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THEMIS observation of chorus elements without a gap at half the gyrofrequency
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THEMIS observation of chorus elements without a gap at half the gyrofrequency
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Journal Article
THEMIS observation of chorus elements without a gap at half the gyrofrequency
2012
Overview
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. Key Points Chorus emissions without a gap at half the gyrofrequency are investigated Frequency variation and amplitudes at the source region agree with the theory Amplitudes of the rising emissions agree with the optimum triggering amplitudes
Publisher
Blackwell Publishing Ltd,American Geophysical Union,American Geophysical Union/Wiley
