摘要
本文根据波与介质相互作用的一套全MHD方程组,计算了无碰撞阿尔文波波能密度W和波能耗散项E_m,在太阳过渡区和内冕大气中随高度的分布。 计算结果表明:对于温度、密度偏低的大气,在过渡区底部几十甚至几百公里范围内,无碰撞阿尔文波的耗散引起的对大气的加热可超过热传导的贡献。从而说明这种阿尔文波的加热似乎是引起温度、密度偏低的大气(例如冕洞大气)在过渡区中温度陡升的重要原因。
In this paper the distributions of the collisionless Alfven wave energy density W and wave energy dissipation term Em of the transition region are calculated based on the full MHD equations taking account of the interaction between Alfven waves and the medium.From the numerical results, it is found that the collisionless Alfven wave heating could exceed the conduction heating in a zone of a few tens up to even hundreds of kilometers above the base of the transition region in locality of low density and temperature such as a coronal hole. It is suggested that Alfven wave heating may be a dominant energy source causing the steep increase of temperature in the atmosphere of a coronal hole.
