Abstract
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 ~ 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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