Polar cap electric field dependence on solar wind and magnetotail parameters

Details Polar cap electric field dependence on solar wind and magnetotail parameters Polar cap electric field dependence on solar wind and magnetotail parameters

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1261l&link_type=abstract

Geophysical Research Letters, vol. 8, Dec. 1981, p. 1261-1264.

Physics

7

Electric Fields, Geomagnetic Tail, Interplanetary Magnetic Fields, Polar Caps, Solar Terrestrial Interactions, Solar Wind, Atmospheric Models, Convection, Earth Magnetosphere, Electric Field Strength

Scientific paper

The influence of interplanetary magnetic field and magnetotail parameters on convection patterns in the polar cap is examined by the use of a numerical model of the magnetospheric field on which is linearly superposed a uniform external field. In the model, the -V x B solar wind electric field is mapped onto the polar cap along the open field lines interconnected with the IMF under the assumption of infinite parallel conductivity. It is found that as the magnetotail field intensity increases, the polar cap size increases, the overall electric field intensity decreases, and the dependence of the total open flux on the magnitude and direction of the IMF weakens. In addition, the tail field is shown to intensify features such as polar cap boundary displacements and electric field intensity gradients in the northern (southern) cap when the earth is in an away (toward) sector of the IMF, and increase the extent of sunward convection in the north (south) cap for a toward (away) sector. It is noted that the results apply mainly to periods around the equinoxes.

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