FIP Fractionation: Theory
FIP Fractionation: Theory
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FIP 分级：理论
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
J. Hénoux
中科院分区：
文献类型：
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作者：
J. Hénoux
在这篇评论中，离子中性分馏导致的增强的低FIP到高FIP丰度比在日冕或太阳风的主要模型，提出。基于平行于磁场的扩散模型进行了讨论，它们高度依赖于边界条件。当离子-中性粒子频率低于离子回旋频率时，磁场自然地将离子与垂直于场线方向移动的中性粒子分离，预期在离子-中性粒子分离中发挥积极作用。然后提出，离子中性分馏与太阳色球层的形成有关，即在4000和6000 K之间的温度下的磁通量管中。
In this review, the main models of ion-neutral frationation leading to an enhancement of the low FIP to high FIP abundance ratio in the corona or in the solar wind, are presented. Models based on diffusion parallel to the magnetic field are discussed; they are highly dependent on the boundary conditions. The magnetic field, that naturally separates ions from neutrals moving perpendicular to the field lines direction, when the ion-neutral frequency becomes lower than the ion gyrofrequency, is expected to play an active role in the ion-neutral separation. It is then suggested that ion-neutral fractionation is linked to the formation of the solar chromosphere, i.e. in magnetic flux-tubes at a temperature between 4000 and 6000 K.