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Electron Precipitation Driven by EMIC Waves: Two Types of Energy Dispersionстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Grach Veronika S., Artemyev Anton V., Demekhov Andrei G., Zhang Xiao‐Jia, Bortnik Jacob, Angelopoulos Vassilis
- Журнал: Geophysical Research Letters
- Том: 51
- Номер: 9
- Год издания: 2024
- Издательство: American Geophysical Union
- Местоположение издательства: United States
- Номер статьи: e2023GL107604
- DOI: 10.1029/2023gl107604
- Аннотация: Electromagnetic ion cyclotron (EMIC) waves can very rapidly and effectively scatter relativistic electrons into the atmosphere. EMIC‐driven precipitation bursts can be detected by low‐altitude spacecraft, and analysis of the fine structure of such bursts may reveal unique information about the near‐equatorial EMIC source region. In this study, we report, for the first time, observations of EMIC‐driven electron precipitation exhibiting energy, E, dispersion as a function of latitude (and hence L‐shell): two predominant categories exhibit dE/dL > 0 and dE/dL < 0. We interpret precipitation with dE/dL < 0 as due to the typical inward radial gradient of cold plasma density and equatorial magnetic field (∼65% of the statistics). Precipitation with dE/dL > 0 is interpreted as due to an outward radial gradient of the equatorial magnetic field, likely produced by energetic ions freshly injected into the ring current (∼35% of the statistics). The observed energy dispersion of EMIC‐driven electron precipitation was reproduced in simulations.
- Добавил в систему: Демехов Андрей Геннадьевич