教師資料查詢 | 類別: 會議論文 | 教師: 汪愷悌 WANG KAITI (瀏覽個人網頁)

標題: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
語言英文
收錄於
會議性質國際
校內研討會地點
研討會時間20160627~20160701
通訊作者Otsuka, F.
國別中華民國
公開徵稿
出版型式
出處Book of Abstracts, ICPP 2016, pp.PPM2-11
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