电流片的稳定性问题

ON PROBLEMS OF THE STABILITY OF ELECTRIC CURRENT SHEETS

本文从理想磁流体力学出发,分析了固结在光球层上的半圆弧形电流片的线性稳定性.主要结论是:当沿电流方向的磁场小于某临界值时,电流片将不稳定,且最先引起不稳定的扰动模沿电流方向的波数近似为电流片圆弧直径的倒数.

Based on the ideal magnetohydrodynamics, the present paper discusses the linear stability of a semicircular electric current sheet tied at the photoshere. The main conclusion is that the electric current sheet becomes unstable if the magnetic field component in the direction of the electric current is less than a certain critical value. Furthermore, the wave number of the disturbance in the current direction, which causes the instability first, is approximately the reciprocal of the diameter of the current sheet circle.