Cross-polar cap potential difference, auroral electrojet indices, and solar wind parameters

Details Cross-polar cap potential difference, auroral electrojet indices, and solar wind parameters Cross-polar cap potential difference, auroral electrojet indices, and solar wind parameters

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1345a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 1, 1992, p. 1345-1352. Research supported by Korea Science and E

Physics

32

Auroral Electrojets, Earth Magnetosphere, Polar Caps, Solar Wind, Electric Potential, Ionospheric Conductivity, Solar Terrestrial Interactions

Scientific paper

Results are presented of an estimate of the cross-polar cap potential difference Phi (KRM) from ground magnetic perturbation data through the magnetometer inversion method of Kamide et al. (1981), combined with an 'empirical' ionospheric conductance distribution estimated from the DMSP X-ray image data. A significant correlation is found between Phi (KRM) and the AE(12) index. Phi (KRM) is then compared with the potential difference estimated from a more direct method of the satellite electric field measurements and also with Phi (IMF) based on solar wind parameters. Phi (IMF) is found to be linearly correlated with Phi (KRM), as Phi (IMF) = 29.8 + 0.999 Phi (KRM), with the highest correlation obtained for a 40-min lag in the IMF. The hypothesis that directly driven processes are more important than unloading processes during disturbed periods is confirmed.

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