Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.155002
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Funding
- EPSRC Grant [EP/G04239X/1]
- EPSRC [EP/G04239X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G04239X/1] Funding Source: researchfish
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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.
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