Cyclotron maser emission: stars, planets, and laboratory
Cyclotron maser emission: stars, planets, and laboratory
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DOI：
10.1063/1.3567420
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发表时间：
2010-11
影响因子：
2.2
通讯作者：
I. Vorgul;B. Kellett;R. A. Cairns;R. Bingham;K. Ronald;D. Speirs;S. McConville;K. Gillespie
中科院分区：
文献类型：
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作者：
I. Vorgul;B. Kellett;R. A. Cairns;R. Bingham;K. Ronald;D. Speirs;S. McConville;K. Gillespie
本文回顾了该小组在过去十年中关于极光千米辐射和来自恒星和行星的类似回旋辐射的结果。这些发射通常归因于高能电子运动到偶极型恒星和行星极地区域周围存在的会聚磁场中的马蹄形或新月形动量分布。我们已经建立了一个实验室为基础的设施，已经验证了我们原来的理论描述的许多细节，并同意与数值模拟。实验已经证明，马蹄形分布确实在仅低于局部回旋频率的频率下产生回旋辐射，其偏振接近于X模式并且几乎垂直于束运动传播。我们讨论的不稳定性的理论和模拟，包括解决辐射逃逸问题和竞争的不稳定性的影响，与这些实验室，空间和天体物理观测的最新发展。
This paper is a review of results by the group over the past decade on auroral kilometric radiation and similar cyclotron emissions from stars and planets. These emissions are often attributed to a horseshoe or crescent shaped momentum distribution of energetic electrons moving into the convergent magnetic field which exists around polar regions of dipole-type stars and planets. We have established a laboratory-based facility that has verified many of the details of our original theoretical description and agrees well with numerical simulations. The experiment has demonstrated that the horseshoe distribution does indeed produce cyclotron emission at a frequency just below the local cyclotron frequency, with polarization close to X-mode and propagating nearly perpendicularly to the beam motion. We discuss recent developments in the theory and simulation of the instability including addressing a radiation escape problem and the effect of competing instabilities, relating these to the laboratory, space, and astrophysical observations.