Effect of whistler waves on electron bounce motion in the Earth's magnetotail
學年 110
學期 1
發表日期 2021-10-31
作品名稱 Effect of whistler waves on electron bounce motion in the Earth's magnetotail
作品名稱（其他語言）
著者 Fumiko Otsuka; Kaiti Wang; KIROLOSSE MINA GIRGIS; Tohru Hada
作品所屬單位
出版者
會議名稱 The 150th SGEPSS General Assembly (第150回　地球電磁気・地球惑星圏学会 総会・講演会)
會議地點 Online via Zoom
摘要 Whistler waves play an important role in the scattering of energetic electrons in the Earth's magnetosphere. Pitch-angle scattering of trapped electrons caused by the wave-particle interaction via such waves violates the invariant of periodic bounce motion of the electrons in the dipolar magnetic field.We study the effects of whistler waves on the electron bounce motion in the Earths magnetotail by performing test particle simulations. We use three models for the background magnetic field; a uniform field, a pure dipolar field, and a stretched dipole-like field. Oblique whistler waves, localized around the magnetic equator, are given as a superposition of sinusoidal waves obeying a cold plasma dispersion relation. We solve a relativistic equation of motion of electrons in the given electromagnetic fields. Electron bounce periods are evaluated as functions of the electron energy and the initial pitch-angle and are compared with the adiabatic theory. We demonstrate that the electrons sometimes switch their guiding field lines due to the wave scattering, and their mirror points and bounce periods vary in time. We will discuss these results referring to a THEMIS observation of the dipolarization event detected at ˜10 RE tailside near the magnetic equator.
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 20211031~20211104
通訊作者 Fumiko Otsuka
國別 JPN
公開徵稿
出版型式
出處 The 150th SGEPSS General Assembly
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/121795 )