Variations of the relativistic electron flux after a magnetospheric compression event

TitleVariations of the relativistic electron flux after a magnetospheric compression event
Publication TypeJournal Article
Year of Publication2017
AuthorsChen, Z, Chen, HF, Li, YF, Xiang, HW, Yu, XQ, Shi, WH, Hao, ZH, Zou, H, Zou, JQ, Zhong, WY
JournalScience China Technological Sciences
Volume60
Issue4
Pagination638 - 647
Date Published04/2017
ISSN1674-7321
Keywordsouter radiation belt high-energy electrons medium-energy electrons space environment; Van Allen Probes
AbstractOn January 21, 2015, a sharp increase of the solar wind dynamic pressure impacted the magnetosphere. The magnetopause moved inward to the region L< 8 without causing a geomagnetic storm. The flux of the relativistic electrons in the outer radiation belt decreased by half during this event based on the observations of the particle radiation monitor (PRM) of the fourth of the China-Brazil Earth Resource Satellites (CBERS-4). The flux remained low for approximately 11 d; it did not recover after a small magnetic storm on January 26 but after a small magnetic storm on February 2. The loss and recovery of the relativistic electrons during this event are investigated using the PRM data, medium- and high-energy electron observations of NOAA-15 and the Van Allen Probes, medium-energy electron observations of GOES-13, and wave observations of the Van Allen Probes. This study shows that the loss of energetic electrons in this event is related to magnetospheric compression. The chorus waves accelerate the medium-energy electrons, which causes the recovery of relativistic electrons. The Van Allen Probes detected strong chorus waves in the region L = 3–6 from January 21 to February 2. However, the flux of medium-energy electrons was low in the region. This implies that the long-lasting lack of recovery of the relativistic electrons after this event is due to the lack of the medium-energy “seed” electrons. The medium-energy electrons in the outer radiation belt may be a clue to predict the recovery of relativistic electrons.
URLhttps://link.springer.com/article/10.1007/s11431-016-9008-3
DOI10.1007/s11431-016-9008-3
Short TitleSci. China Technol. Sci.


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