Modulation of chorus intensity by ULF waves deep in the inner magnetosphere

Document Type

Article

Publication Date

9-28-2016

Abstract

Previous studies have shown that chorus wave intensity can be modulated by Pc4-Pc5 compressional ULF waves. In this study, we present Van Allen Probes observation of ULF wave modulating chorus wave intensity, which occurred deep in the magnetosphere. The ULF wave shows fundamental poloidal mode signature and mirror mode compressional nature. The observed ULF wave can modulate not only the chorus wave intensity but also the distribution of both protons and electrons. Linear growth rate analysis shows consistence with observed chorus intensity variation at low frequency (f <∼ 0.3fce), but cannot account for the observed higher-frequency chorus waves, including the upper band chorus waves. This suggests the chorus waves at higher-frequency ranges require nonlinear mechanisms. In addition, we use combined observations of Radiation Belt Storm Probes (RBSP) A and B to verify that the ULF wave event is spatially local and does not last long.

Identifier

84989360790 (Scopus)

Publication Title

Geophysical Research Letters

External Full Text Location

https://doi.org/10.1002/2016GL070280

e-ISSN

19448007

ISSN

00948276

First Page

9444

Last Page

9452

Issue

18

Volume

43

Grant

1405041

Fund Ref

National Science Foundation

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