Seismic Emission from A M9.5-Class Solar Flare
Seismic Emission from A M9.5-Class Solar Flare
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DOI：
10.1007/s11207-006-0108-3
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发表时间：
2006-11
期刊：
影响因子：
2.8
通讯作者：
A. Donea;D. Besliu-Ionescu;P. Cally;C. Lindsey;V. Zharkova
中科院分区：
文献类型：
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作者：
A. Donea;D. Besliu-Ionescu;P. Cally;C. Lindsey;V. Zharkova
在2003年10月28日和29日的大耀斑中发现了一些6.0 mHz的重要震源后，我们将SOHO/MDI日震观测扩展到了中等M级耀斑。本文报道了2001年9月9日从NOAA 9608 β γ δ活动区发射的地震波的探测结果。20：40 ~ 20：48 UT发生了一次相当强烈的M9.5型耀斑。我们使用日震全息成像的地震辐射从这个耀斑到太阳内部和计算的时间序列在2.0兆赫频段的出口功率图集中在3.0和6.0兆赫。6.0 mHz图像显示了与耀斑相关的声源，东西方向约30 Mm，南北方向约15 Mm，位于AR 9608主黑子的南部半影区。这与太阳黑子半影中出现的三个白光耀斑核心非常吻合。白光和声发射之间的密切空间对应关系增加了相当大的重量的假设，即声发射是由加热较低的光球。这是进一步支持的一个粗略的流体力学模型的声学瞬态驱动的突然加热的低光球。在低光球层被质子或高能电子直接加热是不现实的地方，声源和同空间连续辐射之间的强烈关联可以被视为支持回暖假说的证据，其中低光球层被来自上覆色球层的辐射加热。这就是说，一个地震源与可见连续光谱中强烈的、突然的辐射发射相一致，表明光球被充分加热，从而对观测到的连续辐射有显著的贡献。
Following the discovery of a few significant seismic sources at 6.0 mHz from the large solar flares of October 28 and 29, 2003, we have extended SOHO/MDI helioseismic observations to moderate M-class flares. We report the detection of seismic waves emitted from theβ γ δactive region NOAA 9608 on September 9, 2001. A quite impulsive solar flare of type M9.5 occurred from 20:40 to 20:48 UT. We used helioseismic holography to image seismic emission from this flare into the solar interior and computed time series of egression power maps in 2.0 mHz bands centered at 3.0 and 6.0 mHz. The 6.0 mHz images show an acoustic source associated with the flare some 30 Mm across in the East – West direction and 15 Mm in the North – South direction nestled in the southern penumbra of the main sunspot of AR 9608. This coincides closely with three white-light flare kernels that appear in the sunspot penumbra. The close spatial correspondence between white-light and acoustic emission adds considerable weight to the hypothesis that the acoustic emission is driven by heating of the lower photosphere. This is further supported by a rough hydromechanical model of an acoustic transient driven by sudden heating of the low photosphere. Where direct heating of the low photosphere by protons or high-energy electrons is unrealistic, the strong association between the acoustic source and co-spatial continuum emission can be regarded as evidence supporting the back-warming hypothesis, in which the low photosphere is heated by radiation from the overlying chromosphere. This is to say that a seismic source coincident with strong, sudden radiative emission in the visible continuum spectrum indicates a photosphere sufficiently heated so as to contribute significantly to the continuum emission observed.