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Backward wave cyclotron-maser emission in the auroral magnetosphere

Speirs, D. C. and Bingham, R. and Cairns, R. A. and Vorgul, I. and Kellett, B. J. and Phelps, A. D R and Ronald, K. (2014) Backward wave cyclotron-maser emission in the auroral magnetosphere. Physical Review Letters, 113 (15). ISSN 0031-9007

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Abstract

In this Letter, we present theory and particle-in-cell simulations describing cyclotron radio emission from Earth's auroral region and similar phenomena in other astrophysical environments. In particular, we find that the radiation, generated by a down-going electron horseshoe distribution is due to a backward-wave cyclotron-maser emission process. The backward wave nature of the radiation contributes to upward refraction of the radiation that is also enhanced by a density inhomogeneity. We also show that the radiation is preferentially amplified along the auroral oval rather than transversely. The results are in agreement with recent Cluster observations.

Item type: Article
ID code: 50172
Keywords: backward waves, auroral magnetosophere, cyclotron maser emission, Physics, Physics and Astronomy(all)
Subjects: Science > Physics
Department: Faculty of Science > Physics
Depositing user: Pure Administrator
Date deposited: 07 Nov 2014 09:39
Last modified: 22 Mar 2019 16:39
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URI: https://strathprints.strath.ac.uk/id/eprint/50172
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