Abstract
Neutral air velocities at F2-layer heights, electric fields and hmF2 were measured for eight nights by the Arecibo radar. The wind velocities and electric fields were used in a computer program which solved the continuity equation for the F-region. The calculated hmF2 and ƒoF2 variations were then compared to backscatter measurements and ionograms. It was shown that for most of the time, the effect of the winds predominates over that of electric fields. In particular, the evening rise and the subsequent ‘midnight collapse’ of the F-region are almost entirely caused by neutral air winds. There are, however, certain occasions especially around 0400 LT where electric fields are also important.
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