Effects of interplanetary magnetic field and magnetospheric substorm variations on the dayside aurora

Details Effects of interplanetary magnetic field and magnetospheric substorm variations on the dayside aurora Effects of interplanetary magnetic field and magnetospheric substorm variations on the dayside aurora

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31.1345s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, Nov. 1983, p. 1345-1362. Research supported by the Norges Almenvitenskape

Computer Science

Sound

24

Auroras, Interplanetary Magnetic Fields, Magnetospheric Instability, Polar Substorms, Arctic Regions, Geomagnetism, Ground Stations, Magnetic Signatures, Satellite Sounding

Scientific paper

Photometric auroral observations and geomagnetic measurements obtained simultaneously on the dayside in Norway and the nightside in the USSR, Alaska, and Canada are combined with ISEE-1 and 3 data on the interplanetary magnetic field (IMF) to study the relative importance of substorm perturbations and IMF in determining dayside auroral (DA) motion. Ten events from December, 1978, and January and December, 1979, are characterized, the data are presented in tables, illustrated with charts and graphs, and summarized. The equatorward and poleward motion of the DA is correlated with the growth and decay of DP2-mode geomagnetic disturbances and changes in the north-south component of the IMF. Discrete DA forms appear in a region of sunward-convecting field lines. A detailed model of DA motion is developed which explains these phenomena as the result of a direct global response of the magnetospheric electromagnetic state to the solar-wind magnetic field. Using the model, the potential drop, Pedersen current, and Joule heat-dissipation rate of the polar-cap ionosphere are estimated as 125 kV, 800,000 A, and 100 GW, respectively.

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