Features of the Joule Dissipation in the Solar Atmosphere

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Geomagnetism and Aeronomy Pub Date : 2025-02-14 DOI:10.1134/S0016793224700300

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

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Abstract

The decisive role of the neutral component of solar plasma in the dissipation of electric currents in magnetic flux tubes is shown. For the first time, the dependences of the Cowling resistivity and the rate of the Joule dissipation were obtained for various current magnitudes in a wide range of heights, from the photosphere to the corona. Based on the atmospheric model of Avrett and Loeser (2008) it was shown that the Cowling resistivity exceeds the classical (Spitzer) resistivity in the chromosphere and the transition region. The Spitzer resistivity prevails over the Cowling one at the altitudes less than 300–1000 km depending on the electric current magnitude. The Cowling resistivity plays the main role at the electric currents of more than 10⁹ A in the corona with a relative density of neutral atoms ∼10^–7. It was found that the maximum of the Joule dissipation is located at the altitude of about 2100 km, which creates favorable conditions for formation of the chromosphere-corona transition region and heating of the corona. Anomalous (turbulent) resistance requires a lot of tiny current filaments in a flux tube. The role of Joule dissipation in the heating of pre-flare plasma and in the formation of the sunspot light bridges is discussed.

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太阳等离子体的中性成分在磁通管中的电流耗散中起着决定性作用。首次获得了在从光球到日冕的宽广高度范围内各种电流大小的考林电阻率和焦耳耗散率的相关性。根据 Avrett 和 Loeser（2008 年）的大气模型，在色球层和过渡区，Cowling 电阻率超过了经典（Spitzer）电阻率。在低于 300-1000 千米的高度上，Spitzer 电阻率高于 Cowling 电阻率，这取决于电流大小。在中性原子相对密度 ∼10-7 的日冕中，当电流超过 109 A 时，Cowling 电阻率起主要作用。研究发现，焦耳耗散的最大值位于约 2100 千米的高度，这为形成色球-日冕过渡区和加热日冕创造了有利条件。反常（湍流）电阻需要通量管中有大量微小的电流丝。讨论了焦耳耗散在耀斑前等离子体加热和形成太阳黑子光桥中的作用。

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来源期刊

Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science

CiteScore

1.30

自引率

33.30%

发文量

审稿时长

4-8 weeks

期刊介绍： Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.