Interplanetary magnetic field direction and the configuration of the day side magnetosphere

Details Interplanetary magnetic field direction and the configuration of the day side magnetosphere Interplanetary magnetic field direction and the configuration of the day side magnetosphere

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80....1h&link_type=abstract

Journal of Geophysical Research, vol. 80, Jan. 1, 1975, p. 1-6.

Physics

9

Atmospheric Models, Daytime, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Field Configurations, Cusps, Geomagnetism, Ionospheric Conductivity, Ionospheric Currents, Magnetic Dipoles, Magnetopause, Plasma Density, Plasma Pressure, Plasma-Electromagnetic Interaction, Solar Wind, Vacuum

Scientific paper

The direction of the interplanetary magnetic field appears to have a significant effect on the equilibrium size of the day side magnetosphere. The qualitative features of this effect are illustrated here by means of a simple vacuum model that ignores solar wind and ionospheric plasma densities as a first approximation. This idealized model produces earthward displacements of the subsolar magnetopause and equatorward displacements of the polar cusp associated with southward-turning interplanetary fields that are about a factor of 2 greater than observed displacements. The nonzero solar wind plasma pressure and ionospheric conductivity produce large deviations from the simple vacuum configurations but do not change the qualitative conclusions regarding magnetopause and cusp displacements associated with the north-south component of the interplanetary magnetic field.

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