期刊
GEOPHYSICAL RESEARCH LETTERS
卷 47, 期 21, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL090360
关键词
pulsating aurora; microbursts; wave‐ particle interactions; computer simulation
资金
- JSPS KAKENHI [15H05747, 16H06286, 17H00728, 20H01955, JPJSBP120194814, 20H01959]
- JSPS-CAS bilateral project
- Grants-in-Aid for Scientific Research [17H00728, 20H01955] Funding Source: KAKEN
In this study, by simulating the wave-particle interactions, we show that subrelativistic/relativistic electron microbursts form the high-energy tail of pulsating aurora (PsA). Whistler-mode chorus waves that propagate along the magnetic field lines at high latitudes cause precipitation bursts of electrons with a wide energy range from a few kiloelectron volts (PsA) to several megaelectron volts (relativistic microbursts). The rising tone elements of chorus waves cause individual microbursts of subrelativistic/relativistic electrons and the internal modulation of PsA with a frequency of a few hertz. The chorus bursts for a few seconds cause the microburst trains of subrelativistic/relativistic electrons and the main pulsations of PsA. Our simulation studies demonstrate that both PsA and relativistic electron microbursts originate simultaneously from pitch angle scattering by chorus wave-particle interactions along the field line.
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