Cowling resistivity and Joule dissipation in solar atmosphere

A. Stepanov, V. Zaitsev, E. Kupriyanova
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Abstract

Joule dissipation rates in the magnetic flux tubes at di ff erent heights of the solar atmosphere, from the photosphere to the corona, are studied. It is assumed that the generation of electric currents is caused by convective motions at the photospheric foot-points of the flux tubes. It is shown that the role of ion–atom collisions in the Joule dissipation and solar plasma heating is decisive. The Cowling resistivity exceeds the classical (Spitzer) resistivity not only in the weakly ionized layers of the atmosphere but also in the corona with the relative density of the neutral atoms of about 10 − 7 cm − 3 if the electric currents are I ≥ 2 × 10 8 A. As an illustration of the altitude dependence of the Cowling resistivity for di ff erent magnitudes of the electric current, we applied the atmospheric model developed by Avrett and Loeser [1]. We have shown that the maximal dissipation occurs in the transition region. The role of Cowling resistivity in Joule dissipation increases with the filamentation of magnetic flux tubes. The Multifaceted Universe: Theory
太阳大气中的整流电阻率和焦耳耗散
研究了在太阳大气不同高度,从光球层到日冕层,磁通管的焦耳耗散率。假定电流的产生是由磁通管的光球脚点处的对流运动引起的。结果表明,离子-原子碰撞在焦耳耗散和太阳等离子体加热中起决定性作用。当电流为1≥2 × 10 8 A时,在中性原子相对密度约为10−7 cm−3的日冕中,考凌电阻率不仅在大气的弱电离层中,而且也超过了经典的(斯皮策)电阻率。为了说明不同电流强度下的整流电阻率对海拔的依赖性,我们采用了Avrett和Loeser[1]开发的大气模型。我们已经证明,最大耗散发生在过渡区。随着磁通管的细丝化,整流电阻率对焦耳耗散的影响越来越大。多面宇宙:理论
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