Wave propagation in intense flux tubes
Wave propagation in intense flux tubes
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DOI：
10.1007/bf00151162
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发表时间：
1983-08
期刊：
影响因子：
2.8
通讯作者：
B. Roberts
中科院分区：
文献类型：
--
作者：
B. Roberts
探讨了细长磁通管中非绝热波传播的性质。理论结果与Giovanelliet等人的观测结果进行了比较。（1978），并认为是在一般协议。这些观测，在光球-色球层的管，显示向外传播的波，周期为300秒，这需要大约19秒，从一个层次的线形成传播到另一个层次更高的大气中。与此形成鲜明对比的是，7秒的时间为一个类似的干扰管外传播相同的两个层次之间的线形成，估计是一些600公里，除了在现场的自由atmosphere.It认为，鲜明对比的传播时间为管和它的环境主要是由于管的弹性和随后的传播倾向。一个非绝热扰动可能基本上是在管内传播，但基本上不向外传播，与相当慢的相速度，从而出现在tube.The理论认为，所观察到的扰动是非绝热，声重力波沿着磁通量管和调制的外部压力变化。
The nature of non-adiabatic wave propagation in a slender magnetic flux tube is explored. The results of the theory are compared with the observations of Giovanelliet al.(1978), and found to be in general agreement. Those observations, of tubes in the photosphere-chromosphere, show outwardly propagating waves, with periods of 300 s, which take some 19 s to propagate from one level of line formation to another level higher in the atmosphere. In sharp contrast to this, is the time of 7 s for a similar disturbance outside the tube to propagate between the same two levels of line formation, estimated to be some 600 km apart in the field-free atmosphere.It is argued that the sharply contrasting propagation times for the tube and its environment is principally due to the elasticity of the tube and its subsequent propensity for propagation. A non-adiabatic disturbance may be essentially propagating within the tube but essentially non-propagating outside, with considerably slower phase speeds thus arising inside the tube.The theory suggests that the observed disturbances are non-adiabatic, acoustic-gravity waves channelled along a magnetic flux tube and modulated by external pressure variations.