Thermal modulation of the plasma density in ionospheric heating experiments

Details Thermal modulation of the plasma density in ionospheric heating experiments Thermal modulation of the plasma density in ionospheric heating experiments

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44.1049i&link_type=abstract

(International Union of Radio Science, General Assembly on Ionospheric Modification, 20th, Washington, DC, Aug. 10-19, 1981.) Jo

Physics

30

F Region, Ionospheric Heating, Plasma Density, Space Plasmas, Electrostatic Waves, High Frequencies, Magnetohydrodynamic Stability, Nonlinear Evolution Equations

Scientific paper

A numerical model was developed for simulating the nonlinear evolution of unstable density irregularities in the F region plasma, particularly the field-aligned striations (FAS) which can be produced using ground-based HF transmitters. The analysis is centered around the intense scattering of a long wavelength electromagnetic heater wave at small scale FAS into primary Langmuir waves propagating perpendicularly to the magnetic field. A threshold is quantified for the explosive growth of the instability when the electric field of the heater wave (an electron flow) exceeds a value of 1/1000 V per meter divided by the amplitude of the initial fractional density perturbation. The simulation indicated that localized field-aligned density depletions which appear have a 1 m width and are perpendicular to the magnetic field. The depletions trap the Langmuir waves scattered from the heater wave and become heated.

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