Effects of solar wind density on auroral electrojets and brightness under influence of substorms

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题名:	Effects of solar wind density on auroral electrojets and brightness under influence of substorms
作者:	Shue,JH;Kamide,Y;Gjerloev,JW
贡献者:	太空科學研究所
关键词:	INTERPLANETARY MAGNETIC-FIELD;ART. NO. 1428;PRESSURE PULSE;ULTRAVIOLET IMAGER;JANUARY 10;EMISSIONS;STORM
日期:	2009
上传时间:	2010-06-29 18:37:35 (UTC+8)
出版者:	中央大學
摘要:	Using the auroral electrojet indices and Polar Ultraviolet Imager auroral images, we examined two fortuitous events during which the solar wind density had clear enhancements while the other solar wind parameters were relatively constant. Two electrojet enhancements were found in each event. The first electrojet enhancement was likely to be related to a substorm in which an auroral bulge appeared at premidnight. The second electrojet enhancement was driven by the density enhancement in the solar wind. The auroral oval became wider in latitude and the auroral distribution became dispersed after the density enhancement arrived at the Earth. The total auroral power integrated over the entire nightside region from 50 to 80 degrees MLAT, however, did not increase significantly in response to the density enhancement. Our interpretation is that the substorm that occurred prior to the solar wind density enhancement had drained out a significant portion of the stored energy in the magnetotail; therefore, less precipitation energy was deposited into the auroral ionosphere by the density enhancement.
關聯:	ANNALES GEOPHYSICAE
显示于类别:	[太空科學研究所 ] 期刊論文

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