Transverse Oscillations of Coronal Loops with Slowly Changing Density
Transverse Oscillations of Coronal Loops with Slowly Changing Density
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DOI：
10.1007/s11207-011-9772-z
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发表时间：
2011-05
期刊：
影响因子：
2.8
通讯作者：
M. Ruderman
中科院分区：
文献类型：
--
作者：
M. Ruderman
本文研究了日冕环在密度沿着变化且随时间缓慢变化时的扭折振荡。利用WKB方法，我们得到了决定振荡振幅随时间变化的绝热不变量。所得一般结果适用于冷却回路的扭折振荡。本研究的主要结论是，冷却导致的扭结振荡放大。
In this paper we study kink oscillations of coronal loops with the density varying along the loop and also slowly changing with time. Using the Wentzel–Kramers–Brillouin (WKB) method we obtain the adiabatic invariant that determines the time dependence of the oscillation amplitude. The obtained general results are applied to kink oscillations of cooling loops. The main conclusion of this study is that cooling causes the amplification of kink oscillations.