Landau resonance between electrons and lower-hybrid waves in the inner magnetosphere

淡江大學機構典藏 > 工學院 > 航空太空工程學系暨研究所 > 會議論文 > Item 987654321/110338

請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/110338

題名:	Landau resonance between electrons and lower-hybrid waves in the inner magnetosphere
作者:	Fumiko Otsuka;Kaiti Wang;Shuichi Matsukiyo;Tohru Hada
關鍵詞:	pitch-angle diffusion;electron;lower-hybrid wave;inner magnetosphere
日期:	2017-05-24
上傳時間:	2017-06-02 02:10:58 (UTC+8)
出版者:	Japan Geoscience Union
摘要:	Lower-hybrid waves are frequently observed near the geomagnetic equator in the inner magnetosphere (i.e., equatorial noise). They are in the frequency range between the proton gyrofrequency and the LH frequency, and were found to propagate approximately perpendicular to the background magnetic field with almost linear polarization. We have focused on the capability of the LH waves to scatter electrons, and showed that the diffusions could occur via both cyclotron and Landau resonances. To have the cyclotron resonance to occur, the electron energies should be higher than 1.56 MeV. On the contrary, the Landau resonance occurs even for relatively lower energies from 1.4 keV. Here, the linear resonance condition is assumed under the observed LH wave parameters such as the propagation angle of 85 degree and the frequency of 130 Hz in a plasma environment with the Alfven velocity of 1150 km/s. In this presentation, we discuss the Landau resonance between electrons and LH waves, by performing test particle simulation. The LH waves are given as a superposition of sinusoidal waves with different frequencies propagating highly perpendicular to the background magnetic field. The given waves obey the cold plasma dispersion relation. We evaluate the pitch-angle diffusion coefficient of electrons with energies from a few eV to 1 MeV. We discuss changes in pitch-angle distributions related to the diffusion processes.
關聯:	PEM16-P25, Abstracts of JpGU-AGU Joint Meeting 2017
顯示於類別:	[航空太空工程學系暨研究所] 會議論文

文件中的檔案:

沒有與此文件相關的檔案.

在機構典藏中所有的資料項目都受到原著作權保護.

TAIR相關文章

資料載入中.....