solar radiation; Solar wind; Spacecraft; Parker Engineering

2017

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

Future space missions: the inner region of the Solar system

The paper deals with an overview of space missions to explore the inner region of the Solar System, the nearest on time of their launch, namely, Probe Plus, Solar Orbiter, BepiColombo, EXOMars, and InSight. Each of them will study either the Sun or the planet of the Earth group. Their launches are planned for 2018-2020. We describe briefly predestination and technical equipment of spacecrafts, flight plan and scientific goal of these missions.

Vasylenko, A.A.;

Published by: Kosm\ \i\v cna nauka \ \i tehnolog\ \i\^a      Published on: 10/2017

YEAR: 2017     DOI: 10.15407/knit10.15407/knit2017.0310.15407/knit2017.03.073

Martian atmosphere; Martian surface; Mercury magnetic field; Parker Data Used; parker solar probe; Solar Probe Plus; Solar wind

Quasi-thermal noise spectroscopy: The art and the practice

Quasi-thermal noise spectroscopy is an efficient tool for measuring in situ macroscopic plasma properties in space, using a passive wave receiver at the ports of an electric antenna. This technique was pioneered on spinning spacecraft carrying very long dipole antennas in the interplanetary medium\textemdashlike ISEE-3 and Ulysses\textemdashwhose geometry approached a "theoretician\textquoterights dream." The technique has been extended to other instruments in various types of plasmas on board different spacecraft and wil ...

Meyer-Vernet, N.; Issautier, K.; Moncuquet, M.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 08/2017

YEAR: 2017     DOI: 10.1002/2017JA024449

electric antennas; magnetospheres; parker solar probe; plasma waves; radio receivers; Solar Probe Plus; Solar wind; velocity distributions

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

Evolving Waves and Turbulence in the Outer Corona and Inner Heliosphere: The Accelerating Expanding Box

Tenerani, Anna; Velli, Marco;

Published by: \apj      Published on: 07/2017

YEAR: 2017     DOI: 10.3847/1538-4357/aa71b9

Parker Data Used; magnetohydrodynamics: MHD; methods: numerical; Solar wind; Sun: heliosphere; turbulence; waves; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Physics - Space Physics

Cosmic-Ray Diffusion Coefficients throughout the Inner Heliosphere from a Global Solar Wind Simulation

Chhiber, R.; Subedi, P.; Usmanov, A.~V.; Matthaeus, W.~H.; Ruffolo, D.; Goldstein, M.~L.; Parashar, T.~N.;

Published by: \apjs      Published on: 06/2017

YEAR: 2017     DOI: 10.3847/1538-4365/aa74d2

Parker Data Used; cosmic rays; diffusion; methods: numerical; Solar wind; turbulence; Physics - Space Physics

Turbulent Transport in a Three-dimensional Solar Wind

Shiota, D.; Zank, G.~P.; Adhikari, L.; Hunana, P.; Telloni, D.; Bruno, R.;

Published by: \apj      Published on: 03/2017

YEAR: 2017     DOI: 10.3847/1538-4357/aa60bc

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

Langmuir wave electric fields induced by electron beams in the heliosphere

Solar electron beams responsible for type III radio emission generate Langmuir waves as they propagate out from the Sun. The Langmuir waves are observed via in situ electric field measurements. These Langmuir waves are not smoothly distributed but occur in discrete clumps, commonly attributed to the turbulent nature of the solar wind electron density. Exactly how the density turbulence modulates the Langmuir wave electric fields is understood only qualitatively. Using weak turbulence simulations, we investigate how solar ...

Reid, Hamish; Kontar, Eduard;

Published by: Astronomy \& Astrophysics      Published on: 02/2017

YEAR: 2017     DOI: 10.1051/0004-6361/201629697

Astrophysics - Solar and Stellar Astrophysics; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; Solar Probe Plus; Solar wind; Sun: flares; Sun: heliosphere; Sun: magnetic fields; Sun: particle emission; Sun: radio radiation

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

Revisiting a Classic: The Parker-Moffatt Problem

Pezzi, O.; Parashar, T.~N.; Servidio, S.; Valentini, F.; asconez, C.~L.; Yang, Y.; Malara, F.; Matthaeus, W.~H.; Veltri, P.;

Published by: \apj      Published on: 01/2017

YEAR: 2017     DOI: 10.3847/1538-4357/834/2/166

Parker Data Used; magnetohydrodynamics: MHD; plasmas; Solar wind; Physics - Space Physics



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