Parker Solar Probe Observations of Proton Beams Simultaneous with Ion-scale Waves

被引：78

作者：

Verniero, J. L. ^{[1
]}

Larson, D. E. ^{[1
]}

Livi, R. ^{[1
]}

Rahmati, A. ^{[1
]}

McManus, M. D. ^{[1
,2
]}

Pyakurel, P. Sharma ^{[1
]}

Klein, K. G. ^{[3
]}

Bowen, T. A. ^{[1
]}

Bonnell, J. W. ^{[1
]}

Alterman, B. L. ^{[4
,5
]}

Whittlesey, P. L. ^{[1
]}

Malaspina, David M. ^{[6
,7
]}

Bale, S. D. ^{[1
,2
,8
,9
]}

Kasper, J. C. ^{[4
,10
]}

Case, A. W. ^{[10
]}

Goetz, K. ^{[11
]}

Harvey, P. R. ^{[1
]}

Korreck, K. E. ^{[10
]}

MacDowall, R. J. ^{[12
]}

Pulupa, M. ^{[1
]}

Stevens, M. L. ^{[10
]}

de Wit, T. Dudok ^{[13
,14
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA

[3] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[4] Univ Michigan, Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA

[5] Southwest Res Inst, Space Sci & Engn, San Antonio, TX 78238 USA

[6] Univ Colorado, Astrophys & Planetary Sci Dept, Boulder, CO 80309 USA

[7] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA

[8] Imperial Coll London, Blackett Lab, London SW7 2AZ, England

[9] Queen Mary Univ London, Sch Phys & Astron, London E1 4NS, England

[10] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA

[11] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[12] NASA, Goddard Space Flight Ctr, Code 695, Greenbelt, MD 20771 USA

[13] CNRS, LPC2E, Orleans, France

[14] Univ Orleans, Orleans, France

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2020年 / 248卷 / 01期

关键词：

Solar wind; Space plasmas; Plasma physics; Alfven waves; AMPLITUDE ALFVEN WAVES; CYCLOTRON WAVES; WIND PROTONS; ELECTROMAGNETIC-WAVES; PLASMA PARAMETERS; MINOR IONS; INSTABILITIES; ACCELERATION; STABILITY; EQUATORIAL;

D O I：

10.3847/1538-4365/ab86af

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 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 second 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 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.

引用

页数：18

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