SUNQUAKE GENERATION BY CORONAL MAGNETIC RESTRUCTURING
SUNQUAKE GENERATION BY CORONAL MAGNETIC RESTRUCTURING
复制标题
日冕磁力重组产生的日震
DOI：
10.3847/0004-637x/831/1/42
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
H. Hudson
中科院分区：
文献类型：
--
作者：
A. Russell;M. Mooney;J. Leake;H. Hudson
太阳地震是太阳内部声波的表面特征，这些声波是由一些但不是全部的耀斑和日冕物质抛射（cme）产生的。本文探讨了在耀斑和日冕抛射期间发生的磁场变化产生地震的机制，利用半经验FAL-C大气的MHD模拟来证明声波在日冕磁场倾斜变化的响应中在内部产生。我们发现，在日冕场强在几百高斯以上的区域，当磁场角变化10°左右时，与质动势相结合的alfvsamn - sound共振在内部产生的声波具有足够的能量与地震观测相匹配。高能地震发生在日冕磁场较强的时候，而磁场强度随高度的变化和倾斜变化的时间尺度则是次要的。
Sunquakes are the surface signatures of acoustic waves in the Sun’s interior that are produced by some but not all flares and coronal mass ejections (CMEs). This paper explores a mechanism for sunquake generation by the changes in magnetic field that occur during flares and CMEs, using MHD simulations with a semiempirical FAL-C atmosphere to demonstrate the generation of acoustic waves in the interior in response to changing magnetic tilt in the corona. We find that Alfvén–sound resonance combined with the ponderomotive force produces acoustic waves in the interior with sufficient energy to match sunquake observations when the magnetic field angle changes of the order of 10° in a region where the coronal field strength is a few hundred gauss or more. The most energetic sunquakes are produced when the coronal field is strong, while the variation of magnetic field strength with height and the timescale of the change in tilt are of secondary importance.
DOI：
10.1088/0004-637x/695/2/1151
发表时间：
2009-04
期刊：
The Astrophysical Journal
影响因子：
--
作者：
J. Birn;L. Fletcher;M. Hesse;T. Neukirch
通讯作者：
J. Birn;L. Fletcher;M. Hesse;T. Neukirch