Factors influencing the intensity of magnetospheric substorms

Details Factors influencing the intensity of magnetospheric substorms Factors influencing the intensity of magnetospheric substorms

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55.1091m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 8, p. 1091-1122.

Physics

14

Earth Magnetosphere, Intensity, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Magnetic Storms, Auroral Electrojets, Electric Fields, Solar Terrestrial Interactions, Solar Wind

Scientific paper

A definition of the substorm is presented, and it is shown that the typical isolated substorm is produced by the superposition of effects of processes directly driven by the solar wind through dayside reconnection and those driven by unloading through nighttime reconnection. The single factor that determines whether a substorm will occur or not is the clock angle of the interplanetary magnetic field (IMF) around the earth-sun line. Only when this field points south of the GSM equatorial plane do the auroral electrojet indices depart from their quiet values. For a given clock angle, the level of activity increases with the IMF strength and solar wind velocity.

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