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Solar wind‐magnetosphere coupling during an isolated substorm event: A multispacecraft ISTP study
Author(s) -
Pulkkinen T. I.,
Baker D. N.,
Turner N. E.,
Singer H. J.,
Frank L. A.,
Sigwarth J. B.,
Scudder J.,
Anderson R.,
Kokubun S.,
Nakamura R.,
Mukai T.,
Blake J. B.,
Russell C. T.,
Kawano H.,
Mozer F.,
Slavin J. A.
Publication year - 1997
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 - 10.1029/97gl00816
Subject(s) - substorm , solar wind , magnetosphere , geophysics , polar , physics , ionosphere , geology , atmospheric sciences , astronomy , plasma , quantum mechanics
Multispacecraft data from the upstream solar wind, polar cusp, and inner magnetotail are used to show that the polar ionosphere responds within a few minutes to a southward IMF turning, whereas the inner tail signatures are visible within ten min from the southward turning. Comparison of two subsequent substorm onsets, one during southward and the other during northward IMF, demonstrates the dependence of the expansion phase characteristics on the external driving conditions. Both onsets are shown to have initiated in the midtail, with signatures in the inner tail and auroral oval following a few minutes later.