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Ann. Geophys., 24, 2413-2418, 2006
www.ann-geophys.net/24/2413/2006/
© European Geosciences Union 2006
The solar eruption of 13 May 2005: EISCAT and MERLIN observations of a coronal radio burst
R. A. Jones1, A. R. Breen1, R. A. Fallows1, M. M. Bisi1, P. Thomasson2, G. Wannberg3, and C. A. Jordan2
1Institute of Mathematical and Physical Sciences, University of Wales, Aberystwyth, UK
2Jodrell Bank Observatory, Manchester University, UK
3EISCAT Scientific Association, Kiruna, Sweden
Abstract. We report results from EISCAT and MERLIN observations of
radio scintillation during a solar eruptive event in May 2005. Anomalous
increases in signal strength detected at sites more than 2000 km apart are
shown to arise from the detection of a strong coronal radio burst in the
distant off-axis response of the MERLIN and EISCAT antennas. These
observations show that EISCAT is capable of detecting the signatures of
explosive events in the solar atmosphere with a high degree of time
resolution. We further suggest that the highly time-structured variation in
signal strength caused by distant off-axis detection of a powerful coronal
radio signal could provide an explanation for previously unexplained
anomalies in EISCAT IPS observations, as well as being a potential source of
errors in active observations using radar codes with a completion time
longer than the time-variation of the coronal signal.
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