Scattering of VLF waves on HF-heated D-region disturbances

Details Scattering of VLF waves on HF-heated D-region disturbances Scattering of VLF waves on HF-heated D-region disturbances

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa13a1469l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA13A-1469

Physics

[0644] Electromagnetics / Numerical Methods, [2403] Ionosphere / Active Experiments

Scientific paper

Intense HF radiation from a ground-based facility heats the D-region of the ionosphere. The heating modifies the electron energy distribution function, which is found by solving the kinetic equation at each spatial location. The solution self-consistently takes into account attenuation of HF radiation due to modified HF conductivity. The modification of electron energy distribution leads to the change in the electron-neutral collision frequency and therefore to the change in the conductivity of the disturbed region. Subsequently, we apply the recently developed Stanford FWM (full-wave method) model to the calculation of scattering of VLF transmitter radiation by ionospheric disturbances caused by HF heating, with the utilization of the Born approximation technique. We find the values of the scattered wave magnetic field on the ground to be higher during daytime, due to higher electron density in the D-region. We analyze the validity of Born approximation, and conditions when the second Born approximation calculation is required. We investigate the scattering on ELF/VLF frequency-modulated HF-heated regions and present results of the search for its effects in the experimental data.

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