Solar wind magnetosphere coupling during an isolated substorm event: A multispacecraft ISTP study

Research output: Contribution to journalArticleScientificpeer-review


  • T.I. Pulkkinen
  • DN Baker
  • NE Turner
  • HJ Singer
  • LA Frank
  • JB Sigwarth
  • J Scudder
  • R Anderson
  • S Kokubun
  • R Nakamura
  • T Mukai
  • JB Blake
  • CT Russell
  • H Kawano
  • F Mozer
  • JA Slavin

Research units

  • University of Iowa
  • University of California at Los Angeles
  • Institute of Space and Astronautical Science
  • National Oceanic and Atmospheric Administration
  • NASA Goddard Space Flight Center
  • Finnish Meteorological Institute
  • Nagoya University
  • Aerospace Corporation
  • University of California at Berkeley
  • University of Colorado Boulder


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.


Original languageEnglish
Pages (from-to)983-986
Number of pages4
JournalGeophysical Research Letters
Issue number8
Publication statusPublished - 15 Apr 1997
MoE publication typeA1 Journal article-refereed

    Research areas


ID: 3013786