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arXiv 1010.0063astro-ph.SR
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太阳耀斑中的振荡过程

Oscillatory processes in solar flares

V. M. Nakariakov, A. R. Inglis, I. V. Zimovets, C. Foullon, E. Verwichte, R. Sych, I. N. Myagkova

摘要:

太阳和恒星耀斑产生的电磁(无线电、可见光、紫外线、极紫外线、X射线和伽马射线)辐射通常包含明显的准周期脉动(QPP)。产生长周期QPP(周期大于1秒)的物理机制可能与MHD过程有关。观测到的QPP的调制深度、周期和非谐性表明,它们可能与某种MHD自振荡有关,例如磁重联的振荡机制。这种制度,自发和诱导的性质,已被观察到连续MHD数值模拟。振荡本质上是非线性和非平稳的。我们证明了一个有前途的新方法,他们的分析是经验模态分解技术。

英文摘要:

Electromagnetic (radio, visible-light, UV, EUV, X-ray and gamma-ray) emission generated by solar and stellar flares often contains pronounced quasi-periodic pulsations (QPP). Physical mechanisms responsible for the generation of long-period QPP (with the periods longer than one second) are likely to be associated with MHD processes. The observed modulation depths, periods and anharmonicity of QPP suggest that they can be linked with some kind of MHD auto-oscillations, e.g. an oscillatory regime of magnetic reconnection. Such regimes, of both spontaneous and induced nature, have been observed in resistive-MHD numerical simulations. The oscillations are essentially nonlinear and non-stationary. We demonstrate that a promising novel method for their analysis is the Empirical Mode Decomposition technique.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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