Relationship between the IMF, the midday gap, and auroral substorm activity

Mathematics – Logic

Scientific paper

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Auroras, Interplanetary Magnetic Fields, Polar Substorms, Magnetic Field Configurations, Satellite-Borne Photography, Southern Hemisphere

Scientific paper

The behavior of the gap in the discrete auroral arcs of the midday sector during different polarities of the interplanetary magnetic field (IMF) is reported. A study of auroral photographs from the satellites of the defense meteorological satellite program over the Southern Hemisphere for May-July 1974-75 provides the statistical characteristics of the semi-permanent gap in the day sector of the auroral oval. The gap morphology is related to the Bz component of IMF, and to the phase of the auroral substorm. The gap is wider when Bz is positive than when it is negative, and in spite of trends observed to depend on By, its role as component in the morphology of the gap could not be established. It was also confirmed that the auroral activity in the night sector depends on the phase of the auroral substorm and that the phase of the substorm is related to the variations of the Bz component of the IMF.

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