Interhemispheric Comparisons of SuperDARN Statistical High-latitude Convection Patterns

Details Interhemispheric Comparisons of SuperDARN Statistical High-latitude Convection Patterns Interhemispheric Comparisons of SuperDARN Statistical High-latitude Convection Patterns

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm24a..07p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM24A-07

Physics

[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2447] Ionosphere / Modeling And Forecasting, [2463] Ionosphere / Plasma Convection

Scientific paper

SuperDARN line-of-sight plasma velocity data from 1998 to 2002 is used to derive independent statistical models of the convection electric field in the northern and southern high-latitude ionospheres. Similarities and differences in the corresponding convection patterns of the two hemispheres, which depend on the Interplanetary Magnetic Field (IMF) and on the earth's dipole tilt angle, are discussed. Comparisons show that convection is similar in both hemispheres for small dipole tilt angles but exhibits a strong dependence on dipole tilt angle that is asymmetric between hemispheres, particularly for IMF By dominated conditions, but roughly symmetric for northward IMF conditions. The dipole tilt dependence can be explained, for the most part, in terms of magnetic merging geometry and seasonal differences in solar-produced conductance. Results suggest that it can be important to account for the dipole tilt when using statistical models of convection derived from an opposing hemisphere. While the difference in the cross polar-cap potential between hemispheres is less than 10% on average, the strength of the convection observed in the dawn and dusk cells differs by 15% to 20% on average.

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