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Imaging and Spectral Observations of a Type-II Radio Burst Revealing the Section of the CME-Driven Shock That Accelerates Electrons

Majumdar, S and Tadepalli, SP and Maity, SS and Deshpande, K and Kumari, A and Patel, R and Gopalswamy, N (2021) Imaging and Spectral Observations of a Type-II Radio Burst Revealing the Section of the CME-Driven Shock That Accelerates Electrons. In: Solar Physics, 296 (4).

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Official URL: https://doi.org/10.1007/s11207-021-01810-8


We report on a multi-wavelength analysis of the 26 January 2014 solar eruption involving a coronal mass ejection (CME) and a Type-II radio burst, performed by combining data from various space and ground-based instruments. An increasing standoff distance with height shows the presence of a strong shock, which further manifests itself in the continuation of the metric Type-II burst into the decameter�hectometric (DH) domain. A plot of speed versus position angle (PA) shows different points on the CME leading edge traveled with different speeds. From the starting frequency of the Type-II burst and white-light data, we find that the shock signature producing the Type-II burst might be coming from the flanks of the CME. Measuring the speeds of the CME flanks, we find the southern flank to be at a higher speed than the northern flank; further the radio contours from Type-II imaging data showed that the burst source was coming from the southern flank of the CME. From the standoff distance at the CME nose, we find that the local Alfv�en speed is close to the white-light shock speed, thus causing the Mach number to be small there. Also, the presence of a streamer near the southern flank appears to have provided additional favorable conditions for the generation of shock-associated radio emission. These results provide conclusive evidence that the Type-II emission could originate from the flanks of the CME, which in our study is from the southern flank of the CME. © 2021, The Author(s), under exclusive licence to Springer Nature B.V.

Item Type: Journal Article
Publication: Solar Physics
Publisher: Springer Science and Business Media B.V.
Additional Information: The copyright for this article belongs to Author
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 13 Jul 2021 10:25
Last Modified: 13 Jul 2021 10:25
URI: http://eprints.iisc.ac.in/id/eprint/68802

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