HF-induced parametric decay in presence of field-aligned irregularities

Details HF-induced parametric decay in presence of field-aligned irregularities HF-induced parametric decay in presence of field-aligned irregularities

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6407r&link_type=abstract

Journal of Geophysical Research, vol. 84, Nov. 1, 1979, p. 6407-6416. Research supported by the Max-Planck-Institut für Aeronom

Physics

2

High Frequencies, Ionospheric Propagation, Landau Damping, Magnetohydrodynamic Stability, Plasma Waves, Plasma-Electromagnetic Interaction, Backscattering, F Region, Ionospheric Heating, Nonuniform Plasmas, Plasma Decay, Propagation Modes, Short Wave Radio Transmission

Scientific paper

A nonlinear theory for the saturation of the HF-induced parametric decay instability is formulated in terms of the normal modes of a field-aligned plasma wave duct. Coupling coefficients between modes are derived, and a saturation spectrum is computed numerically for a typical irregularity. The computed spectrum shows that unstable waves may propagate at larger angles to the magnetic field than would be the case in a regular medium. The relevance of this work to the experiment of Muldrew and Showen (1977), concerning the height of the HF-induced plasma line at Arecibo, is discussed. A possible explanation is also found for the 'decay line' feature in comparison with the 'broad bump' in the observed backscatter spectrum.

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