Intense growth phase events of substorms

J. H. Shue, Y. Kamide, R. D. Elphinstone, N. Nishitani

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5 Scopus citations


Over the past few decades, several events of the intense growth phase preceding the expansion onset of substorms were reported. We reexamine these events using an extensive set of data, including ground-based magnetograms at auroral latitudes, solar wind data from the Wind and IMP 8 satellites, and auroral UV images from the Polar and Viking satellites. Magnetograms show that the intense auroral electrojet is located in the early morning sector during these events. A common feature among the corresponding solar wind conditions for these events is the existence of a period of southward interplanetary magnetic field (IMF) preceded by a prolonged northward IMF. This intense growth phase, however, seems to be independent of the IMF By polarity. Enhanced auroras in the early morning sector appear during the growth phase. These auroras are consistent with relatively large geomagnetic disturbances during these events, indicating that enhanced conductances, combined with enhanced electric field caused by southward IMF, play an important role in the auroral electrojet during these intense growth-phase events.

Original languageEnglish
Article number1999JA900454
Pages (from-to)5357-5371
Number of pages15
JournalJournal of Geophysical Research: Space Physics
Issue numberA3
StatePublished - 1 Mar 2000


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