HF modification of the auroral D-region detected by a partial reflection experiment

Details HF modification of the auroral D-region detected by a partial reflection experiment HF modification of the auroral D-region detected by a partial reflection experiment

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..537h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, June 1985, p. 537-545. DFG-supported research.

Physics

6

D Region, Electron Energy, Ionospheric Electron Density, Ionospheric Heating, Ionospheric Propagation, Auroral Ionization, High Frequencies, Radio Transmitters, Radio Waves, Reaction Kinetics, Wave Propagation

Scientific paper

During an auroral event with strong ionization in the lower D-region, the ionosphere was modified by a powerful (260 MW ERP) transmitter operating at 4 MHz in the extraordinary mode. The effects on the received partial reflection in an experiment using 2.75 HMz waves were observed. The results indicate a very abrupt increase in electron temperature with a factor of about 3 at the level of maximum heating. This seems to be followed by a change in electron density, probably due to electron temperature variation of recombination reaction rates. The effect of the heating wave on the irregularities giving rise to the partial reflections is discussed.

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