中文核心期刊
CNKI期刊全文数据库
中国科学引文数据库(CSCD)源期刊
中国科技论文统计源期刊
万方数据知识服务平台
英国《科学文摘》(SA)
美国化学文摘(CA)
俄罗斯《文摘杂志》(AJ)
德国《天文学与天体物理学文摘》(AAA)
英国《中国天文学和天体物理学》(SCI收录)全文摘译期刊之一
《中国学术期刊文摘》
《中国物理文摘》
《中国天文学文摘》

Chinese Journal of Space Science ›› 2018, Vol. 38 ›› Issue (2): 169-177.doi: 10.11728/cjss2018.02.169

Previous Articles     Next Articles

Kinetic Magnetic Turbulence Associated with Flux Transfer Events Observed by THEMIS Satellite ormalsize

ZHOU Zhaodi1,2,3, ZHANG Hui1,2, NI Binbin4,5, ZHANG Xiaojia6,7, ZHU Changbo1,2,3, FU Song4   

  1. 1. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
    2. Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
    3. College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049;
    4. School of Electronic Information, Wuhan University, Wuhan 430072;
    5. State Key Laboratory of Space Weather, Nation Space Science Center, Chinese Academy of Sciences, Beijing 100190;
    6. Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles 90095;
    7. Institute of Geophysics and Space Physics, University of California, Los Angeles 90095
  • Received:2017-04-11 Revised:2017-10-24 Online:2018-03-15 Published:2018-03-09

Abstract:

Intense magnetic fluctuations are recorded in the magnetosphere near the magnetopause when Flux Transfer Events (FTE) are passed by the THEMIS satellites. The power spectra of these fluctuations obtained by Fast Fourier Transform (FFT) show that the Power Spectra Density (PSD) peaks around the disturbance frequency of FTE (about 0.1Hz), and decreases from the proton gyrofrequency (about 1Hz) to 64Hz following a power law of P0f-α. These fluctuations are interpreted as magnetic turbulences in the kinetic regime in the Low Latitude Boundary Layer (LLBL). The results show that both the PSD and the slopes of the power spectra α decrease when the observing satellite position is more and more away from the magnetopause or the FTE location in the LLBL. However, α and the PSD are independent from the azimuthal position of FTE or local time of the low latitude magnetopause. All these observations suggest that the moving FTEs are the source for these magnetic fluctuations. Large scale perturbations on the magnetopause, e.g. FTEs and the associated magnetic turbulences, provide a hint which may reveal the interaction between the magnetosheath and the magnetosphere in a kinetic scale. Whether the magnetic turbulences can provide enough viscosity for the forming of the flow vortices on the magnetospheric side of FTEs or not need to be further confirmed.

Key words: Flux transfer event, Magnetic turbulence, Spectral index, Power spectra density, Viscosity

CLC Number: