Studies of the substorm on March 12, 1991: 1. Structure of substorm activity and auroral ions |
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| Authors: | L L Lazutin T V Kozelova N P Meredith M Danielides B V Kozelov J Jussila A Korth |
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| Institution: | (1) Skobeltsyn Institute of Nuclear Physics, Moscow State University, Vorob’evy gory, Moscow, 119899, Russia;(2) Polar Geophysical Institute, Kola Scientific Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184200, Russia;(3) Mullard Space Science Laboratory, University College London, British Antarctic Survey, Cambridge, Great Britain, UK;(4) Oulu University, Finland;(5) Max Planck Institute, Lindau, Germany |
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| Abstract: | 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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