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arXiv 2007.14888astro-ph.SR
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非相干太阳射电辐射

Incoherent Solar Radio Emission

A. Nindos

摘要:

非相干太阳射电辐射来自自由-自由、回旋共振和回旋同步辐射机制。自由-自由主要由热电子和离子之间的库仑碰撞产生。回旋共振和回旋同步加速分别由低能电子和温和相对论性电子在磁场存在下的加速产生。在非耀斑太阳中,自由-自由是主要的发射机制,除了强磁场区域会发射微波回旋共振。由于其无处不在的存在,自由-自由发射可以用来探测温度最低以上的非耀斑太阳大气。回旋共振不透明度强烈依赖于磁场强度和方向,因此它提供了一个独特的工具,用于估计冠状磁场。回旋同步加速器是频率高于1-2 GHz的耀斑的主要发射机制,并取决于磁场和加速电子的性质以及周围等离子体的性质。在本文中,我们详细讨论了上述机制及其诊断潜力。

英文摘要:

Incoherent solar radio radiation comes from the free-free, gyroresonance, and gyrosynchrotron emission mechanisms. Free-free is primarily produced from Coulomb collisions between thermal electrons and ions. Gyroresonance and gyrosynchrotron result from the acceleration of low-energy electrons and mildly relativistic electrons, respectively, in the presence of a magnetic field. In the non-flaring Sun, free-free is the dominant emission mechanism with the exception of regions of strong magnetic fields which emit gyroresonance at microwaves. Due to its ubiquitous presence, free-free emission can be used to probe the non-flaring solar atmosphere above temperature minimum. Gyroresonance opacity depends strongly on the magnetic field strength and orientation; hence it provides a unique tool for the estimation of coronal magnetic fields. Gyrosynchrotron is the primary emission mechanism in flares at frequencies higher than 1-2 GHz and depends on the properties of both the magnetic field and the accelerated electrons, as well as the properties of the ambient plasma. In this paper we discuss in detail the above mechanisms and their diagnostic potential.

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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