Abstract
A self-consistent method for day-time F-region modeling was applied to EISCAT and Millstone Hill radar observations during severe ionospheric storms. One observed by EISCAT on Apr 03, 1992 shows a strong N mF2 decrease which is attributed to a strong imposed electric field, in another case observed at Millstone Hill on Apr 10, 1990 such a decrease is caused by neutral composition and temperature changes. Calculations indicate that the ionosphere was molecular-ion dominated even at F2-layer heights, requiring a correction to the routinely-evaluated T e(h), T i(h) and N e(h) profiles.
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