On the Origin of Sunspot Light Bridges

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI:10.1134/S001679322470021X

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

引用次数: 0

Abstract

We propose a model of a light bridge as a current-carrying magnetic flux tube formed by convection. It is shown that convection in the sunspot penumbra provides the electric current necessary to heat the flux rope plasma and forms structures of a light bridge type. The steady-state heating mode of the light bridge is considered, since the light bridge life time (days) is much longer than the typical heating time (minutes). Radiation losses determine the current value I > 10¹¹A required to heat the light bridge to a temperature up to 6800 K. The parameters of the light bridge plasma are presented, and the observed double structure of the light bridge emission is explained.

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关于太阳黑子光桥的起源

我们提出了一个由对流形成的载流磁通管的光桥模型。结果表明，太阳黑子半影区的对流提供了加热磁链等离子体所需的电流，并形成了轻桥型结构。考虑了光桥的稳态加热模式，因为光桥的寿命（天）比典型的加热时间（分钟）要长得多。辐射损耗决定电流值I >；1011A，可将光桥加热至6800 K。给出了光桥等离子体的参数，并对观测到的光桥发射双结构进行了解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.