On the Seismicity of September 7, 2011 X1.8-class Flare

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Zharkov, S.^1,2 ; Green, L.M.^2 ; Matthews, S.A.^2 ; Zharkova, V.V.^3

Department of Physics and Mathematics, University of Hull, Cottingham Road, Kingston-upon-Hull HU6 7RX, United Kingdom^1

Mullard Space Science Laboratory, University College London, Dorking, Holmbury St. Mary RH5 6NT, United Kingdom^2

Department of Mathematics, University of Bradford, Bradford BD7 1DP, United Kingdom^3

关键词: Acoustic sources;    Active X;    Directional information;    Preliminary analysis;    Strong magnetic fields;    Time distance;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012046/pdf
DOI  :  10.1088/1742-6596/440/1/012046

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We present results of our preliminary analysis of acoustically active X-class flare of September 7, 2011. We report two acoustic sources detected via acoustic holography and verified by finding a ridge in time-distance diagrams. We compare the directional information extracted from time-distance and acoustic holography, showing a good agreement in this case. We report that the direction where amplitude of the wave-front is the largest lies through the strong magnetic field and sunspot, suggesting that absorption of the acoustic wave power by magnetic field can be ruled out as a wave anisotropy mechanism in this case.