arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1109.6629astro-ph.SRphysics.ao-phphysics.plasm-phphysics.space-ph
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太阳射电与硬X射线发射的关系

The Relationship Between Solar Radio and Hard X-ray Emission

Stephen M. White, Arnold O. Benz, Steven Christe, Frantisek Farnik, Mukul R. Kundu, Gottfried Mann, Zongjun Ning, Jean-Pierre Raulin, Adriana V. R. Silva-Valio,… 展开作者

Stephen M. White, Arnold O. Benz, Steven Christe, Frantisek Farnik, Mukul R. Kundu, Gottfried Mann, Zongjun Ning, Jean-Pierre Raulin, Adriana V. R. Silva-Valio, Pascal Saint-Hilaire, Nicole Vilmer, Alexander Warmuth

摘要:

这篇评论讨论了无线电和硬X射线观测太阳之间的互补关系,主要使用的结果,从时代的Ramaty高能量太阳光谱成像卫星。对太阳耀斑进行无线电和硬X射线联合研究的一个主要重点是利用无线电波长的非热回旋同步辐射和韧致辐射硬X射线的观测来研究在主耀斑地点加速的电子的性质,因为已经确定这两种辐射表现出非常相似的时间行为。给出了一个定量的处方,分别来自两个波长范围内的电子能量分布进行比较:这是一个重要的应用与测量的磁场强度在耀斑区域的潜力,并揭示了显着的差异,在不同的能量范围内的电子。然后讨论了使用两个波长范围的同时数据来推导物理条件的例子,包括微耀斑的情况,并介绍了无线电和硬X射线波长的图像比较。在毫米波和亚毫米波波段观测太阳耀斑得到了一些令人困惑的结果,本文将这些结果与相应的硬X射线数据进行了比较。最后,审查讨论了关联的硬X射线释放与无线电发射在分米和米波长,这是占主导地位的等离子体发射(在较低的频率)和电子回旋脉泽发射(在较高的频率),这两个相干发射机制,需要少量的高能电子。这些比较显示了广泛的一般关联,但详细的对应关系仍然更加难以捉摸。

英文摘要:

This review discusses the complementary relationship between radio and hard X-ray observations of the Sun using primarily results from the era of the Reuven Ramaty High Energy Solar Spectroscopic Imager satellite. A primary focus of joint radio and hard X-ray studies of solar flares uses observations of nonthermal gyrosynchrotron emission at radio wavelengths and bremsstrahlung hard X-rays to study the properties of electrons accelerated in the main flare site, since it is well established that these two emissions show very similar temporal behavior. A quantitative prescription is given for comparing the electron energy distributions derived separately from the two wavelength ranges: this is an important application with the potential for measuring the magnetic field strength in the flaring region, and reveals significant differences between the electrons in different energy ranges. Examples of the use of simultaneous data from the two wavelength ranges to derive physical conditions are then discussed, including the case of microflares, and the comparison of images at radio and hard X-ray wavelengths is presented. There have been puzzling results obtained from observations of solar flares at millimeter and submillimeter wavelengths, and the comparison of these results with corresponding hard X-ray data is presented. Finally, the review discusses the association of hard X-ray releases with radio emission at decimeter and meter wavelengths, which is dominated by plasma emission (at lower frequencies) and electron cyclotron maser emission (at higher frequencies), both coherent emission mechanisms that require small numbers of energetic electrons. These comparisons show broad general associations but detailed correspondence remains more elusive.

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