High-latitude geomagnetic variations and substorms

Details High-latitude geomagnetic variations and substorms High-latitude geomagnetic variations and substorms

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ssrv...20..621m&link_type=abstract

Space Science Reviews, vol. 20, July 1977, p. 621-675.

Computer Science

4

Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Variations, Polar Substorms, Auroral Electrojets, Convection Currents, Electric Fields, Magnetic Disturbances

Scientific paper

High-latitude geomagnetic variations caused by fluctuations of the interplanetary magnetic field (IMF) are reviewed. Quiet-time variations discussed include certain high-latitude current systems and fields, effects of the Y and Z components of the IMF, and delta subscript Y fields. Observations of magnetospheric substorms are examined in detail, with special attention given to substorms in the southern and northern IMF, local features of substorm development, magnetic-substorm onset, the polar substorm electrojet, enhancement of magnetospheric convection and DP-2 currents, 'dawn-dusk' inequalities in magnetospheric electric fields and currents, and substorm breakup and recovery phases. It is concluded that: (1) the X, Y, and Z components of the IMF all have a strong effect on electric fields and currents in the quiet and the disturbed magnetosphere; (2) all such effects agree qualitatively with the expected consequences of the reconnection hypothesis; (3) a magnetospheric cleft is closed, and its ionospheric projection is quasi-circular in shape; and (4) the zone of the magnetospheric cleft coincides with the region of enhanced particle precipitation.

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