Effects of solar wind density on the auroral electrojets and global auroras during geomagnetic storms

Y. Kamide, J. H. Shue, M. Brittnacher

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

2 Scopus citations


It was shown statistically, some thirty years ago, that substorms occurring during the initial phase of geomagnetic storms and those during the main phase are different in character. Substorms during geomagnetic storms, regardless of the phases in which they occur, were also shown to be different from normal isolated substorms in terms of the relative strength between the eastward and westward auroral electrojets. Based on the intensities of the auroral electrojets estimated from ground magnetometer data and on the distribution of large-scale auroras seen in Polar auroral images, the present study shows that the solar wind density does in fact control the intensity of the auroral electrojets and the associated auroral activity, but the efficiency of the control depends strongly on the polarity of interplanetary magnetic field (IMF). The earlier statistical results can consistently be accounted for by considering that the initial phase of geomagnetic storms is caused by the high dynamic pressure (or density) of the solar wind, while southward IMF dominates the main phase.

Original languageEnglish
Title of host publicationDisturbances in Geospace
Subtitle of host publicationThe Storm-Substorm Relationship, 2003
EditorsA. Surjalal Sharma, Yohsuke Kamide, Gurbax S. Lakhina
PublisherBlackwell Publishing Ltd
Number of pages8
ISBN (Electronic)9781118665770
ISBN (Print)9780875904078
StatePublished - 2003

Publication series

NameGeophysical Monograph Series
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779


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