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Ann. Geophys., 24, 1581-1590, 2006
www.ann-geophys.net/24/1581/2006/
© European Geosciences Union 2006
Observations of GPS ionospheric scintillations over Wuhan during geomagnetic storms
G. Li1,2,3, B. Ning1, W. Wan1, and B. Zhao1,2,3
1Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
2Wuhan Institute of Physics and Mathematics, CAS, Wuhan, China
3Graduate School of Chinese Academy of Sciences, Beijing, China
Abstract. During the two geomagnetic storms which occurred on 1 October 2002 and 22 January 2004,
the strong ionospheric scintillations of the GPS L1
band were observed at Wuhan station (30.6° N, 114.4° E,
45.8° Dip), which is situated near the northern crest of the
equatorial ionosphere anomaly. We found that the intense scintillations were
associated with the main phases of the storms and were co-located with the
enhancement of the equatorial ionization anomaly (EIA); the
co-existence of large- and small-scale irregularities at post-midnight was
also found. The results may be relevant regarding the influence of the equatorial
ionospheric eastward electric field during geomagnetic storms. On the other
hand, GPS L1 band scintillations were not observed during the other two
similar storms on 16 July 2003 and 20 November 2003. One of the reasons is
probably that the sporadic E layer observed at the storms inhibited the
generation of spread F by changing the Pedersen conductivity and suppressing
the upward plasma drift.
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