Parker Solar Probe Observations of Proton Beams Simultaneous with Ion-scale Waves
| Autor: | Robert J. MacDowall, Phyllis Whittlesey, Justin C. Kasper, Keith Goetz, Stuart D. Bale, J. L. Verniero, Peter Harvey, P. Sharma Pyakurel, Roberto Livi, Benjamin L. Alterman, Trevor A. Bowen, David M. Malaspina, Marc Pulupa, Anthony W. Case, Davin Larson, Michael L. Stevens, Ali Rahmati, John W. Bonnell, M. McManus, T. Dudok de Wit, Katja Klein, Kelly E. Korreck |
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| Přispěvatelé: | University of California [Berkeley], University of California, Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Electromagnetic field
010504 meteorology & atmospheric sciences Proton Solar wind FOS: Physical sciences Electron 01 natural sciences Plasma physics Physics - Space Physics 0103 physical sciences Alfven waves 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Wave power Physics [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Astronomy and Astrophysics Plasma Space Physics (physics.space-ph) Computational physics Alfvén waves Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Physics::Space Physics Orbit (dynamics) Space plasmas Heliosphere |
| Zdroj: | Astrophysical Journal Supplement Astrophysical Journal Supplement, American Astronomical Society, 2020, 248 (1), pp.5. ⟨10.3847/1538-4365/ab86af⟩ |
| ISSN: | 0067-0049 1538-4365 |
| DOI: | 10.3847/1538-4365/ab86af⟩ |
| Popis: | Parker Solar Probe (PSP), NASA's latest and closest mission to the Sun, is on a journey to investigate fundamental enigmas of the inner heliosphere. This paper reports initial observations made by the Solar Probe Analyzer for Ions (SPAN-I), one of the instruments in the Solar Wind Electrons Alphas and Protons (SWEAP) instrument suite. We address the presence of secondary proton beams in concert with ion-scale waves observed by FIELDS, the electromagnetic fields instrument suite. We show two events from PSP's 2nd orbit that demonstrate signatures consistent with wave-particle interactions. We showcase 3D velocity distribution functions (VDFs) measured by SPAN-I during times of strong wave power at ion-scales. From an initial instability analysis, we infer that the VDFs departed far enough away from local thermodynamic equilibrium (LTE) to provide sufficient free energy to locally generate waves. These events exemplify the types of instabilities that may be present and, as such, may guide future data analysis characterizing and distinguishing between different wave-particle interactions. Comment: 24 pages, 9 figures, 2 tables |
| Databáze: | OpenAIRE |
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