脉冲磁场中液态铷的阿尔文波实验
Alfvén wave experiments with liquid rubidium in a pulsed magnetic field
摘要：
磁场是将日冕加热到几百万开尔文温度的关键因素。在这方面，一个特别重要的区域是日冕下方所谓的磁冠，在那里声音和阿尔文波具有大致相同的速度，因此可以很容易地相互转换。本文介绍了在高达63 T的脉冲场中用液体铷进行阿尔文波实验的结果。在54 T的临界点处，Alfvén波和声音的速度一致，除了外部激励的8 kHz扭转波之外，还出现了新的4 kHz信号。这种具有双倍周期的阿尔文波的出现与两种波类型之间的参数共振的理论预测一致。我们还提出了初步的结果，阿尔文和磁声波的数值模拟使用可压缩MHD代码。
英文摘要：
Magnetic fields are key ingredients for heating the solar corona to temperatures of several million Kelvin. A particularly important region with respect to this is the so-called magnetic canopy below the corona, where sound and Alfvén waves have roughly the same speed and can, therefore, easily transform into each other. We present the results of an Alfvén-wave experiment with liquid rubidium carried out in a pulsed field of up to 63 T. At the critical point of 54 T, where the speeds of Alfvén waves and sound coincide, a new 4 kHz signal appears in addition to the externally excited 8 kHz torsional wave. This emergence of an Alfvén wave with a doubled period is in agreement with the theoretical predictions of a parametric resonance between the two wave types. We also present preliminary results from numerical simulations of Alfvén and magneto-sonic waves using a compressible MHD code.
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