Physics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.9663w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Oct. 1, 1985, p. 9663-9674.
Physics
54
Auroras, Cyclotron Frequency, Electron Cyclotron Heating, Maser Outputs, Space Plasmas, Bessel Functions, Electron Energy, Harmonic Radiation, Kinematics, Lorentz Transformations
Scientific paper
The plasma conditions and features of the energetic electron distribution in electron cyclotron maser emission for which growth in a particular mode is favored when the ratio of the plasma frequency omega(p) to the electron cyclotron frequency Omega(e) is greater than about 0.3 are determined. It is shown that growth at the fundamental is suppressed as omega(p)/Omega(e) increases and emission at harmonics of Omega(e) dominates. Growth at harmonics of Omega(e) is not restricted to the O and X modes, but can also occur for the Z mode. Whether or not growth in a particular mode dominates depends both on omega(p)/Omega(e) and on the form of the distribution. If the density of the energetic electrons is sufficiently large, the dispersion relations of the O and X modes are modified so that the group velocities of the growing O and X mode waves can be comparable to that of the growing Z mode waves.
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