Solar Magnetic Carpet III: Coronal Modelling of Synthetic Magnetograms

Solar Magnetic Carpet III: Coronal Modelling of Synthetic Magnetograms
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太阳磁毯 III:合成磁图的日冕建模

DOI:
10.1007/s11207-013-0272-1
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发表时间:
2013
期刊:
影响因子:
2.8
通讯作者:
Meyer K
Meyer K
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Meyer K

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这篇文章是系列文章中的第三篇,致力于为太阳磁毯构建一个现实的、不断发展的、非线性的无力日冕场模型。在这里,我们提出了初步的结果,三维随时间变化的模拟的小尺度日冕磁场的磁地毯。四个模拟被认为是相同的不断发展的光球边界条件:48小时的时间序列的合成磁图从模型的Meyeret等人。(Solar Phys.272,29,2011)。三个模拟包括一个均匀的,覆盖不同强度的日冕磁场,第四个模拟不包括覆盖场。建立,存储和耗散的模拟内的磁能进行了研究。特别是,我们研究了它们对光球磁场的演化和上覆日冕磁场强度的依赖。我们还考虑了能量在日冕场中的储存和耗散。自由磁能的建立被发现是足够的动力小规模,瞬态现象,如纳米火花和X射线亮点,与大部分的自由能被发现存储在低下来,在0.5 - 0.8微米。目前发现,耗散的能量太小,无法解释整个安静太阳日冕的加热。然而,能量耗散区域的形式和位置在质量上与太阳上小尺度上观察到的一致。未来的MHD模型使用相同的合成磁图可能会导致更高的能量释放。
This article is the third in a series working towards the construction of a realistic, evolving, non-linear force-free coronal-field model for the solar magnetic carpet. Here, we present preliminary results of 3D time-dependent simulations of the small-scale coronal field of the magnetic carpet. Four simulations are considered, each with the same evolving photospheric boundary condition: a 48-hour time series of synthetic magnetograms produced from the model of Meyeret al.(Solar Phys.272, 29, 2011). Three simulations include a uniform, overlying coronal magnetic field of differing strength, the fourth simulation includes no overlying field. The build-up, storage, and dissipation of magnetic energy within the simulations is studied. In particular, we study their dependence upon the evolution of the photospheric magnetic field and the strength of the overlying coronal field. We also consider where energy is stored and dissipated within the coronal field. The free magnetic energy built up is found to be more than sufficient to power small-scale, transient phenomena such as nanoflares and X-ray bright points, with the bulk of the free energy found to be stored low down, between 0.5 – 0.8 Mm. The energy dissipated is currently found to be too small to account for the heating of the entire quiet-Sun corona. However, the form and location of energy-dissipation regions qualitatively agree with what is observed on small scales on the Sun. Future MHD modelling using the same synthetic magnetograms may lead to a higher energy release.
DOI: 10.1088/0004-637x/710/2/1480
发表时间: 2009-12
期刊: The Astrophysical Journal
影响因子: --
作者:
C. Schrijver
通讯作者: C. Schrijver
DOI: 10.1007/s11207-011-9809-3
发表时间: 2011
期刊: Solar Physics
影响因子: 2.8
作者:
Meyer K
通讯作者: Meyer K
DOI: 10.1088/0004-637x/705/1/347
发表时间: 2009
期刊: The Astrophysical Journal
影响因子: --
作者:
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通讯作者: M. Asgari
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DOI: --
发表时间: 1989
期刊:
影响因子: --
作者:
Haimin Wang;H. Zirin
通讯作者: H. Zirin
DOI: 10.1086/303528
发表时间: 1997-01
期刊: The Astrophysical Journal
影响因子: --
作者:
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通讯作者: C. Schrijver;H. Hagenaar;A. Title