Parker Solar Probe Observations of Solar Wind Energetic Proton Beams Produced by Magnetic Reconnection in the Near-Sun Heliospheric Current Sheet

被引：19

作者：

Phan, T. D. ^{[1
]}

Verniero, J. L. ^{[2
]}

Larson, D. ^{[1
]}

Lavraud, B. ^{[3
,4
]}

Drake, J. F. ^{[5
]}

Oieroset, M. ^{[1
]}

Eastwood, J. P. ^{[6
]}

Bale, S. D. ^{[1
,7
]}

Livi, R. ^{[1
]}

Halekas, J. S. ^{[8
]}

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

Rahmati, A. ^{[1
]}

Stansby, D. ^{[9
]}

Pulupa, M. ^{[1
]}

MacDowall, R. J. ^{[2
]}

Szabo, P. A. ^{[2
]}

Koval, A. ^{[2
,10
]}

Desai, M. ^{[11
]}

Fuselier, S. A. ^{[11
]}

Velli, M. ^{[12
]}

Hesse, M. ^{[13
]}

Pyakurel, P. S. ^{[1
]}

Maheshwari, K. ^{[1
]}

Kasper, J. C. ^{[14
]}

Stevens, J. M. ^{[15
]}

Case, A. W. ^{[15
]}

Raouafi, N. E. ^{[16
]}

机构：

[1] Univ Calif Berkeley, SSL, Berkeley, CA 94720 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[3] Univ Bordeaux, Lab Astrophys Bordeaux, Pessac, France

[4] Univ Toulouse, CNES, CNRS, IRAP, Toulouse, France

[5] Univ Maryland, College Pk, MD 20742 USA

[6] Imperial Coll London, Blackett Lab, London, England

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

[8] Univ Iowa, Iowa City, IA USA

[9] Univ Coll London, Mullard Space Sci Lab, Dorking, Surrey, England

[10] Univ Maryland, Baltimore, MD 21201 USA

[11] Southwest Res Inst, San Antonio, TX USA

[12] Univ Calif Los Angeles, Los Angeles, CA USA

[13] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

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

[15] Smithsonian Astrophys Observ, Cambridge, MA USA

[16] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 09期

关键词：

magnetic reconnection; particle acceleration; solar wind; parker solar probe; heliospheric current sheet; EARTHS MAGNETOPAUSE DEPENDENCE; INFLOW ALFVEN SPEED; X-LINE; SWITCHBACKS; PARTICLES; ELECTRONS; EXHAUSTS;

D O I：

10.1029/2021GL096986

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report observations of reconnection exhausts in the Heliospheric Current Sheet (HCS) during Parker Solar Probe Encounters 08 and 07, at 16 R-s and 20 R-s, respectively. Heliospheric current sheet (HCS) reconnection accelerated protons to almost twice the solar wind speed and increased the proton core energy by a factor of similar to 3, due to the Alfven speed being comparable to the solar wind flow speed at these near-Sun distances. Furthermore, protons were energized to super-thermal energies. During E08, energized protons were found to have leaked out of the exhaust along separatrix field lines, appearing as field-aligned energetic proton beams in a broad region outside the HCS. Concurrent dropouts of strahl electrons, indicating disconnection from the Sun, provide further evidence for the HCS being the source of the beams. Around the HCS in E07, there were also proton beams but without electron strahl dropouts, indicating that their origin was not the local HCS reconnection exhaust.

引用

页数：12

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