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The Pitch-angle Distributions of Suprathermal Ions near an Interplanetary Shock
Alternative TitleWOS:000520425400001
Yang, Liu; Berger, Lars; Wimmer-Schweingruber, Robert F.; Wang, Linghua; Yu, Jia1; Galvin, Antoinette B.; Mobius, Eberhard3
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2020
Volume888Issue:2Pages:L22
DOI10.3847/2041-8213/ab629d
ISSN2041-8205
Language英语
KeywordInterplanetary particle acceleration Interplanetary shocks Solar wind Corotating streams SOLAR-WIND ENERGETIC PARTICLES ACCELERATION PROTONS PIONEER-10 UPSTREAM EVENTS PLASMA
AbstractWe present a case study of the pitch-angle distributions (PADs) of suprathermal H+, He2+ at similar to 10-40 keV/nuc and He+ at similar to 8-20 keV/nuc near a reverse shock of a stream interaction region observed by the Plasma and Suprathermal Ion Composition instrument on board the Solar Terrestrial Relations Observatory Ahead spacecraft on 2008 March 9. We find that in both the downstream and upstream region close to the shock, the shocked particles of all three species appear to have a power-law-like spectrum at these suprathermal energies. The PADs of these three species show very similar behavior: in the downstream region, the phase space density appears to be significantly higher in the direction perpendicular to the interplanetary magnetic field (IMF) than in the parallel direction, along which particles accelerated at the shock front are supposed to escape into the downstream region. In the upstream region, the PADs of all three species show a clear beam in the direction antiparallel to the IMF due to the escaping particles from the shock into the upstream region. In addition, we find that suprathermal He+ shows a signature of bidirectional beams in the upstream region very close to the shock. These results suggest that H+, He2+ at similar to 10-40 keV/nuc and He+ at similar to 8-20 keV/nuc could be accelerated similarly at interplanetary shocks and that shock drift acceleration likely plays an important role in the in situ acceleration of low-energy suprathermal ions.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7640
Collection中国科学院国家空间科学中心
Affiliation1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
2.Univ Kiel, Inst Expt & Appl Phys, Leibnizstr 11, D-24118 Kiel, Germany
3.Wimmer-Schweingruber, Robert F.] Natl Space Sci Ctr, Beijing 100190, Peoples R China
4.Univ New Hampshire, Inst Study Earth Oceans & Space, SSC Morse Hall, Durham, NH 03824 USA
Recommended Citation
GB/T 7714
Yang, Liu,Berger, Lars,Wimmer-Schweingruber, Robert F.,et al. The Pitch-angle Distributions of Suprathermal Ions near an Interplanetary Shock[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,888(2):L22.
APA Yang, Liu.,Berger, Lars.,Wimmer-Schweingruber, Robert F..,Wang, Linghua.,Yu, Jia.,...&Mobius, Eberhard.(2020).The Pitch-angle Distributions of Suprathermal Ions near an Interplanetary Shock.ASTROPHYSICAL JOURNAL LETTERS,888(2),L22.
MLA Yang, Liu,et al."The Pitch-angle Distributions of Suprathermal Ions near an Interplanetary Shock".ASTROPHYSICAL JOURNAL LETTERS 888.2(2020):L22.
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