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

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Title:	Effects of solar wind density on auroral electrojets and brightness under influence of substorms
Authors:	Shue,JH;Kamide,Y;Gjerloev,JW
Contributors:	太空科學研究所
Keywords:	INTERPLANETARY MAGNETIC-FIELD;ART. NO. 1428;PRESSURE PULSE;ULTRAVIOLET IMAGER;JANUARY 10;EMISSIONS;STORM
Date:	2009
Issue Date:	2010-06-29 18:37:35 (UTC+8)
Publisher:	中央大學
Abstract:	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.
Relation:	ANNALES GEOPHYSICAE
Appears in Collections:	[Graduate Institute of Space Science] journal & Dissertation

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