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Auroral disturbances during the January 10, 1997 magnetic storm
Author(s) -
Lyons L. R.,
Zesta E.,
Samson J. C.,
Reeves G. D.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl000014
Subject(s) - substorm , geophysics , convection , solar wind , geomagnetic storm , geology , storm , longitude , dynamic pressure , magnetosphere , atmospheric sciences , latitude , physics , magnetic field , geodesy , meteorology , mechanics , oceanography , quantum mechanics
It is well known that intense and frequent auroral‐zone disturbances, often attributed to substorms, occur during magnetic storms. We examine observations during the January 10, 1997 main phase and find that observed auroral‐zone activity was dominated by a combination of global auroral and current enhancements, which are a direct response to solar wind dynamic pressure enhancements, and poleward boundary intensifications, which are localized in longitude and have an auroral signature that moves equatorward from the magnetic separatrix. Poleward and azimuthally expanding regions of auroral activity which accompany substorms are found to contribute significantly less to the observed activity. This suggests that poleward boundary intensifications and dynamic pressure responses may be an important cause of disturbances during periods of enhanced convection such as magnetic storms and convection bays.