Excitation of electron cyclotron harmonic waves in ionospheric modification experiments

Details Excitation of electron cyclotron harmonic waves in ionospheric modification experiments Excitation of electron cyclotron harmonic waves in ionospheric modification experiments

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.6323r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A5, May 1, 1992, p. 6323-6341.

Physics

11

Atmospheric Physics, Cyclotron Radiation, Earth Ionosphere, Harmonic Radiation, Wave Excitation, Bandwidth, Coupled Modes, E Region, Electromagnetic Radiation, Electrostatic Waves, F Region

Scientific paper

The paper investigates resonance excitation of electrostatic as well as electromagnetic electron cyclotron harmonic waves by mode conversion during ionospheric F region modification experiments when the pump wave frequency is near harmonics of the electron cyclotron frequency. In the electrostatic case the bandwidth around each harmonic frequency within which excitation of electrostatic electron Bernstein waves is possible is calculated. For typical ionospheric parameters the bandwidth is found to be of the order of a few kilohertz, which is in good agreement with the frequency dependence of the excitation and the quenching of the downward maximum in recent modification experiments. Excitation of the upper hybrid wave in the ionospheric E region by means of the fast X mode pump wave seems to be possible for certain parameter ranges. When the pump frequency is near the second harmonic, mode conversion is found to be enhanced. The relevance of these results to the various spectral features like the DM, the broad upshifted maximum, and the broad symmetrical structures found in the simulated electromagnetic emission from the ionosphere is discussed.

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