Narrow-band structure and amplitude of terrestrial myriametric radiation

Details Narrow-band structure and amplitude of terrestrial myriametric radiation Narrow-band structure and amplitude of terrestrial myriametric radiation

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3925h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3925-3932.

Physics

11

Electrostatic Waves, High Temperature Plasmas, Narrowband, Ray Tracing, Terrestrial Radiation, Cyclotron Radiation, Planetary Radiation, Radio Emission, Spectral Energy Distribution

Scientific paper

The narrow-band structure of terrestrial myriametric radiation (TMR) is investigated by ray tracing electrostatic waves in a hot plasma which contains a loss cone distribution. Path-integrated growth of electrostatic waves which refract to the radio window, where mode conversion into TRM is assumed to take place, show that wave amplitudes at the window are approximately 20-30 microV/m. It is shown that the narrow-band frequency bandwidth is less than the source electron gyrofrequency f(ce), but the separation between spectral peaks across several bands is equal to or slightly greater than f(ce). Increasing the density gradient reduces the wave amplitudes by reducing the resonant parallel wavenumber so that waves no longer resonate with the most unstable part of the loss cone distribution. Therefore, there is an upper limit to the density gradient for efficient generation of TMR.

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