Backward wave cyclotron-maser emission in the auroral magnetosphere

D. C. Speirs, R. Bingham, R. A. Cairns, I. Vorgul, B. J. Kellett, A. D R Phelps, K. Ronald

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

LanguageEnglish
Article number155002
Number of pages5
JournalPhysical Review Letters
Volume113
Issue number15
DOIs
Publication statusPublished - 7 Oct 2014

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backward waves
masers
magnetospheres
cyclotrons
radiation
radio emission
refraction
astrophysics
inhomogeneity
cells
electrons
simulation

Keywords

  • backward waves
  • auroral magnetosophere
  • cyclotron maser emission

Cite this

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Backward wave cyclotron-maser emission in the auroral magnetosphere. / Speirs, D. C.; Bingham, R.; Cairns, R. A.; Vorgul, I.; Kellett, B. J.; Phelps, A. D R; Ronald, K.

In: Physical Review Letters, Vol. 113, No. 15, 155002, 07.10.2014.

Research output: Contribution to journalArticle

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AU - Speirs, D. C.

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AU - Kellett, B. J.

AU - Phelps, A. D R

AU - Ronald, K.

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