Configuration of the auroral distribution for interplanetary magnetic field Bz northward. II - Ionospheric convection consistent with Viking observations

Details Configuration of the auroral distribution for interplanetary magnetic field Bz northward. II - Ionospheric convection consistent with Viking observations Configuration of the auroral distribution for interplanetary magnetic field Bz northward. II - Ionospheric convection consistent with Viking observations

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.5805j&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 5805-5816. Research supported by NSERC.

Physics

41

Auroral Zones, Birkeland Currents, Convection Currents, Earth Ionosphere, Interplanetary Magnetic Fields, Satellite Observation, Azimuth, Field Aligned Currents, Northern Hemisphere, Polar Regions, Spatial Distribution, Viking Spacecraft

Scientific paper

Views of the northern hemisphere auroral distribution obtained by the Viking satellite present a qualitative means of inferring the convective patterns which occur during IMF B(z) northward. The approach is taken whereby upward field-aligned currents are assumed to be coincident with large-scale discrete auroral features and on this basis possible convective patterns are deduced. While the patterns are not unique solutions, they are found to be consistent with merging theory predictions: for B(z) northward, the auroral observations support the possibility of three and/or four cell patterns. When the IMF azimuthal angle is 90 deg (270 deg), a clockwise (anticlockwise) cell is found to be located in the polar region between the two standard viscous cells. When IMF B(x) dominates and is in a toward orientation, convection stagnates, whereas if B(x) is negative, a four-cell pattern may form with sunward flow at very high latitudes.

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