Pitch-angle and energy diffusion of radiation belt electrons by lower-hybrid waves near the geomagnetic equator
學年 104
學期 2
發表日期 2016-06-27
作品名稱 Pitch-angle and energy diffusion of radiation belt electrons by lower-hybrid waves near the geomagnetic equator
作品名稱（其他語言）
著者 Otsuka, F.; Wang, K.; S. Matsukiyo; T. Hada
作品所屬單位
出版者
會議名稱 18th International Congress on Plasma Physics
會議地點 Kaohsiung, Taiwan
摘要 Wave-particle interaction plays an important role for radiation belt electron diffusion in the momentum space. Several different types of waves can contribute to the electron diffusion [1]. Here we focus on the lower-hybrid waves (the so-called ‘equatorial noise’), which are frequently observed near the geomagnetic equator [2, 3]. The lower hybrid waves are in the frequency range between the proton gyrofrequency and the lower-hybrid frequency, and are propagating nearly perpendicular to the background magnetic field with almost linear polarization. In this presentation, we discuss the pitch-angle and energy diffusion of electrons caused by the lower-hybrid waves, performing one-dimensional test particle simulations. We specify the lower-hybrid waves based on the cold plasma dispersion relation and assume a Gaussian spectrum of the waves, in uniform and straight background magnetic fields. An important physical parameter is the wave propagation angle relative to the background magnetic fields. This angle is varied from 80 to 90 degrees. We evaluate the energy and the pitch-angle diffusion coefficients by taking an ensemble average of the test particle electrons. We will also discuss evolution of the electron distributions as functions of the pitch-angle and energy.
關鍵字
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 20160627~20160701
通訊作者 Otsuka, F.
國別 TWN
公開徵稿
出版型式
出處 Book of Abstracts, ICPP 2016, pp.PPM2-11
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/107557 )

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