Observations of quasi-periodic solar X-ray emission as a result of MHD oscillations in a system of multiple flare loops
Observations of quasi-periodic solar X-ray emission as a result of MHD oscillations in a system of multiple flare loops
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DOI：
10.1007/s11207-010-9518-3
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
I. Zimovets;A. Struminsky
中科院分区：
文献类型：
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作者：
I. Zimovets;A. Struminsky
我们研究了2002年10月20日的M1.8太阳耀斑。该耀斑伴随着RHESSI在3 ~ 50kev能量范围内观测到的热、非热硬x射线发射（HXR）的准周期脉动（QPP）。用Lomb周期图对不同能量通道的HXR时间谱进行了分析，发现了两个具有统计学意义的时间周期，分别为16 s和36 s。36s QPP仅在耀斑脉冲期的非热HXR发射中观测到。在耀斑脉冲期和衰减期的热、非热HXR发射中均发现了16 s QPP。对耀斑区域的成像分析、确定的QPP周期和估计的耀斑环的物理参数使我们能够根据两个空间分离但相互作用的耀斑环系统激发的MHD振荡来解释观测到的QPP。
We investigate the M1.8 solar flare of 20 October 2002. The flare was accompanied by quasi-periodic pulsations (QPP) of both thermal and nonthermal hard X-ray emissions (HXR) observed by RHESSI in the 3 – 50 keV energy range. Analysis of the HXR time profiles in different energy channels made with the Lomb periodogram has indicated two statistically significant time periods of about 16 and 36 s. The 36 s QPP were observed only in the nonthermal HXR emission in the impulsive phase of the flare. The 16 s QPP were found in thermal and nonthermal HXR emission both in the impulsive and in the decay phases of the flare. Imaging analysis of the flare region, the determined time periods of the QPP, and the estimated physical parameters of the flare loops allowed us to interpret the observed QPP in terms of MHD oscillations excited in two spatially separated, but interacting systems of flaring loops.