Observation of a double-onset substorm during northward interplanetary magnetic field

Details Observation of a double-onset substorm during northward interplanetary magnetic field Observation of a double-onset substorm during northward interplanetary magnetic field

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..864l&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 11-12, p. 864-868.

Physics

Scientific paper

For the first time, a substorm event with double onsets is shown observationally under northward IMF condition in this study. Magnetic field data from ground stations and from geosynchronous satellite, and aurora data from IMAGE satellite are examined to study the substorm activity. The results show that the intensity and the spatial extent of the event are as large as those of typical substorms. Another interesting finding is that two expansion onsets seem to occur during the event. A possible mechanism for the two onsets was proposed. The energy source for the event was also discussed.

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