Global Occurrences of Auroral Kilometric Radiation Related to Suprathermal Electrons in Radiation Belts

TitleGlobal Occurrences of Auroral Kilometric Radiation Related to Suprathermal Electrons in Radiation Belts
Publication TypeJournal Article
Year of Publication2019
AuthorsZhao, W, Liu, S, Zhang, S, Zhou, Q, Yang, C, He, Y, Gao, Z, Xiao, F
JournalGeophysical Research Letters
Date Published07/2019
ISSN0094-8276
KeywordsAuroral kilometric radiation; global occurrence; Radiation belt; suprathermal electron flux enhancenments; Van Allen Probes
AbstractAuroral kilometric radiation (AKR) can potentially produce serious damage to space‐borne systems by accelerating trapped radiation belt electrons to relativistic energies. Here we examine the global occurrences of AKR emissions in radiation belts based on Van Allen Probes observations from 1 October 2012 to 31 December 2016. The statistical results (1,848 events in total) show that AKR covers a broad region of L= 3–6.5 and 00–24 magnetic local time (MLT), with a higher occurrence on the nightside (20–24 MLT and 00–04 MLT) within L= 5–6.5. All the AKR events are observed to be accompanied with suprathermal (∼1 keV) electron flux enhancements. During active geomagnetic periods, both AKR occurrences and electron injections tend to be more distinct, and AKR emission extends to the dayside. The current study shows that AKR emissions from the remote sources are closely associated with electron injections.
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019GL083944
DOI10.1029/2019GL083944
Short TitleGeophys. Res. Lett.


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