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).
|
PDF
sol_phy_296-04_2021.pdf - Published Version Download (2MB) | Preview |
Abstract
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 |
Actions (login required)
 |
View Item |
