Non-Maxwellian model of ionospheric heating by HF radiation

Details Non-Maxwellian model of ionospheric heating by HF radiation Non-Maxwellian model of ionospheric heating by HF radiation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa53b1379l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA53B-1379

Physics

2400 Ionosphere (6929), 2403 Active Experiments, 2447 Modeling And Forecasting, 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934)

Scientific paper

Ionospheric DC conductivity changes due to HF (high-frequency) heating are considered using a kinetic (non- Maxwellian) model. The modification of the electron distribution caused by propagation and absorption of ordinary and extraordinary waves are calculated by taking into account self-absorption due to modification of the background HF conductivity. The processes considered in the kinetic equation for electron distribution include excitations of electronic and vibrational levels of atmospheric molecules, small rotational losses, ionization and attachment. We consider steady-state and square-wave modulated heating regimes. Results indicate that lower modulation frequencies, with the same amplitude of HF field at the source, lead to higher changes of ionospheric conductivity. The resultant ELF/VLF wave generation by modulation of the polar electrojet current is calculated using a finite difference model. The differences between kinetic (non- Maxwellian) and thermal (Maxwellian) modelling approaches are discussed. Comparisons indicate that the assumption of Maxwellian electron distribution leads to underestimation of electron temperature and concductivity changes.

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