期刊论文

Chen, Lunjin

英文

GEOPHYSICAL RESEARCH LETTERS

0094-8276

2019

46

13

7096-7104

10.1029/2019GL083421

The authors are thankful to the MMS team for making their data available to the public (https://lasp.colorado.edu/ mms/sdc/public). We thank the software development teams for SPEDAS (http://themis.ssl.berkeley. edu/software.shtml). This work is supported by the National Natural Science Foundation of China grants 41504125, 41531072, 41674166, and 41774194; the China Scholarship Council; the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province; and the Construct Program of the Key Discipline in Hunan Province. Work at UTD is supported by the AFOSR grant of FA9550-16-1-0344.

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We present a Magnetospheric Multiscale mission observation of quasiperiodic electromagnetic ion cyclotron (EMIC) variations on 24 December 2015 corresponding to magnetic field depressions as well as proton pitch angle anisotropy enhancements. Proton dynamic pressure obtained by WIND indicates that the solar wind was periodically compressing the magnetosphere with a period ∼7.5min, which is consistent with the EMIC modulation period observed by the Magnetospheric Multiscale. Numerical calculations demonstrate that the EMIC modulation period is ...