Initial duct growth determined from cold-start plasma-line data recorded at Arecibo

Details Initial duct growth determined from cold-start plasma-line data recorded at Arecibo Initial duct growth determined from cold-start plasma-line data recorded at Arecibo

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19...65m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, Jan. 3, 1992, p. 65-68.

Physics

8

Cold Plasmas, F Region, Field Aligned Currents, Landau Damping, Plasma Spectra, Plasma Waves, Electrostatic Waves, Ionospheric Electron Density, Ionospheric Propagation, Plasma Turbulence

Scientific paper

The initial development of the HF-enhanced plasma line in a cold ionosphere is investigated. The plasma line is first observed after 3 ms very close to the HF-reflection height and not at the height expected from weak-turbulence theory in a uniformly varying ionosphere. Natural field-aligned ducts with a diameter of a few meters or more can trap Langmuir waves (L waves) generated by the parametric decay instability and propagating nearly parallel to the magnetic field B. The ponderomotive force of the trapped L waves near the highest HF interference maximum causes electrons to be expelled parallel to B and ions to be expelled perpendicular to B. The ion gyroradius is comparable to the smallest duct diameter than can trap L waves. Since it only takes a few milliseconds for the ions to move at their thermal velocity across the duct, the duct can grow in a few milliseconds to a level where L waves capable of backscattering the Arecibo radar can be trapped. Duct growth is eventually limited by Landau damping and/or escape of the ducted L waves.

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