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arXiv 2103.07231astro-ph.SR
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短灯丝爆发的临界衰变指数

Critical decay index for eruptions of 'short' filaments

Boris Filippov

摘要:

分析了锚定在光球上的部分载流圆环模型。考虑了系统发生突变失平衡的条件,得到了相应的外磁场临界衰减指数,并考虑了线结条件,得到了临界衰减指数与磁绳顶点高度和长度(端点间距)的非单调关系。对于相对较短的通量绳,临界衰减指数显著低于单位,这与具有高于单位的典型临界衰减指数的广泛模型形成对比。临界折射率在低高度处随高度的急剧下降是由于磁通绳轴的曲率急剧增加,从近直线转变为新月形。

英文摘要:

Model of a partial current-carrying torus loop anchored to the photosphere is analyzed. Conditions of the catastrophic loss of equilibrium are considered and corresponding value of the critical decay index of external magnetic field is found. Taking into account line-tying conditions leads to non-monotonous dependence of the critical decay index on the height of the apex and length of the flux rope (its endpoints separation). For relatively short flux ropes, the critical decay index is significantly lower than unity, which is in contrast to widespread models with the typical critical decay index above unity. The steep decrease of the critical index with height at low heights is due to the sharp increase of the curvature of the flux-rope axis that transforms from a nearly straight line to a crescent.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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