Studies of the substorm on March 12, 1991: 1. Structure of substorm activity and auroral ions

Details Studies of the substorm on March 12, 1991: 1. Structure of substorm activity and auroral ions Studies of the substorm on March 12, 1991: 1. Structure of substorm activity and auroral ions

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cosre..45...27l&link_type=abstract

Cosmic Research, Volume 45, Issue 1, pp.27-38

Physics

94.30.Aa

Scientific paper

The substorm on March 12, 1991 is studied using the data of ground-based network of magnetometers, all-sky cameras and TV recordings of aurora, and measurements of particle fluxes and magnetic field onboard a satellite in the equatorial plane. The structure of substorm activity and the dynamics of auroral ions of the central plasma sheet (CPS) and energetic quasi-trapped ions related to the substorm are considered in the first part. It is shown that several sharp changes in the fluxes and pitch-angle distribution of the ions which form the substorm ion injection precede a dipolarization of the magnetic field and increases of energetic electrons, and coincide with the activation of aurora registered 20° eastward from the satellite. A conclusion is drawn about different mechanisms of the substorm acceleration (injection) of electrons and ions.

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