Whistler-Mode Wave Normal Angle Shift and the Related Pitch Angle Distribution of Electrons During Dipolarization
學年 111
學期 2
發表日期 2023-05-21
作品名稱 Whistler-Mode Wave Normal Angle Shift and the Related Pitch Angle Distribution of Electrons During Dipolarization
作品名稱（其他語言）
著者 Kaiti Wang; Fumiko Otsuka; Tohru Hada; Ching-Huei Lin
作品所屬單位
出版者
會議名稱 Japan Geoscience Union Meeting 2023
會議地點 日本, 千葉
摘要 A peculiar wave event was recorded in the whistler frequency range at around a few hundred Hz, at a dipolarization site near the magnetic equator, about 10 Earth radii tailside. The THEMIS mission observed this wave event during an intense decrease in the auroral electrojet index (AL). The wave event is unique, with a shift in the wave normal angle from nearly 160o to 20o, right after the dipolarization angle reaches its maximum. The effect of pitch angle scattering on electrons through cyclotron and Landau resonances via this wave event is investigated by performing test particle simulations incorporating the observed wave amplitudes and wave normal angles. The results showed that the primary scattering could occur at nearly 0 and 180 degrees for electrons around 10 keV, similar to the observed changes in electron pitch angle distributions of a similar energy. We will present the observations and computations and show that a wave event with shifted wave normal angles can cause changes in pitch angle distributions in different directions with respect to the ambient magnetic field.
關鍵字 whistler-mode waves;wave normal angle shift ;pitch angle distribution;dipolarization at tailside
語言 en
收錄於
會議性質 國際
校內研討會地點 無
研討會時間 20230521~20230526
通訊作者 Kaiti Wang
國別 JPN
公開徵稿
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出處
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/124141 )