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<p>We study the equilibrium condition for a coronal magnetic loop in the form of a thin magnetic tube with electric current (the generalized Bennett criterion). Cases of current closure through the loop surface and through the photosphere are considered. It is shown that in coronal loops there is a minimum (critical) current at which a stationary loop structure can exist. The dependence of the critical current on the pressure and magnitude of the magnetic field in the loop is obtained. The current value inside the loop can become of the order of or below the critical value as a result of a flare process accompanied by the injection of chromospheric plasma and an increase in gas pressure inside the loop. This can lead to a violation of the loop equilibrium, in particular, to a change in the height and excitation of loop oscillations, which is illustrated by the existing observational data.</p>

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Critical Currents in Coronal Magnetic Loops and Their Possible Manifestation During Flare Processes

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • V. V. Zaitsev,
  • T. V. Simonova

摘要

We study the equilibrium condition for a coronal magnetic loop in the form of a thin magnetic tube with electric current (the generalized Bennett criterion). Cases of current closure through the loop surface and through the photosphere are considered. It is shown that in coronal loops there is a minimum (critical) current at which a stationary loop structure can exist. The dependence of the critical current on the pressure and magnitude of the magnetic field in the loop is obtained. The current value inside the loop can become of the order of or below the critical value as a result of a flare process accompanied by the injection of chromospheric plasma and an increase in gas pressure inside the loop. This can lead to a violation of the loop equilibrium, in particular, to a change in the height and excitation of loop oscillations, which is illustrated by the existing observational data.