Determination of the Kelvin-Helmholtz Wave Parameters on the Magnetopause in Single-spacecraft Observations |
| |
Authors: | LIN Dong WANG Chi LI Wenya TANG Binbin |
| |
Institution: | 1.State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 1001902.University of Chinese Academy of Sciences, Beijing 100049 |
| |
Abstract: | Kelvin-Helmholtz(K-H) waves are formed from the triggering of the K-H instability on the magnetopause,which is a candidate mechanism for solar wind entry into the magnetosphere,especially under northward interplanetary magnetic field conditions.In this study,a K-H wave event was identified from the observation of probe B of the Time History of Events and Macroscale Interactions during Substorms(THEMIS) mission on 15 May 2008.A new method to determine the wave parameters of the K-H waves in single-spacecraft observations is proposed.The dominant wave period is determined by three kinds of spectrograms for three key parameters,namely the ion density,the ion temperature,and the z component of magnetic field.The phase velocity is estimated by calculating the center-of-mass velocity of the detected K-H vortex region.This approximation is validated by comparison with other alternative methods.The method to determine the wave parameters is a first step to further study K-H wave properties and their relationship with interplanetary conditions. |
| |
Keywords: | Kelvin-Helmholtz waves Magnetopause Single-spacecraft observation |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《空间科学学报》浏览原始摘要信息 |
| 点击此处可从《空间科学学报》下载免费的PDF全文 |
|