太阳大气中自发重联的数值模拟(Ⅰ)

NUMERICAL SIMULATION FOR MAGNETIC SPONTANEOUS RECONNECTION IN SOLAR ATMOSPHERE(Ⅰ)

本文在考虑了热传导、焦耳耗散和反常电阻的情况下，研究了日冕电流片中的自发重联过程．结果表明自发磁重税可通过反常电阻的焦耳耗散加热大气，这种作用与β值的大小密切相关．这也许可以解释活动区日冕环的稳态加热和耀斑前的预热相；当考虑电流片位形的下边界为固定边界时，由于系连效应会自然形成盔状结构，并且物质以40km／s的速度沿两“腿”下落，这种下落物质速度将造成谱线红移．

Under the considerahon of heat conduhvity, Joule's dissipation and abnormalresistance, thes paper studies numerically the spontanous reconnction can heat theatmosphere by Joule's dissipation of abnormal resisthee, and thes effect is dependentclosely on the value of β When β is 0.05, 0.1 and 0. 5, the heated atmospheretemperature can rise to 2.0×106K, 1. 0×106K and 4.0×105K respectively, this mayaccount for the achve regions stahc heating and the preheating process of flares.Whn the bottom border is fixed, it will form naatly the helmetJike structure dueto the line-tied effect and the matter will fill down along two 'legs' with thevelocity of more than 40km / s. this will lead tO redshift of the spectrum.