Fast Magnetoacoustic Waves in a Fan Structure Above a Coronal Magnetic Null Point
作者： M. Karlický , H. S. Sawant , F. R. H. Madsen , J. Dudík , H. Mészárosová
DOI: 10.1007/S11207-013-0243-6
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摘要: We analyze the 26 November 2005 solar radio event observed interferometrically at frequencies of 244 and 611 MHz by Giant Metrewave Radio Telescope (GMRT) in Pune, India. These observations are used to make interferometric maps both with time cadence 1 s from 06:50 07:12 UT. reveal several sources. The light curves these sources show that only two 244 MHz well correlated time. EUV flare is more localized loops located rather away Using SoHO/MDI potential magnetic field extrapolation we demonstrate fan structure lines starting a coronal null point. Wavelet analysis detects tadpoles periods range P=10 – 83 s. wavelet indicate presence fast magnetoacoustic waves propagate coronal estimate plasma parameters studied find them consistent presented scenario involving
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