Physics – Plasma Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dppno7006b&link_type=abstract
American Physical Society, 49th Annual Meeting of the Division of Plasma Physics, November 12-16, 2007, abstract #NO7.006
Physics
Plasma Physics
Scientific paper
Cyclotron masers are important laboratory devices and play a major role in planetary and stellar radio emission. Recently we have shown that a cyclotron maser instability driven by a horseshoe shaped distribution in velocity space may be responsible for the observations. A long standing problem though is how the radiation generated at frequencies below the upper hybrid resonance, gets onto the higher frequency branch of the dispersion curve that connects to the vacuum propagation branch. Here we consider some of the dispersion properties of waves in the presence of energetic particle populations in the shape of a horseshoe and ring distribution in velocity space. The analysis is carried out in a homogeneous and an inhomogeneous magnetic field and demonstrates that the extraordinary mode that is initially driven unstable by the energetic particles can couple to the vacuum regime and escape the region.
Bingham Robert
Cairns Alan
Cross Adrian
Kellett Barry
McConville Sandra
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