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

• Main Authors: Jones, R. A., Breen, A. R., Fallows, R. A., Bisi, M. M., Thomasson, P., Wannberg, G., Jordan, C. A.
• Other Authors: Institute of Mathematical and Physical Sciences, Jodrell Bank Observatory, University of Manchester Manchester, EISCAT Scientific Association
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2006
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; EISCAT
• Online Access: https://hal.science/hal-00318169; https://hal.science/hal-00318169/document; https://hal.science/hal-00318169/file/angeo-24-2413-2006.pdf

International audience 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.