Intensification of preexisting auroral arc at substorm expansion phase onset: Wave‐like disruption during the first tens of seconds
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- Jun Liang
- Space Science Branch Canadian Space Agency St‐Hubert, Quebec Canada
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- E. F. Donovan
- Department of Physics and Astronomy University of Calgary Calgary, Alberta Canada
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- W. W. Liu
- Space Science Branch Canadian Space Agency St‐Hubert, Quebec Canada
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- B. Jackel
- Department of Physics and Astronomy University of Calgary Calgary, Alberta Canada
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- M. Syrjäsuo
- Finnish Meteorological Institute Helsinki Finland
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- S. B. Mende
- Space Science Laboratory University of California at Berkeley Berkeley USA
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- H. U. Frey
- Space Science Laboratory University of California at Berkeley Berkeley USA
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- V. Angelopoulos
- Space Science Laboratory University of California at Berkeley Berkeley USA
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- M. Connors
- Athabasca University Athabasca, Alberta Canada
書誌事項
- 公開日
- 2008-05-03
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2008gl033666
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>With the deployment of the all‐sky imager array of the THEMIS mission, we were able to construct a preliminary database of auroral substorm expansion phase onsets, from which we have established a number of common features characterizing the first tens of seconds of the substorm auroral intensification. We find that the intensification occurs within ∼10 sec over an arc segment extending approximately 1 h MLT and featuring wave‐like formations distributed in longitude. The longitudinal wave number ranges between 100 and 300 such that the wavelength is comparable to the ion gyroradius in the central plasma sheet. The scale the intensification is about 10–30 sec. This study casts important observational constraints on substorm onset theories.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 35 (17), 17-, 2008-05-03
American Geophysical Union (AGU)
