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). 155002. ISSN 0031-9007

[thumbnail of Speirs-etal-PRL-2014-Backward-wave-cyclotron-maser-emission-in-the-auroral-magnetosphere]
Preview
 Text (Speirs-etal-PRL-2014-Backward-wave-cyclotron-maser-emission-in-the-auroral-magnetosphere)
Speirs_etal_PRL_2014_Backward_wave_cyclotron_maser_emission_in_the_auroral_magnetosphere.pdf
Final Published Version
Download (1MB)| Preview

    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.

    ORCID iDs

    Speirs, D. C. ORCID logoORCID: https://orcid.org/0000-0001-5705-6126, Bingham, R. ORCID logoORCID: https://orcid.org/0000-0002-9843-7635, Cairns, R. A., Vorgul, I., Kellett, B. J., Phelps, A. D. R. ORCID logoORCID: https://orcid.org/0000-0002-1100-1012 and Ronald, K. ORCID logoORCID: https://orcid.org/0000-0002-8585-0746;
    • Item type:Article
      ID code:50172
      Dates:
      Date
      Event
      7 October 2014
      Published
      12 September 2014
      Accepted
      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:25 Jun 2021 02:29
      Related URLs:
      URI:https://strathprints.strath.ac.uk/id/eprint/50172
    CORE (COnnecting REpositories)