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Modulation of Locally Generated Equatorial Noise by ULF Wave
Author(s) -
Zhu Hui,
Chen Lunjin,
Liu Xu,
Shprits Yuri Y.
Publication year - 2019
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2018ja026199
Subject(s) - physics , proton , noise (video) , modulation (music) , computational physics , ring current , distribution (mathematics) , variation (astronomy) , acoustics , plasma , astrophysics , nuclear physics , magnetosphere , mathematics , computer science , artificial intelligence , image (mathematics) , mathematical analysis
In this paper we report a rare and fortunate event of fast magnetosonic (MS, also called equatorial noise) waves modulated by compressional ultralow frequency (ULF) waves measured by Van Allen Probes. The characteristics of MS waves, ULF waves, proton distribution, and their potential correlations are analyzed. The results show that ULF waves can modulate the energetic ring proton distribution and in turn modulate the MS generation. Furthermore, the variation of MS intensities is attributed to not only ULF wave activities but also the variation of background parameters, for example, number density. The results confirm the opinion that MS waves are generated by proton ring distribution and propose a new modulation phenomenon.