Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 47, Issue 15, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL088853
Keywords
nonlinear wave particle interaction; large frequency variations; intense whistler waves; chorus waves; frequency sweep rate; wave packet size
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Funding
- NASA through JHU/APL under NASA Prime contract [921647, NAS5-01072]
- NSF [2026375, 1914594]
- NASA [NAS5-02099]
- German Ministry for Economy and Technology
- German Aerospace Center (DLR) [50 OC 0302]
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Whistler mode chorus waves are responsible for electron acceleration in Earth's radiation belts. It is unclear, however, whether the observed acceleration is still well described by quasi-linear theory, or if this acceleration is due to intense waves that require nonlinear treatment. Here, we perform a comprehensive statistical analysis of intense lower-band chorus wave packets to investigate the relationships between wave frequency variations, packet length, and wave amplitude, and their temporal variability. We find that 15% of the wave power is carried by long packets, with low frequency sweep rates (linear trend in time) that agree with the nonlinear theory of chorus wave growth. Eighty-five percent of the wave power, however, comes from short packets with large frequency variations around the linear trend. The kappa-like probability distribution of these variations is consistent with random superposition of different waves that could result in a destruction of nonlinear resonant interaction.
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