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Quiet-time Solar Wind Suprathermal Electrons of Different Solar Origins
Alternative TitleWOS:000540806300001
Yang, Liu; Wang, Linghua; Zhao, Liang1; Tao, Jiawei; Li, Gang2,3; Wimmer-Schweingruber, Robert F.; He, Jiansen; Tian, Hui; Bale, Stuart D.
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2020
Volume896Issue:1Pages:L5
DOI10.3847/2041-8213/ab9531
ISSN2041-8205
Language英语
KeywordSolar physics Solar particle emission Solar wind SUPERHALO ELECTRONS WHISTLER TURBULENCE PLASMA HALO
AbstractThe energy spectrum of solar wind strahl, halo, and superhalo electrons likely carries crucial information on their possible origin and acceleration at the Sun. Here we statistically investigate the energy spectrum of solar wind strahl/halo electrons at similar to 0.1-1.5 keV and superhalo electrons at similar to 20-200 keV measured by Wind/3D Plasma and Energetic Particle during quiet times from 1998 to 2014, according to the types of their Potential Field Source Surface-mapped coronal source regions (CSRs). We adopt the classification scheme developed by Zhao et al. to categorize the CSRs into four types: active region (AR), quiet Sun (QS), coronal hole (CH), and helmet-streamer associated region (HS). We find that for the quiet-time strahl, the AR and HS (QS and CH) correspond to a smaller (larger) kappa index kappa(strahl) with the most frequent value of 7-8.5 (8.5-10) and a larger (smaller) n(strahl) with the most frequent value of 0.013-0.026 cm(-3) (0.006-0.0013 cm(-3)). For the quiet-time halo, kappa(halo) behaves similarly to kappa(strahl), but n(halo) appears similar among the four CSR types. For the superhalo, the AR (QS) corresponds to a larger (smaller) power-law index beta with the most frequent value of 2.2-2.4 (1.8-2.0), while the HS and CH have a beta not different from either the AR or QS; n(sup) appears similar, with the most frequent value of 3 x 10(-8)-3 x 10(-7) cm(-3), among the four CSR types. These results suggest that the strahl (superhalo) from the hotter CSRs tends to be more (less) efficiently accelerated.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7610
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 Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48105 USA
3.Univ Alabama, Dept Space Sci, Huntsville, AL 35899 USA
4.Univ Alabama, CSPAR, Huntsville, AL 35899 USA
5.Wimmer-Schweingruber, Robert F.] Univ Kiel, Inst Expt & Appl Phys, Leibnizstr 11, D-24118 Kiel, Germany
6.Wimmer-Schweingruber, Robert F.] Natl Space Sci Ctr, Beijing 100190, Peoples R China
7.Bale, Stuart D.] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA
8.Bale, Stuart D.] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
Recommended Citation
GB/T 7714
Yang, Liu,Wang, Linghua,Zhao, Liang,et al. Quiet-time Solar Wind Suprathermal Electrons of Different Solar Origins[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,896(1):L5.
APA Yang, Liu.,Wang, Linghua.,Zhao, Liang.,Tao, Jiawei.,Li, Gang.,...&Bale, Stuart D..(2020).Quiet-time Solar Wind Suprathermal Electrons of Different Solar Origins.ASTROPHYSICAL JOURNAL LETTERS,896(1),L5.
MLA Yang, Liu,et al."Quiet-time Solar Wind Suprathermal Electrons of Different Solar Origins".ASTROPHYSICAL JOURNAL LETTERS 896.1(2020):L5.
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