Dependence of convective flows and particle precipitation in the high-latitude dayside ionosphere on the X and Y components of the interplanetary magnetic field

Details Dependence of convective flows and particle precipitation in the high-latitude dayside ionosphere on the X and Y components of the interplanetary magnetic field Dependence of convective flows and particle precipitation in the high-latitude dayside ionosphere on the X and Y components of the interplanetary magnetic field

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5557c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 1, 1991, p. 5557-5564.

Physics

174

Convective Flow, Earth Ionosphere, Interplanetary Magnetic Fields, Particle Precipitation, Auroral Zones, Earth Magnetosphere, Magnetic Field Configurations, Magnetosphere-Ionosphere Coupling, Solar Terrestrial Interactions

Scientific paper

The patterns of convective flow and particle precipitation which occur in the high-latitude dayside ionosphere and their dependence on the x and y components of the IMF are discussed. The existence of asymmetry effects at high latitudes associated with the equatorial components of the IMF result from the stresses exerted upon the magnetosphere consequent upon its magnetic interconnection with the IMF. Relaxation under the action of these stresses results in a partial penetration of the IMF inside the cavity on both open and closed field lines. The asymmetry effects occurring on closed field lines can be described in terms of a distortion of the magnetic field which to zeroth order can be modeled by the 'dipole plus uniform field' picture. In the presence of IMF B(y), the cusp will be displaced in local time away from noon in the same directions B(y) in the northern hemisphere, and in the opposite direction to B(y) in the southern hemisphere. Related effects should occur in association with the IMF B(x) as well.

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