Elemental diffusion and segregation processes in partially ionized solar plasma
Elemental diffusion and segregation processes in partially ionized solar plasma
复制标题
部分电离太阳等离子体中的元素扩散和分离过程
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
V. Baturin
中科院分区：
文献类型：
--
作者：
A. Gorshkov;V. Baturin
虽然扩散通常与化学成分的均衡有关，但太阳内部的压力和温度梯度会导致元素扩散偏析。当轻氢向上流动到太阳包层时，氦和较重的元素正在下沉到核心。我们模拟的目标是准确地估计太阳演化过程中太阳等离子体中的沉降速率。包层中氦的贫化率是太阳演化的一个关键参数，它取决于对流混合区底部周围的位置和条件。重元素的沉降速率对电离程度和与辐射通量的相互作用很敏感。在LTE假设和根据Saha-S状态方程进行热力学计算的框架下，我们估计了离子电离对几种重元素到铁的沉降速率的影响。
Although diffusion is usually associated with equalizing of the chemical composition, the pressure and temperature gradients inside the Sun cause elemental diffusion segregation. While light hydrogen is flowing up to the solar envelope, helium and heavier elements are settling down to the core. The target of our simulation is an accurate estimation of the settling rate in solar plasma during the course of solar evolution. The rate of helium depletion in the envelope is a key parameter of the solar evolution and depends on position and conditions around the base of the convective mixing zone. The rate of heavy element settling is sensitive to the degree of ionization and interaction with the radiation flux. We estimate the effect of ion ionization on the settling rate for several heavy elements up to iron in the framework of the LTE assumption and the thermodynamic calculation according to SAHA-S EOS.