The solar eruption of 13 May 2005: EISCAT and MERLIN observations of a coronal radio burst

• Published in: Annales Geophysicae
• Main Authors: Jones, R. A., Breen, A. R., Fallows, R. A., Bisi, M. M., Thomasson, P., Wannberg, G., Jordan, C. A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2006
• Subjects: article; Verlagsveröffentlichung; EISCAT
• Online Access: https://doi.org/10.5194/angeo-24-2413-2006; https://noa.gwlb.de/receive/cop_mods_00033070; https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00033024/angeo-24-2413-2006.pdf; https://angeo.copernicus.org/articles/24/2413/2006/angeo-24-2413-2006.pdf

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.