NUMERICAL SIMULATIONS OF CHROMOSPHERIC MICROFLARES

NUMERICAL SIMULATIONS OF CHROMOSPHERIC MICROFLARES
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色球微耀斑的数值模拟

DOI:
10.1088/0004-637x/710/2/1387
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发表时间:
2010-02
影响因子:
4.9
通讯作者:
Chen, P. F.
Chen, P. F.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Jiang, R. L.;Fang, C.;Chen, P. F.

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在考虑重力、电离和辐射的情况下,利用CIP-MOCCT方案对色球磁场重联进行了2.5维(2.5维)可压缩电阻磁流体动力学(MHD)模拟。采用了静日大气模式VALC的温度分布和氦丰度(10%)。我们的2.5D MHD模拟再现了色球微耀斑中观察到的温度增强。温度增强ΔT对背景磁场敏感,而总演化时间Δt对异常电阻率的大小敏感。此外,我们还发现了一个标度律,它被描述为ΔT/Δt nH−1.5B2.1η00.88。结果还表明,向上射流的速度远大于向下射流的速度,X点可能向上移动,也可能向下移动。
With gravity, ionization, and radiation being considered, we perform 2.5 dimensional (2.5D) compressible resistive magnetohydrodynamic (MHD) simulations of chromospheric magnetic reconnection using the CIP-MOCCT scheme. The temperature distribution of the quiet-Sun atmospheric model VALC and the helium abundance (10%) are adopted. Our 2.5D MHD simulation reproduces qualitatively the temperature enhancement observed in chromospheric microflares. The temperature enhancement ΔT is demonstrated to be sensitive to the background magnetic field, whereas the total evolution time Δt is sensitive to the magnitude of the anomalous resistivity. Moreover, we found a scaling law, which is described as ΔT/Δt ∼ nH−1.5B2.1η00.88. Our results also indicate that the velocity of the upward jet is much greater than that of the downward jet, and the X-point may move up or down.
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影响因子: --
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