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New evidence for a coronal mass ejection driven fast drifting type II radio burst by K. Ashnu et al.

3 Apr 2018, 10:09 UTC
New evidence for a coronal mass ejection driven fast drifting type II radio burst  by K. Ashnu et al.
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Type II solar radio bursts are considered to originate from plasma waves excited by magnetohydrodynamic (MHD) shocks and converted into radio waves at the local plasma frequency and its harmonics. Type II radio bursts are mostly associated with coronal mass ejections (CMEs) and flares Nindos et al. (2008). We studied a seldom occurring high frequency type II burst on 4th Novemeber 2015, which had both fundamental and harmonic components. The fundamental and harmonic had start frequency $\approx$ 220 MHz and $\approx$ 440 MHz, respectively. We used X-ray, radio and extreme ultraviolet (EUV) data to study the spatio-temporal correlation between the X-ray flux, type II burst, CME and EUV wavefront.
The radio imaging and spectral observations were carried out with GRAPH (Ramesh et al. (1998)) and GRASP (Kishore et al. (2015)). The EUV and white-light coronagraph data was obtained with SDO/AIA (Lemen et al. (2012)) instrument and SOHO/LASCO-C2 (Bruecker et al. (1995)). The X-ray data used was obtained with GOES_15/XRS (Chamberlin et al. (2009)) and ASTROSAT/SSM (Seetha et al. (2006)). We made a composite image in three different wavelengths, i.e EUV 171 Angstrom at 3:26 UT (peak time of the X-ray flare), radio contours at 80 MHz at 3:31 UT (Type ...

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