Properties of Flares-Generated Seismic Waves on the Sun
Properties of Flares-Generated Seismic Waves on the Sun
复制标题
太阳上耀斑产生的地震波的特性
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
A. Kosovichev
中科院分区：
文献类型：
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作者：
A. Kosovichev
由太阳耀斑激发的日震波（“日震”）被观测为太阳表面上的圆形膨胀波。1996年7月9日，太阳和日光层观测站（SOHO）空间使命观测到了第一次太阳地震。本文介绍了2003 - 2005年四次太阳耀斑日震波的新观测结果，并对日震波的基本性质进行了详细的定性分析。对于其中的两次耀斑，即2003年10月28日的X17耀斑和2005年1月15日的X1.2耀斑，将日震学观测结果与RHESSI卫星测量的耀斑X射线通量的同时观测结果进行了比较。这些观测结果表明耀斑地震波和硬X射线源之间存在密切联系，表明在耀斑脉冲阶段加速的高能电子在光球中产生了强烈的压缩波，导致了太阳地震。结果还揭示了新的物理特性，如地震波的强各向异性，其振幅随传播方向的变化显着。波通过周围的太阳黑子区域传播到很远的距离，可达120 Mm，没有明显的扭曲。这些观测为太阳耀斑活动区的日震诊断和理解太阳耀斑能量释放和传输的机制开辟了新的视角。
The helioseismic waves excited by solar flares (“sunquakes”) are observed as circular, expanding waves on the Sun’s surface. The first sunquake was observed for a flare on July 9, 1996, by the Solar and Heliospheric Observatory (SOHO) space mission. This paper presents results of new observations and a detailed qualitative analysis of the basic properties of the helioseismic waves generated by four solar flares in 2003 – 2005. For two of these flares, the X17 flare of October 28, 2003, and the X1.2 flare of January 15, 2005, the helioseismology observations are compared with simultaneous observations of flare X-ray fluxes measured from the RHESSI satellite. These observations show a close association between the flare seismic waves and the hard X-ray source, indicating that high-energy electrons accelerated during the flare impulsive phase produced strong compression waves in the photosphere, causing the sunquake. The results also reveal new physical properties such as strong anisotropy of the seismic waves, the amplitude of which varies significantly with the direction of propagation. The waves travel through surrounding sunspot regions to large distances, up to 120 Mm, without significant distortion. These observations open new perspectives for helioseismic diagnostics of flaring active regions on the Sun and for understanding the mechanisms of the energy release and transport in solar flares.