Rapid dissipation of magnetic fields due to the hall current
Rapid dissipation of magnetic fields due to the hall current
复制标题
霍尔电流导致磁场快速耗散
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
A. Olinto
中科院分区：
文献类型：
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作者：
Samuel I. Vainshtein;S. Chitre;A. Olinto
我们提出了一种机制，快速耗散的磁场是有效的分层介质中的离子运动可以忽略不计。在这样的介质中，场被冻结在电子中，霍尔电流占主导地位。虽然霍尔电流保存磁能，但在存在密度梯度的情况下，它们能够产生电流片，电流片可以是磁场有效耗散的场所。我们恢复的频率ω（MH）的霍尔振荡密度梯度的存在下修改。我们表明，这些振荡可以导致交换能量的字段的不同组件之间。我们计算的时间演化，并表明，磁场可以耗散的时间尺度为1/Ω（MH）。这种机制可以在具有非常陡峭的密度梯度的系统中的磁耗散中发挥重要作用，其中离子是静态的，例如在中子星的固体地壳中发现的那些。
We propose a mechanism for the fast dissipation of magnetic fields which is effective in a stratified medium where ion motions can be neglected. In such a medium, the field is frozen into the electrons, and Hall currents prevail. Although Hall currents conserve magnetic energy, in the presence of density gradients they are able to create current sheets which can be sites for efficient dissipation of magnetic fields. We recover the frequency omega(MH) for Hall oscillations modified by the presence of density gradients. We show that these oscillations can lead to an exchange of energy between different components of the field. We calculate the time evolution, and show that magnetic fields can dissipate on a time scale of order 1/omega(MH). This mechanism can play an important role in magnetic dissipation in systems with very steep density gradients, where the ions are static such as those found in the solid crust of neutron stars.