Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000angeo..18.1067l&link_type=abstract
Annales Geophysicae, vol. 18, Issue 9, pp.1067-1072
Physics
2
Ionosphere (Auroral Ionosphere, Polar Ionosphere) -, Magnetospheric Physics (Storms And Substorms)
Scientific paper
The high-latitude ionospheric response to a major magnetic storm on May 15, 1997 is studied and different responses in the polar cap and the auroral oval are highlighted. Depletion of the F2 region electron density occurred in both the polar cap and the auroral zone, but due to different physical processes. The increased recombination rate of O+ ions caused by a strong electric field played a crucial role in the auroral zone. The transport effect, however, especially the strong upward ion flow was also of great importance in the dayside polar cap. During the main phase and the beginning of the recovery phase soft particle precipitation in the polar cap showed a clear relation to the dynamic pressure of the solar wind, with a maximum cross-correlation coefficient of 0.63 at a time lag of 5 min.
Liu Hongya
Ma Shu Y.
Schlegel Kristian
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