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Title: THEMIS observation of chorus elements without a gap at half the gyrofrequency
Authors: Kurita, S.
Katoh, Y.
Omura, Y.
Angelopoulos, V.
Cully, C. M.
Le Contel, O.
Misawa, H.
Keywords: chorus
nonlinear
wave-particle interaction
whistler mode
Issue Date: Nov-2012
Publisher: American Geophysical Union
Journal title: Journal of Geophysical Research: Space Physics
Volume: 117
Issue: A11
Thesis number: A11223
Abstract: Using waveform data obtained by one of the THEMIS satellites, we report properties of rising tone chorus elements without a gap at half the gyrofrequency in a region close to the magnetic equator. The wave normal angle of the chorus elements is typically field-aligned in the entire frequency range of both upper-band and lower-band chorus emissions. We find that the observed frequency sweep rates are consistent with the estimation based on the nonlinear wave growth theory of Omura et al. (2008). In addition, we compare the frequency profiles of the chorus wave amplitudes with those of the optimum and threshold wave amplitudes derived from the nonlinear wave growth theory for triggering rising tone chorus emissions. The results of the comparison show a reasonable agreement, indicating that rising tone chorus elements are continually generated through a triggering process which generates elements with the optimum amplitudes for nonlinear growth.
Rights: ©2012. American Geophysical Union.
URI: http://hdl.handle.net/2433/193717
DOI(Published Version): 10.1029/2012ja018076
Appears in Collections:Journal Articles

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