Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5327w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5327-5336. Research supported by the U.S. Navy, NSF,
Physics
19
Auroral Zones, High Energy Electrons, Kilometric Waves, Plasma Frequencies, Cyclotron Radiation, Electron Plasma, Harmonic Radiation, Wave Propagation
Scientific paper
The relativistic dispersion equation based on the cyclotron maser theory for a DGH energetic electron distribution is examined in order to identify and understand the physical conditions under which fundamental O mode and second harmonic X mode radiations can dominate over fundamental X mode emission in low density auroral kilometric radiation source regions. It is found that the energy of the auroral electrons can play a significant role in determining the dominant wave mode. The temporal and spatial growth rates of both the fundamental O mode as well as the second harmonic X mode remain high for energies as low as several hundred eV of the suprathermal electrons, while the fundamental X mode is suppressed for energies no higher than approximately 1 keV due to its relativistic resonance condition.
Krauss-Varban Dietmar
Wong Hung K.
Wu Shang-Chen
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