Energy Spectrum of Solar Energetic Electron Events over 25 Years

Author:

Wang 王 Wen 雯ORCID,Wang 王 Linghua 玲华ORCID,Krucker SämORCID,Wimmer-Schweingruber Robert F.ORCID

Abstract

Abstract We investigate the peak flux energy spectrum of 458 solar energetic electron (SEE) events with a clear velocity dispersion detected at energies from ≤4.2 to ≥108 keV by Wind/3DP from 1994 December through 2019 December, utilizing a pan-spectrum fitting method. According to the fitted spectral parameters, these 458 events are self-consistently classified into five spectral types: 304 downward double-power-law (DDPL) events, 32 upward double-power-law (UDPL) events, 23 single-power-law (SPL) events, 44 Ellison–Ramaty (ER) events, and 55 logarithmic–parabola (LP) events. The DDPL events can be further divided into two types: 231 DDPL E B 20 keV events and 73 DDPL E B < 20 keV events, since their break energy E B exhibits a double-peak distribution separated by a dip at ∼20 keV. The DDPL E B < 20 keV ( DDPL E B 20 keV ) events show a power-law spectral index of 2.0 0.2 + 0.2 ( 2.1 0.3 + 0.3 ) at energies below E B = 5.6 2.4 + 2.3 ( 61 12 + 23 ) keV and an index of 3.3 0.3 + 0.5 ( 3.9 0.7 + 0.6 ) at energies above. The UDPL events have a spectral index of 3.0 0.3 + 0.3 at energies below E B = 5.1 1.8 + 4.2 keV and an index of 2.2 0.3 + 0.2 at energies above. The SPL events exhibit a spectral index of 2.8 0.2 + 0.5 . The ER events show a spectral index of 1.9 0.3 + 0.3 at energies below E c = 31 11 + 19 keV. The LP events are characterized by a spectral slope of 1.8 0.3 + 0.4 ( 3.6 0.5 + 0.7 ) at 2.8 keV (108 keV). The six spectral types also behave differently in the relationship between spectral parameters and in solar cycle variations. The spectral shape of most SEE events appears to be unrelated to the estimated electron path lengths. These results suggest that the formation of SEE events can involve complex processes/sources.

Funder

NSFC

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3