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arXiv 0801.0898astro-ph
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高脉冲M6 .7太阳耀斑的地震辐射

Seismic Emissions from a Highly Impulsive M6.7 Solar Flare

J. C. Martinez-Oliveros, H. Moradi, A-C. Donea

摘要:

2001年3月10日,活动区NOAA 9368在太阳边缘附近产生了一个异常脉冲的太阳耀斑。这个耀斑之前已经被详细研究过,观测将其归类为1型白光耀斑,在硬X射线中具有非常硬的光谱。耀斑还与II型射电爆发和日冕物质抛射有关。耀斑的发射特性似乎密切对应于以前的情况下,地震发射的声学活动耀斑。使用标准的本地日震方法,我们确定了地震信号产生的耀斑,到目前为止,是能量最低的耀斑(在软X射线)已知已产生可检测的声学瞬态。耀斑的全息分析表明,一个紧凑的声源强相关的脉冲硬X射线,可见光连续谱,和无线电发射。从耀斑区发出的地震波的时距图也显示出微弱的特征,主要是在活动区的东部。震源和脉冲可见光连续辐射之间强烈的空间重合加强了这样一种理论,即所看到的地震辐射的一个重要组成部分是与所观察到的可见光连续辐射相关的低光球层突然加热的结果。此外,低海拔磁回路结构推断位-场外推在耀斑区域表明,有一个显着的反相关性之间的地震活动的耀斑和高度的磁回路进行的粒子束从日冕。

英文摘要:

On 10 March 2001 the active region NOAA 9368 produced an unusually impulsive solar flare in close proximity to the solar limb. This flare has previously been studied in great detail, with observations classifying it as a type 1 white-light flare with a very hard spectrum in hard X-rays. The flare was also associated with a type II radio burst and coronal mass ejection. The flare emission characteristics appeared to closely correspond with previous instances of seismic emission from acoustically active flares. Using standard local helioseismic methods, we identified the seismic signatures produced by the flare that, to date, is the least energetic (in soft X-rays) of the flares known to have generated a detectable acoustic transient. Holographic analysis of the flare shows a compact acoustic source strongly correlated with the impulsive hard X-ray, visible continuum, and radio emission. Time-distance diagrams of the seismic waves emanating from the flare region also show faint signatures, mainly in the eastern sector of the active region. The strong spatial coincidence between the seismic source and the impulsive visible continuum emission reinforces the theory that a substantial component of the seismic emission seen is a result of sudden heating of the low photosphere associated with the observed visible continuum emission. Furthermore, the low-altitude magnetic loop structure inferred from potential--field extrapolations in the flaring region suggests that there is a significant inverse correlation between the seismicity of a flare and the height of the magnetic loops that conduct the particle beams from the corona.

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