报告题目：
“Zipper-Like” Periodic Magnetosonic Waves: Van Allen Probes, THEMIS, and Magnetospheric Multiscale Observations

报告人：Dr. Jinxing Li (Department of Atmospheric and Oceanic Sciences, UCLA, USA)

报告时间：2017年1月12日下午3:00

报告地点：电子信息学院320会议室

报告人简介：
    Dr.Jinxing Li got his bachelor’s degree of applied physics in Xi’an Jiaotong University in 2009. Then he went to Peking University for his PhD study under the guidance of Prof. Zuyin Pu, and received his PhD degree of space physics in 2015. Now he is a postdoc in University of California, Los Angeles (UCLA), working with Prof. Jacob Bortnik.
During his PhD career, he had visited UCLA working with Prof. Richard Thorne and Dr. Binbin Ni. His most famous work was uncovering the formation mechanism of the energetic electron butterfly distribution in the radiation belts. By systematically analyzing the satellite measurement data, he and his collaborators discovered with profound evidence that, one kind of electromagnetic waves in the radiation belts called “magnetosonic waves” are responsible for those electron butterfly distributions, and their proposed mechanism have been verified by wave-particle interaction simulations.

报告简介：
An interesting form of “zipper-like” magnetosonic waves consisting of two bands of interleaved periodic rising-tone spectra was newly observed by the Van Allen Probes, the THEMIS, and the Magnetospheric Multiscale (MMS) missions. The two discrete bands are distinct in frequency and intensity, however, they maintain the same periodicity which varies in space and time, suggesting that they possibly originate from one single source intrinsically. In one event, the “zipper-like” magnetosonic waves exhibit the same periodicity as a constant frequency magnetosonic wave and an electrostatic emission, but the modulation comes from neither density fluctuations nor ULF waves. A statistical survey based on 3.5 years of multi-satellite observations shows that “zipper-like” magnetosonic waves mainly occur on the dawn-to-noon side, in a frequency range between 10 fcp and fLHR. The “zipper-like” magnetosonic waves may provide a new clue to nonlinear excitation or modulation process while its cause still remains to be fully understood.

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