EFFECT OF SOLAR CHROMOSPHERIC NEUTRALS ON EQUILIBRIUM FIELD STRUCTURES
EFFECT OF SOLAR CHROMOSPHERIC NEUTRALS ON EQUILIBRIUM FIELD STRUCTURES
复制标题
太阳色球中性子对平衡场结构的影响
DOI：
10.1088/0004-637x/705/2/1183
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Arber T
中科院分区：
文献类型：
--
作者：
Arber T
日冕平衡场通常由光球层磁图的非线性无力场(NLFFF)外推而成。众所周知，光球场并不是无作用力的，NLFFF结构的正确下限应该是色球的顶部。为了补偿这一点，通常对光球数据应用预滤波算法来去除非力自由分量。这种预过滤模型虽然受到物理上的限制，但并不涉及可能导致场变得无力场的机制。例如，由于重力分层、重联或磁通出现，色球场可以通过场扩展而改变。本文研究和量化了色球中性子对平衡场结构的影响。结果表明，根据光球场不是无力场的程度，色球会改变平衡场的结构。这是量化的，以给出一个由于色球中的中性粒子而可能预期的α分布变化的估计。文中还给出了色球中性物引起的磁场中非无力分量衰减时间的简单标度。这是用来量化的速率，或相当于什么高度，色球预计成为无作用力。
Solar coronal equilibrium fields are often constructed by nonlinear force-free field (NLFFF) extrapolation from photospheric magnetograms. It is well known that the photospheric field is not force-free and the correct lower boundary for NLFFF construction ought to be the top of the chromosphere. To compensate for this, pre-filtering algorithms are often applied to the photospheric data to remove the non-force-free components. Such pre-filtering models, while physically constrained, do not address the mechanisms that may be responsible for the field becoming force-free. The chromospheric field can change through, for example, field expansion due to gravitational stratification, reconnection, or flux emergence. In this paper, we study and quantify the effect of the chromospheric neutrals on equilibrium field structures. It is shown that, depending on the degree to which the photospheric field is not force-free, the chromosphere will change the structure of the equilibrium field. This is quantified to give an estimate of the change in α profiles one might expect due to neutrals in the chromosphere. Simple scaling of the decay time of non-force-free components of the magnetic field due to chromospheric neutrals is also derived. This is used to quantify the rate at which, or equivalent at which height, the chromosphere is expected to become force-free.
影响因子：
2.8
作者：
T. Wiegelmann;J. Thalmann;C. Schrijver;M. DeRosa;T. Metcalf
通讯作者：
T. Wiegelmann;J. Thalmann;C. Schrijver;M. DeRosa;T. Metcalf
太阳及其他太阳型恒星色球网络加热机制及其发生条件
DOI：
10.1086/308635
发表时间：
2000
期刊：
The Astrophysical Journal
影响因子：
--
作者：
M. L. Goodman
通讯作者：
M. L. Goodman