Magnetic field variations in the polar region during magnetically quiet periods and interplanetary magnetic fields

Details Magnetic field variations in the polar region during magnetically quiet periods and interplanetary magnetic fields Magnetic field variations in the polar region during magnetically quiet periods and interplanetary magnetic fields

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ssrv...18..777f&link_type=abstract

Space Science Reviews, vol. 18, Mar.-May 1976, p. 777-861.

Computer Science

5

Interplanetary Magnetic Fields, Ionospheric Electron Density, Magnetic Disturbances, Magnetic Variations, Polar Regions, Annual Variations, Diurnal Variations, Earth Magnetosphere, Geomagnetism, Ionospheric Currents, Polar Substorms, Regression Analysis

Scientific paper

The concepts of near-pole magnetic-field variations during magnetically quiet periods are explored, with special emphasis on the relationship of these variations to interplanetary magnetic field components. Methods are proposed for relating the variations to the fields from the various sources. It is assumed that the field variations in the summer polar cap during magnetically quiet periods consist of the following components: (1) the middle-latitude Sq variation extended to the polar region; (2) the DPC single-cell current system with a polar electrojet in dayside cusp latitudes; (3) the DMC two-cell current system of magnetospheric convection, in the form of a homogeneous current sheet in the polar cap towards the sun with return currents through lower latitudes; (4) the DPC single-cell counterclockwise current system with a focus in the dayside cusp region. Quantitative relations between the near-pole variation intensities and the value and sign of the IMF azimuthal component have been obtained and used to suggest ways of diagnosing the interplanetary magnetic field on the basis of ground observations.

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