The slow magnetoacoustic mode in the flaring loop

Details The slow magnetoacoustic mode in the flaring loop The slow magnetoacoustic mode in the flaring loop

2011-10-06

arxiv.org/abs/1110.1136v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

The 11th Asian-Pacific Regional IAU Meeting 2011

Scientific paper

We studied long duration flare observed with Nobeyama Radioheliograph at frequencies 17 and 34 GHz and with Ramaty High Energy Solar Spectroscopic Imager at 25-50 keV. We found that microwave and hard X-ray emission variation contain well-pronounced periodicity with the oscillation period growing from 2.5 to 5 min. Analysis of the loop length and plasma temperature evolution during the flare allowed to interpret the quasi-periodic pulsations in terms of the second standing harmonics of the slow magnetoacoustic mode. This mode can be generated by the initial impulsive energy release and work as a trigger for the repeated energy releases.

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