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Notice:
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Found 652 entries in the Bibliography.
Showing entries from 351 through 400
| 2019 |
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Charting a course to the sun: Flight path control for parker solar probe The successful launch of the Parker Solar Probe (PSP) on August 12, 2018 with a Delta IV rocket and Star-48BV third stage has placed the spacecraft on a 7-year trajectory to study the Sun. The goals of PSP are to better characterize our solar environment and advance our understanding of the Sun at 9.86 Rs. A total of 42 trajectory correction maneuvers are planned. This paper documents trajectory correction maneuver analysis performed just prior to launch until just past the first solar encounter. The pre-launch analysis culm ... Valerino, Powtawche; Thompson, Paul; Jones, Drew; Goodson, Troy; R., Haw; E., Lau; N., Mottinger; M., Ryne; Published by: Advances in the Astronautical Sciences Published on: |
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Solar Radiation Disturbance Torque Reduction for the Parker Solar Probe Observatory This paper examines the methodology used for reducing solar pressure disturbance torques for the Parker Solar Probe (PSP) Observatory by minimizing the offset between spacecraft s Center of Gravity (CG) and Center of Pressure (CP). The force due to solar radiation pressures encountered by the PSP spacecraft, particularly at the 9.86 solar-radii (Rs) closest approach point in the orbit, are of a sufficient magnitude to produce significant disturbance torques. Inside of 0.25 AU, the Observatory is required to keep its Thermal ... Ruiz, Felipe; Kelly, Daniel; Napolillo, David; Published by: IEEE Aerospace Conference Proceedings Published on: Ballast (railroad track); Flight control systems; Observatories; Optical properties; Orbits; Probes; Propellants; Solar radiation; Spacecraft; Torque; Well testing; Parker Engineering |
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Design, fabrication, test, launch, and early operation of the parker solar probe propulsion system The Parker Solar Probe (PSP) spacecraft, part of NASA’s Living With a Star program, launched on 12 August 2018, atop a Delta IV Heavy launch vehicle with a STAR-48BV upper stage. As NASA’s mission to "touch the Sun," Parker Solar Probe will fly within 3.83 million miles of the Sun and will spend its lifetime studying the gaseous envelope surrounding it: the corona. Over the seven-year mission, PSP will orbit the Sun 24 times and utilize seven Venus fly-bys to gradually shrink its orbit around the Sun. The spacecr ... Kijewski, Seth; Bushman, Stewart; Published by: Published on: Automobile manufacture; Fabrication; Launch vehicles; NASA; Nitrogen compounds; Orbits; Probes; Rockets; Space flight; Stars; Parker Engineering |
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Verification and validation testing for the parker solar probe guidance and control system Parker Solar Probe was launched on a 7-year mission to explore the Sun in August 2018. A successful first orbit was preceded and enabled by a rigorous test campaign prior to launch. This paper discusses two of the main portions of that test program used to characterize and verify the performance of the spacecraft’s guidance and control system. An extensive set of stand-alone simulations was designed to demonstrate compliance with performance requirements and explore system behavior in response to a large set of fault c ... Vaughan, Robin; OShaughnessy, Daniel; Wirzburger, John; Published by: Advances in the Astronautical Sciences Published on: Flight control systems; Flight simulators; Orbits; Probes; Testing; Parker Engineering |
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The NASA Parker Solar Probe and the ESA Solar Orbiter will explore the source region of the solar wind within 20 solar radii. Their unprecedented in-situ measurements are also expected to shed light on the nature of the F-corona and the existence of a halo of nanodust. Such a dust complex might play an important role in the generation of high-speed nanodust grains and the inner-source pickup ions. A brief summary of previous works on this topic is given here to be followed by a sketch on a plan to integrate MHD simulation of ... Ip, Wing-Huen; Lai, Ian-Lin; Shen, Fang; Published by: Published on: YEAR: 2019 DOI: 10.1088/1742-6596/1332/1/012007 |
| 2018 |
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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 |
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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 |
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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 |
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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 |
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In science news around the world, the U.S. National Institutes of Health (NIH) responds to a report on "foreign influences," Australia slashes its future research funding, Mars\textquoterights methane mystery deepens, and the Paris agreement on climate change survives a contentious rulemaking session in Poland. Also, astronomers discover the solar system\textquoterights farthest-known planet, NIH comes under fire for clinical trial reporting results, the late Paul Allen bequests a new immunology research institute, and NA ...
Published by: Science Published on: 12/2018 YEAR: 2018 DOI: 10.1126/science.362.6421.1334 Parker Data Used; parker solar probe; SCI COMMUN; Solar Probe Plus |
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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 |
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Nonlinear Firehose Relaxation and Constant-B Field Fluctuations 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 |
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Evidence for a Circumsolar Dust Ring Near Mercury\textquoterights Orbit To test a technique to be used on the white-light imager onboard the recently launched Parker Solar Probe mission, we performed a numerical differentiation of the brightness profiles along the photometric axis of the F-corona models that are derived from STEREO Ahead Sun Earth Connection Heliospheric Investigation observations recorded with the HI-1 instrument between 2007 December and 2014 March. We found a consistent pattern in the derivatives that can be observed from any S/C longitude between about 18\textdegree and 2 ... Stenborg, Guillermo; Stauffer, Johnathan; Howard, Russell; Published by: The Astrophysical Journal Published on: 11/2018 YEAR: 2018 DOI: 10.3847/1538-4357/aae6cb 169P\&NEAT; 73P\&Schwassmann-Wachmann 3; comets: individual: 2P\&Encke; methods: data analysis; Parker Data Used; parker solar probe; Solar Probe Plus; techniques: image processing; zodiacal dust |
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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 |
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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 |
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Solar corona heating by axion quark nugget dark matter In this work we advocate for the idea that two seemingly unrelated 80-year-old mysteries\textemdashthe nature of dark matter and the high temperature of the million degree solar corona\textemdashmay have resolutions that lie within the same physical framework. The current paradigm is that the corona is heated by nanoflares, which were originally proposed as miniature versions of the observed solar flares. It was recently suggested that the nanoflares could be identified as annihilation events of the nuggets from the axion ... Raza, Nayyer; Van Waerbeke, Ludovic; Zhitnitsky, Ariel; Published by: Physical Review D Published on: 11/2018 YEAR: 2018 DOI: 10.1103/PhysRevD.98.103527 Astrophysics - Cosmology and Nongalactic Astrophysics; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Solar and Stellar Astrophysics; High Energy Physics - Phenomenology; parker solar probe; Solar Probe Plus |
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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 ... 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 |
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Finite Dissipation in Anisotropic Magnetohydrodynamic Turbulence Bandyopadhyay, Riddhi; Oughton, S.; Wan, M.; Matthaeus, W.~H.; Chhiber, R.; Parashar, T.~N.; Published by: Physical Review X Published on: 10/2018 YEAR: 2018 DOI: 10.1103/PhysRevX.8.041052 Parker Data Used; Physics - Plasma Physics; Physics - Fluid Dynamics; Physics - Space Physics |
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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 |
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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 |
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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 |
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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 |
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After 60 years of technological and materials development, in August this year the Parker Solar Probe set off on its journey to skim the atmosphere of the Sun. Mission Scientist Adam Szabo summarizes this ambitious adventure. Published by: NATURE ASTRONOMY Published on: 10/2018 YEAR: 2018 DOI: 10.1038/s41550-018-0580-3 |
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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 |
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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 |
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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 |
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NASA launches Parker Solar Probe mission to \textquoterighttouch\textquoteright the Sun NASA has launched a mission to study the Sun\textquoterights atmosphere and solar wind that will come far closer to our star than any other craft before. Published by: Physics World Published on: 09/2018 YEAR: 2018 DOI: 10.1088/2058-7058/31/9/11 |
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Subresolution activity in solar and stellar coronae from magnetic field line tangling Rappazzo, A.~F.; Dahlburg, R.~B.; Einaudi, G.; Velli, M.; Published by: \mnras Published on: 08/2018 YEAR: 2018 DOI: 10.1093/mnras/sty1132 Parker Data Used; MHD; turbulence; stars: activity; stars: coronae; stars: magnetic field; stars: solar-type; Astrophysics - Solar and Stellar Astrophysics |
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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 |
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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 |
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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 |
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Published by: Science Published on: 08/2018 YEAR: 2018 DOI: 10.1126/science.361.6401.441 |
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Death-defying NASA mission will make humanity\textquoterights closest approach to the Sun The Parker Solar Probe will dive into the sizzling solar corona to explore its mysteries. Published by: Nature Published on: 07/2018 YEAR: 2018 DOI: 10.1038/d41586-018-05741-6 |
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Electromagnetic Thermal Noise in Upper-Hybrid Frequency Range The inner magnetosphere including the radiation belt and ring current environment is replete with high-frequency fluctuations with peak intensity occurring near upper-hybrid frequency and/or multiple harmonic electron cyclotron frequencies above and below the upper-hybrid frequency. Past and contemporary spacecraft missions, including the Van Allen Probes, were designed to detect the electric field spectrum only for these high-frequency fluctuations. Making use of the recently formulated generalized theory of electromagne ... Yoon, Peter; Hwang, Junga; opez, Rodrigo; Kim, Sunjung; Lee, Jaejin; Published by: Journal of Geophysical Research: Space Physics Published on: 07/2018 YEAR: 2018 DOI: 10.1029/2018JA025459 electromagnetic; parker solar probe; Solar Probe Plus; thermal noise; upper hybrid |
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Velocity-space cascade in magnetized plasmas: Numerical simulations Pezzi, O.; Servidio, S.; Perrone, D.; Valentini, F.; Sorriso-Valvo, L.; Greco, A.; Matthaeus, W.~H.; Veltri, P.; Published by: Physics of Plasmas Published on: 06/2018 YEAR: 2018 DOI: 10.1063/1.5027685 |
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Marginal Stability of Sweet-Parker Type Current Sheets at Low Lundquist Numbers Shi, Chen; Velli, Marco; Tenerani, Anna; Published by: \apj Published on: 06/2018 YEAR: 2018 DOI: 10.3847/1538-4357/aabd83 Parker Data Used; magnetic reconnection; magnetohydrodynamics: MHD; Physics - Plasma Physics; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics |
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In this Letter, we present an analysis of two-point, two-time correlation functions from high-resolution numerical simulations of Reflection-driven Alfven Turbulence near the Alfven critical point r e . The simulations model the turbulence in a prescribed background solar wind model chosen to match observational constraints. This analysis allows us to investigate the temporal decorrelation of solar wind turbulence and the validity of Taylor s approximation near the heliocentric distance r(c), which Parker Solar Probe (PSP) i ... Bourouaine, Sofiane; Perez, Jean; Published by: ASTROPHYSICAL JOURNAL LETTERS Published on: 05/2018 YEAR: 2018 DOI: 10.3847/2041-8213/aabccf |
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Single-mode nonlinear Langevin emulation of magnetohydrodynamic turbulence Bandyopadhyay, Riddhi; Matthaeus, William; Parashar, Tulasi; Published by: \pre Published on: 05/2018 YEAR: 2018 DOI: 10.1103/PhysRevE.97.053211 |
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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 |
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Opening a Window on ICME-driven GCR Modulation in the Inner Solar System Interplanetary coronal mass ejections (ICMEs) often cause Forbush decreases (Fds) in the flux of galactic cosmic rays (GCRs). We investigate how a single ICME, launched from the Sun on 2014 February 12, affected GCR fluxes at Mercury, Earth, and Mars. We use GCR observations from MESSENGER at Mercury, ACE/LRO at the Earth/Moon, and MSL at Mars. We find that Fds are steeper and deeper closer to the Sun, and that the magnitude of the magnetic field in the ICME magnetic ejecta as well as the \textquotedblleftstrength\textquo ... Winslow, Reka; Schwadron, Nathan; Lugaz, \; Guo, Jingnan; Joyce, Colin; Jordan, Andrew; Wilson, Jody; Spence, Harlan; Lawrence, David; Wimmer-Schweingruber, Robert; Mays, Leila; Published by: The Astrophysical Journal Published on: 04/2018 YEAR: 2018 DOI: 10.3847/1538-4357/aab098 parker solar probe; Solar Probe Plus; Sun: coronal mass ejections: CMEs; Sun: evolution; Sun: heliosphere |
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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 |
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Onset of fast ideal tearing in thin current sheets: Dependence on the equilibrium current profile Pucci, F.; Velli, M.; Tenerani, A.; Del Sarto, D.; Published by: Physics of Plasmas Published on: 03/2018 YEAR: 2018 DOI: 10.1063/1.5022988 Parker Data Used; Physics - Plasma Physics; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics |
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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 |
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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 ... 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 |
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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 |
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Modeling a Single SEP Event from Multiple Vantage Points Using the iPATH Model Using the recently extended 2D improved Particle Acceleration and Transport in the Heliosphere (iPATH) model, we model an example gradual solar energetic particle event as observed at multiple locations. Protons and ions that are energized via the diffusive shock acceleration mechanism are followed at a 2D coronal mass ejection-driven shock where the shock geometry varies across the shock front. The subsequent transport of energetic particles, including cross-field diffusion, is modeled by a Monte Carlo code that is based ... Hu, Junxiang; Li, Gang; Fu, Shuai; Zank, Gary; Ao, Xianzhi; Published by: The Astrophysical Journal Published on: 02/2018 YEAR: 2018 DOI: 10.3847/2041-8213/aaabc1 parker solar probe; shock waves; Solar Probe Plus; Sun: coronal mass ejections: CMEs; Sun: heliosphere |
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Parametric instability, inverse cascade and the range of solar-wind turbulence In this paper, weak-turbulence theory is used to investigate the nonlinear evolution of the parametric instability in three-dimensional low-β plasmas at wavelengths much greater than the ion inertial length under the assumption that slow magnetosonic waves are strongly damped. It is shown analytically that the parametric instability leads to an inverse cascade of Alfv\ en wave quanta, and several exact solutions to the wave kinetic equations are presented. The main results of the paper concern the parametric decay of Alf ... Published by: Journal of Plasma Physics Published on: 02/2018 YEAR: 2018 DOI: 10.1017/S0022377818000016 astrophysical plasmas; Astrophysics - Solar and Stellar Astrophysics; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; plasma nonlinear phenomena; plasma waves; Solar Probe Plus |
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On the Performance of Multi-Instrument Solar Flare Observations During Solar Cycle 24 The current fleet of space-based solar observatories offers us a wealth of opportunities to study solar flares over a range of wavelengths. Significant advances in our understanding of flare physics often come from coordinated observations between multiple instruments. Consequently, considerable efforts have been, and continue to be, made to coordinate observations among instruments ( e.g. through the Max Millennium Program of Solar Flare Research). However, there has been no study to date that quantifies how many flares ... Milligan, Ryan; Ireland, Jack; Published by: Solar Physics Published on: 02/2018 YEAR: 2018 DOI: 10.1007/s11207-017-1233-x Astrophysics - Solar and Stellar Astrophysics; flares; Instrumentation and data management; parker solar probe; Solar Probe Plus |
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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 |
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Solar wind turbulence within high-speed streams is reviewed from the point of view of embedded single nonlinear Alfv\ en wave cycles, discontinuities, magnetic decreases (MDs), and shocks. For comparison and guidance, cometary plasma turbulence is also briefly reviewed. It is demonstrated that cometary nonlinear magnetosonic waves phase-steepen, with a right-hand circular polarized foreshortened front and an elongated, compressive trailing edge. The former part is a form of "wave breaking" and the latter that of "period d ... Tsurutani, Bruce; Lakhina, Gurbax; Sen, Abhijit; Hellinger, Petr; Glassmeier, Karl-Heinz; Mannucci, Anthony; Published by: Journal of Geophysical Research: Space Physics Published on: 01/2018 YEAR: 2018 DOI: 10.1002/jgra.v123.410.1002/2017JA024203 Alfv\ en waves; discontinuities; interplanetary turbulence; magnetic decreases; parker solar probe; period doubling; Solar Probe Plus; wave phase-steepening |
