Abstract
We report ground-based radio spectral and polarimeter observations of two successive split-band Type-II bursts that occurred on 20 February 2014 at low frequencies (\({<}\,100~\mbox{MHz}\)) in association with a solar coronal mass ejection (CME). The temporal interval between the onset of the two bursts was very small, ≈ one minute. Both of the bursts exhibited fundamental–harmonic structure. The coronal magnetic-field strength [\(B\)] in the upstream region of the associated magnetohydrodynamic (MHD) shock, estimated from the split-band observations, is in the range \(B \approx1.3\,\mbox{--}\,1.1~\mbox{G}\) over the radial distance [\(r\)] interval \(r \approx1.49\,\mbox{--}\,1.58~\mbox{R}_{\odot}\) for the first Type-II burst, and \(B \approx1.3\,\mbox{--}\,1.0~\mbox{G}\) over \(r \approx1.49\,\mbox{--}\,1.64~\mbox{R}_{\odot}\) for the second Type-II burst. Based on the results obtained, we show that the first and the second Type-II bursts in the present case were likely due to MHD shocks generated by the near-simultaneous interaction of two different regions of the aforementioned CME with a preceding CME and a pre-existing coronal streamer.
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Acknowledgements
We would like to thank the staff of the Gauribidanur Observatory for their help in observations, maintenance of the antenna and receiver systems there. We also thank the referee whose comments helped us to present our results more clearly. The SOHO/LASCO CME catalog and STEREO movies are generated and maintained at the CDAW Data Center by NASA and the Catholic University of America in cooperation with the Naval Research Laboratory.
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Radio Heliophysics: Science and Forecasting
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Hariharan, K., Ramesh, R. & Kathiravan, C. Observations of Near-Simultaneous Split-Band Solar Type-II Radio Bursts at Low Frequencies. Sol Phys 290, 2479–2489 (2015). https://doi.org/10.1007/s11207-015-0761-5
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DOI: https://doi.org/10.1007/s11207-015-0761-5