Volume 38 Issue 2
Mar.  2018
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ZHOU Zhaodi, ZHANG Hui, NI Binbin, ZHANG Xiaojia, ZHU Changbo, FU Song. Kinetic Magnetic Turbulence Associated with Flux Transfer Events Observed by THEMIS Satellite ormalsize[J]. Chinese Journal of Space Science, 2018, 38(2): 169-177. doi: 10.11728/cjss2018.02.169
Citation: ZHOU Zhaodi, ZHANG Hui, NI Binbin, ZHANG Xiaojia, ZHU Changbo, FU Song. Kinetic Magnetic Turbulence Associated with Flux Transfer Events Observed by THEMIS Satellite ormalsize[J]. Chinese Journal of Space Science, 2018, 38(2): 169-177. doi: 10.11728/cjss2018.02.169

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

doi: 10.11728/cjss2018.02.169
  • Received Date: 2017-04-11
  • Rev Recd Date: 2017-10-24
  • Publish Date: 2018-03-15
  • 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.

     

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