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Comparison of model electron densities and temperatures with Millstone Hill observations during undisturbed periods and the geomagnetic storms of 16?23 March and 6?12 April 1990

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Figure 1 is a plot of the measured hmF2 and NmF2 for the period 16–23 March 1990 and the model results with and without effects of vibrationally excited N 2 included in the calculated O ‡ ( 4 S) recombination rate
Fig. 2. (Top) Differences between the measured hmF2(exp) and the modeled hmF2(th), and ratios of the measured NmF2(exp) to the modeled NmF2(th) (bottom) for the magnetically quiet and disturbed periods of 16–23 March 1990 for the EUVAC solar flux model
Fig. 3. Ratios of the measured F2 peak densities NmF2(exp) to the modeled F2 peak densities NmF2(th) during the 16–23 March 1990 period for the EUVAC solar flux model
Fig. 4. The time variations of the vibrational and neutral temperatures and populations of the first five vibrational levels of N 2 in comparison with the Boltzmann distribution during the 16–23 March period at the F2 peak altitude
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