2005年1月15日太阳耀斑日震分析
Helioseismic analysis of the solar flare-induced sunquake of 2005 January 15
摘要:
我们报告的发现,最强大的日震之一检测到的日期,产生的X1.2级太阳耀斑在活动区10720在2005年1月15日。我们利用日震全息照相术对从耀斑现场发射到太阳内部的地震波源进行成像。声学出口功率图在3和6兆赫与2兆赫的带通揭示了一个紧凑的声源强烈相关的脉冲硬X射线和可见光连续发射沿半影中性线分离的两个主要的相对本影在$δ$配置的太阳黑子,占主导地位的AR 10720。声发射信号直接与耀斑期间发出的硬X射线和可见连续辐射对准。在$2.0 \times 10^{23}$ J估计的可见光连续发射,约500倍的地震发射的$\sim 4 \times 10^{20}$ J的耀斑2005年1月15日表现出相同的紧密的空间对齐之间的源的地震发射和脉冲可见光连续发射作为以前的耀斑,加强了假设,声发射可能是由加热低光球。然而,这是一个主要的例外,因为没有签名表明质子包含在被认为提供耀斑辐射能量的粒子束中。在缺乏质子的白光耀斑的情况下,地震发射源和脉冲可见连续发射源之间的持续强烈重合为"回暖“假说提供了实质性的支持,即低光球层被白光耀斑中上覆色球层的强烈巴耳末和帕邢连续边缘辐射显着加热。
英文摘要:
We report the discovery of one of the most powerful sunquakes detected to date, produced by an X1.2-class solar flare in active region 10720 on 2005 January 15. We used helioseismic holography to image the source of seismic waves emitted into the solar interior from the site of the flare. Acoustic egression power maps at 3 and 6 mHz with a 2 mHz bandpass reveal a compact acoustic source strongly correlated with impulsive hard X-ray and visible-continuum emission along the penumbral neutral line separating the two major opposing umbrae in the $δ$-configuration sunspot that predominates AR10720. The acoustic emission signatures were directly aligned with both hard X-ray and visible continuum emission that emanated during the flare. The visible continuum emission is estimated at $2.0 \times 10^{23}$ J, approximately 500 times the seismic emission of $\sim 4 \times 10^{20}$ J. The flare of 2005 January 15 exhibits the same close spatial alignment between the sources of the seismic emission and impulsive visible continuum emission as previous flares, reinforcing the hypothesis that the acoustic emission may be driven by heating of the low photosphere. However, it is a major exception in that there was no signature to indicate the inclusion of protons in the particle beams thought to supply the energy radiated by the flare. The continued strong coincidence between the sources of seismic emission and impulsive visible continuum emission in the case of a proton-deficient white-light flare lends substantial support to the ``back -- warming'' hypothesis, that the low photosphere is significantly heated by intense Balmer and Paschen continuum-edge radiation from the overlying chromosphere in white-light flares.
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