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Quasi-Periodic Radio Bursts Associated with Fast-mode Waves near a Magnetic Null Point View all abstracts by submitter

Pankaj Kumar   Submitted: 2017-07-05 13:05

This paper presents an observation of quasi-periodic rapidly-propagating waves observed in the AIA 171/193 Å channels during the impulsive phase of an M1.9 flare occurred on 7 May 2012. The instant period was found to decrease from 240 s to 120 s, the speed of the wave fronts was in the range of ~664-1416 km s-1. Almost simultaneously, quasi-periodic bursts with similar instant periods, ~70 s and ~140 s, occur in the microwave emission and in decimetric type IV, and type III radio bursts, and in the soft X-ray emission. The magnetic field configuration of the flare site was consistent with a breakout topology, i.e., a quadrupolar field along with a magnetic null point. The quasi-periodic rapidly-propagating wavefronts of the EUV emission are interpreted as a fast magnetoacoustic wave train. The observations suggest that the fast-mode waves are generated during the quasi-periodic magnetic reconnection in the cusp-region above the flare arcade loops. For the first time, we provide the evidence of a tadpole wavelet signature at about 70-140 s in decimetric (245/610~MHz) radio bursts, along with the direct observation of a coronal fast-mode wave train in EUV. In addition, at AIA 131/193 Å we observed quasi-periodic EUV disturbances with the periods of 95 s and 240 s propagating downward at the apparent speed of 172-273 km s-1. The nature of these downward propagating disturbances is not revealed, but they could be connected with magnetoacoustic waves or periodically shrinking loops.

Authors: Kumar, Pankaj; Nakariakov, Valery M.; Cho, Kyung-Suk
Projects: None

Publication Status: ApJ (in press)
Last Modified: 2017-07-06 10:45
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