High-energy gamma-ray emission from pion decay in a solar flare magnetic loop
High-energy gamma-ray emission from pion decay in a solar flare magnetic loop
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太阳耀斑磁环中π介子衰变产生的高能伽马射线发射
DOI：
10.1086/171247
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
R. Ramaty
中科院分区：
文献类型：
--
作者：
N. Mandzhavidze;R. Ramaty
本文研究了太阳耀斑磁环中π介子衰变产生的高能γ射线。磁镜，磁流体俯仰角散射，以及所有相关的损失过程和光子产生机制都考虑在内。考虑了正π子衰变产生的一次离子和二次正电子的输运，以及产生的γ射线发射的输运。计算了伽马射线随大气深度、时间、发射角和光子能量的分布，并研究了这些分布对模型参数的依赖关系。所得到的角分布是不充分的各向异性占观察到的肢体增亮大于10 MeV的耀斑发射，这表明该发射的大部分是初电子的韧致辐射。
The production of high-energy gamma rays resulting from pion decay in a solar flare magnetic loop is investigated. Magnetic mirroring, MHD pitch-angle scattering, and all of the relevant loss processes and photon production mechanisms are taken into account. The transport of both the primary ions and the secondary positrons resulting from the decay of the positive pions, as well as the transport of the produced gamma-ray emission are considered. The distributions of the gamma rays as a function of atmospheric depth, time, emission angle, and photon energy are calculated and the dependence of these distributions on the model parameters are studied. The obtained angular distributions are not sufficiently anisotropic to account for the observed limb brightening of the greater than 10 MeV flare emission, indicating that the bulk of this emission is bremsstrahlung from primary electrons.