首页|Signature of high-order azimuthal MHD body modes in sunspot's low atmosphere
Signature of high-order azimuthal MHD body modes in sunspot's low atmosphere
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The five-minute oscillations inside sunspots appear to be the absorption of the solar p-mode.It is a potential tool to probe a sunspot's sub-structure.We studied the collective properties of five-minute oscillations in the power and phase distribution at the sunspot's umbra-penumbra boundary.The azimuthal distributions of the power and phase of five-minute oscillations enclosing a sunspot's umbra were obtained with images taken with the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA).The azimuthal modes were quantified with periodogram analysis and justified with significance tests.The azimuthal nodal structures in an approximately axially symmetric sunspot AR 11131 (2010 Dec 08) were investigated.Mode numbers m =2,3,4,7,10 were obtained in both 1700 (A) and 1600(A) bandpasses.The 1600(A) channel also revealed an extra mode at m =9.In the upper atmosphere (304(A)),fewer modes were detected at m =3,4,7.The azimuthal modes in the sunspot's low atmosphere could be interpreted as high-order azimuthal MHD body modes.They were detected in the power and phase of the five-minute oscillations in sunspot AR 11131 with SDO/AIA data.Fewer modes were detected in the sunspot's upper atmosphere.
Sun: atmosphereSun: UV radiationSun: sunspots
Ding Yuan
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Centre for mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven,Celestijnenlaan 200B bus 2400, B-3001 Leuven, Belgium
NETL
NSTL
万方数据
维普
