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Ann. Geophys., 18, 1067-1072, 2000
www.ann-geophys.net/18/1067/2000/
© European Geosciences Union 2000
Combined ESR and EISCAT observations of the dayside polar cap and auroral oval during the May 15, 1997 storm
H. Liu1,2, K. Schlegel1, and S.-Y. Ma2,3
1Max-Planck-Institut für Aeronomie, Max-Planck-Str. 2, D-37191 Katlenburg-Lindau, Germany
e-mail: liu@linmpi.mpg.de
2Space physics department, Wuhan University, Wuhan 430072, China
3Wuhan Ionospheric Observatory, Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, Wuhan 430071, China
Correspondence to: Huixin Liu
Abstract. 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.
Key words: Ionosphere (auroral ionosphere; polar
ionosphere) - Magnetospheric physics (storms and substorms)
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