A hydrodynamic model of the gradual phase of the solar flare loop
A hydrodynamic model of the gradual phase of the solar flare loop
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DOI：
10.1086/168989
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发表时间：
1990-07
期刊：
影响因子：
--
通讯作者：
W. Gan;C. Fang
中科院分区：
文献类型：
--
作者：
W. Gan;C. Fang
对太阳耀斑最大阶段后的流体动力冷却过程进行了数值模拟，改进了色球辐射损失和过渡区分辨率，并引入了日冕软X射线加热色球的机制。渐变阶段初期，色球蒸发持续发生，过渡区进一步向下移动。在渐变阶段的中期，日冕大气出现准周期振荡，过渡区长期保持在同一位置。渐变阶段后期至后期，日冕物质不再下降，大气演化为高密度、低温状态。最后，大气层不会直接达到安静太阳条件，它可能会经历一个不稳定的过程，发展到后耀斑环路阶段。还讨论了耀斑软 X 射线加热色球层的效率。 43 参考文献
The hydrodynamic cooling process after the maximum phase of a solar flare has been simulated numerically, with improvements on the chromospheric radiative loss and the resolution of the transition region, together with the introduction of the mechanism of chromospheric heating by coronal soft X-rays. At the early stage of the gradual phase, chromospheric evaporation continues to take place and the transition region moves further downward. At the middle stage of the gradual phase, the corona atmosphere appears to have a quasi-periodic oscillation, and the transition region remains at the same position for a long time. At the later stage to of the gradual phase, the descent of coronal material does not happen, and the atmosphere evolves into a state with high density and low temperature. Finally, the atmosphere does not reach the quiet-sun conditions directly, and it would perhaps undergo a process of instability and develop into the stage of postflare loop. The efficiency of flare soft X-ray heating of the chromosphere is also discussed. 43 refs.