Observations of the 2019 April 4 Solar Energetic Particle Event at the Parker Solar Probe

被引：30

作者：

Leske, R. A. ^{[1
]}

Christian, E. R. ^{[2
]}

Cohen, C. M. S. ^{[1
]}

Cummings, A. C. ^{[1
]}

Davis, A. J. ^{[1
]}

Desai, M. I. ^{[3
]}

Giacalone, J. ^{[4
]}

Hill, M. E. ^{[5
]}

Joyce, C. J. ^{[6
]}

Krimigis, S. M. ^{[5
]}

Labrador, A. W. ^{[1
]}

Malandraki, O. ^{[7
]}

Matthaeus, W. H. ^{[8
]}

McComas, D. J. ^{[6
]}

McNutt, R. L., Jr. ^{[5
]}

Mewaldt, R. A. ^{[1
]}

Mitchell, D. G. ^{[5
]}

Posner, A. ^{[9
]}

Rankin, J. S. ^{[6
]}

Roelof, E. C. ^{[5
]}

Schwadron, N. A. ^{[10
]}

Stone, E. C. ^{[1
]}

Szalay, J. R. ^{[6
]}

Wiedenbeck, M. E. ^{[11
]}

Vourlidas, A. ^{[5
]}

Bale, S. D. ^{[12
,13
,14
,15
]}

MacDowall, R. J. ^{[16
]}

Pulupa, M. ^{[3
,13
]}

Kasper, J. C. ^{[17
,18
]}

Allen, R. C. ^{[5
]}

Case, A. W. ^{[18
]}

Korreck, K. E. ^{[18
]}

Livi, R. ^{[19
]}

Stevens, M. L. ^{[18
]}

Whittlesey, P. ^{[19
]}

Poduval, B. ^{[10
]}

机构：

[1] CALTECH, Pasadena, CA 91125 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Southwest Res Inst, San Antonio, TX 78228 USA

[4] Univ Arizona, Tucson, AZ 85721 USA

[5] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[6] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08540 USA

[7] Natl Observ Athens, IAASARS, Athens 15236, Greece

[8] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[9] NASA HQ, Washington, DC 20024 USA

[10] Univ New Hampshire, Durham, NH 03824 USA

[11] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

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

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

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

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

[16] NASA, Goddard Space Flight Ctr, Solar Syst Explorat Div, Greenbelt, MD 20771 USA

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

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

[19] Univ Calif Berkeley, Berkeley, CA 94720 USA

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2020年 / 246卷 / 02期

关键词：

HELIUM ABUNDANCE; LARGE-ANGLE; ACCELERATION; MISSION; SURGES; CORONA;

D O I：

10.3847/1538-4365/ab5712

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A solar energetic particle event was detected by the Integrated Science Investigation of the Sun (IS circle dot IS) instrument suite on Parker Solar Probe (PSP) on 2019 April 4 when the spacecraft was inside of 0.17 au and less than 1 day before its second perihelion, providing an opportunity to study solar particle acceleration and transport unprecedentedly close to the source. The event was very small, with peak 1 MeV proton intensities of similar to 0.3 particles (cm(2) sr s MeV)(-1), and was undetectable above background levels at energies above 10 MeV or in particle detectors at 1 au. It was strongly anisotropic, with intensities flowing outward from the Sun up to 30 times greater than those flowing inward persisting throughout the event. Temporal association between particle increases and small brightness surges in the extreme-ultraviolet observed by the Solar TErrestrial RElations Observatory, which were also accompanied by type III radio emission seen by the Electromagnetic Fields Investigation on PSP, indicates that the source of this event was an active region nearly 80 degrees east of the nominal PSP magnetic footpoint. This suggests that the field lines expanded over a wide longitudinal range between the active region in the photosphere and the corona.

引用

页数：10

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