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空间科学学报 ›› 2015, Vol. 35 ›› Issue (4): 403-408.doi: 10.11728/cjss2014.04.403

• 日球层物理和太阳系探测 • 上一篇    下一篇

Determination of the Kelvin-Helmholtz Wave Parameters on the Magnetopause in Single-spacecraft Observations

LIN Dong1,2, WANG Chi1, LI Wenya1,2, TANG Binbin1   

  1. 1. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190;
    2. University of Chinese Academy of Sciences, Beijing 100049
  • 收稿日期:2014-04-04 修回日期:2014-08-20 出版日期:2015-06-15 发布日期:2015-06-30
  • 基金资助:

    Supported by the National Basic Research Program (2012CB825602), National Natural Science Foundation of China (41231067, 41174143), and the Specialized Research Fund for State Key Laboratories of China

Determination of the Kelvin-Helmholtz Wave Parameters on the Magnetopause in Single-spacecraft Observations

LIN Dong1,2, WANG Chi1, LI Wenya1,2, TANG Binbin1   

  1. 1. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190;
    2. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2014-04-04 Revised:2014-08-20 Online:2015-06-15 Published:2015-06-30

摘要:

Kelvin-Helmholtz (K-H) waves are formed from the triggeringof the K-H instability on the magnetopause, which is a candidatemechanism for solar wind entry into the magnetosphere, especially undernorthward interplanetary magnetic field conditions. In this study, aK-H wave event was identified from the observation of probe Bof the Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission on 15 May 2008. A new method to determinethe wave parameters of the K-H waves in single-spacecraft observationsis proposed. The dominant wave period is determined by three kinds ofspectrograms for three key parameters, namely the ion density, the iontemperature, and the z component of magnetic field. The phasevelocity is estimated by calculating the center-of-mass velocity of thedetected K-H vortex region. This approximation is validated bycomparison with other alternative methods. The method to determine thewave parameters is a first step to further study K-H wave properties and their relationship with interplanetaryconditions.

关键词: Kelvin-Helmholtz waves, Magnetopause, Single-spacecraft observation

Abstract:

Kelvin-Helmholtz (K-H) waves are formed from the triggeringof the K-H instability on the magnetopause, which is a candidatemechanism for solar wind entry into the magnetosphere, especially undernorthward interplanetary magnetic field conditions. In this study, aK-H wave event was identified from the observation of probe Bof the Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission on 15 May 2008. A new method to determinethe wave parameters of the K-H waves in single-spacecraft observationsis proposed. The dominant wave period is determined by three kinds ofspectrograms for three key parameters, namely the ion density, the iontemperature, and the z component of magnetic field. The phasevelocity is estimated by calculating the center-of-mass velocity of thedetected K-H vortex region. This approximation is validated bycomparison with other alternative methods. The method to determine thewave parameters is a first step to further study K-H wave properties and their relationship with interplanetaryconditions.

Key words: Kelvin-Helmholtz waves, Magnetopause, Single-spacecraft observation

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