Multiwavelength Analysis of a Moving Type-IV Radio Burst on 4th March 2012

Abstract:

We performed a multiwavelength analysis of a moving Type-IV radio burst on 4^th march 2012. The Type-IV radio burst is observed between 10:39 – 11:00 UT in the frequency range of 300 – 20 MHz. From the radio heliographic observation, the radio source of the type-IV burst is traced and their sky plane speed is estimated as ~ 370 km/s. A plasmoid structure is ejected during the impulsive phase of the flare, at the same time of the type-IV burst and the structure is clearly observed at SDO/AIA 131 Å channel. From this, we find that the radio source moves with the plasmoid. The high brightness temperature profile in the range of 10⁸ – 10⁹ K and the moderate polarization between -50 – 30 % supports the plasma emission mechanism. Further the differential emission measure (DEM) analysis will be carried out and their results will be presented to provide more evidence of the emission mechanism.