THEMIS observation of chorus elements without a gap at half the gyrofrequency
書誌事項
- 公開日
- 2012-11
- 資源種別
- journal article
- 権利情報
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- ©2012. American Geophysical Union.
- DOI
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- 10.1029/2012ja018076
- 公開者
- American Geophysical Union
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説明
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.
収録刊行物
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- Journal of Geophysical Research: Space Physics
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Journal of Geophysical Research: Space Physics 117 (A11), A11223-, 2012-11
American Geophysical Union
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詳細情報 詳細情報について
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- CRID
- 1050282810779263232
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- NII論文ID
- 120005540436
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- NII書誌ID
- AA00698937
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- ISSN
- 21562202
- 01480227
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- HANDLE
- 2433/193717
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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