Observations and simulations of VLF harmonic generation with the high-power auroral simulation array

Details Observations and simulations of VLF harmonic generation with the high-power auroral simulation array Observations and simulations of VLF harmonic generation with the high-power auroral simulation array

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10127027r&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A12, p. 27027-27034

Physics

Plasma Physics

5

Ionosphere: Active Experiments, Ionosphere: Plasma Temperature And Density, Magnetospheric Physics: Auroral Phenomena, Space Plasma Physics: Active Perturbation Experiments

Scientific paper

We report experimental results from the high-power auroral simulation facility showing that the lower D region can be heated so as to produce either a single, narrowband ELF/VLF radiation signal at the modulation frequency or a signal containing the modulation frequency and many odd harmonics. The measurements are compared to a new 2 1/2-dimensional simulation code that models the lower D region and the Earth ionospheric waveguide. The simulation spectra show good agreement with the observations. Rapidly switching the HF power off and on leads to perturbing currents in the D region that vary in time in a square wave type pattern. This generates an ELF/VLF wave with high, odd harmonics observed up to n=13 (f=nf0, where f0 is the modulating frequency). A more smoothly changing power variation generates a narrowband signal at f0. Simulations show how the D region affects the spectral shape. From these results we find that the heating should occur at a low altitude in the D region (approximately 75 km). Using the simulation results, we determine that the D region current needed to produce the magnetic field spectrum with the odd harmonics has a square wave time variation.

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