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

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 sign...

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Bibliographic Details
Published in:Geophysical research letters 2016-09, Vol.43 (18), p.9444-9452
Main Authors: Xia, Zhiyang, Chen, Lunjin, Dai, Lei, Claudepierre, Seth G., Chan, Anthony A., Soto‐Chavez, A. R., Reeves, G. D.
Format: Article
Language:English
Subjects:
ASTRONOMY AND ASTROPHYSICS
chorus modulation
Chorus waves
Frequency ranges
Geophysics
Growth rate
inner magnetosphere
Low frequency
Magnetic fields
Magnetosphere
Magnetospheres
Mathematical analysis
Modulation
Nonlinearity
Pitch angle
Probes
Protons
Radiation
Sensors
Signatures
Storms
ULF
ULF wave
ULF waves
Waves
whistler wave
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Summary: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
ISSN:0094-8276
1944-8007
DOI:10.1002/2016GL070280