Ann. Geophysicae 18, 1067±1072 �2000) Ó EGS ± Springer-Verlag 2000 Combined ESR and EISCAT observations of the dayside polar cap and auroral oval during the May 15, 1997 storm
Abstract. The high-latitude ionospheric response to a major magnetic storm on May 15, 1997 is studied and di€erent 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 di€erent phy...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.210.2955 http://www.ann-geophys.net/18/1067/2000/angeo-18-1067-2000.pdf |
| Summary: | Abstract. The high-latitude ionospheric response to a major magnetic storm on May 15, 1997 is studied and di€erent 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 di€erent physical processes. The increased recombination rate of O + ions caused by a strong electric ®eld played a crucial role in the auroral zone. The transport e€ect, however, especially the strong upward ion ¯ow 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 coe cient of 0.63 at a time lag of 5 min. |
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