We report on a case study of the complex type II radio burst of 2012 January 19 and its association with a white light coronal mass ejection (CME). The complexity can be described as the appearance of an additional type II burst component and strong intensity variation. The dynamic spectrum shows a pair of type II bursts with fundamental harmonic structures, one confined to decameter-hectometric (DH) wavelengths and the other extending to kilometric (km) wavelengths. By comparing the speeds obtained from white-light images with that speed of the shock inferred from the drift rate, we show that the source of the short-lived DH component is near the nose.
T. Teklu, A. Gholap, N. Gopalswamy, et. al.
Wed, 1 Jun 16
Comments: 4 pages, 3 figures, contributed paper to be presented at the URSI Asia-Pacific Radio Science Conference in Seoul, August 21-25, 2016