Abstract
We investigate the effect of geomagnetic disturbances by comparing model calculated and experimental values of electron density (N) at the fixed height of 200 km for 18 disturbed days of the summer period of 1960 using data from the Fort Monmouth observatory. The model used is represented as an analytical expression admitting a dependence of N on neutral partial densities, thermospheric gas temperature, as well as on the solar zenith angle and solar activity index. The coefficients of the used relation had been derived with help the data of N(h) profiles obtained at Moscow, and applying the well known thermospheric model (Hedin, 1987). Modelled dependencies of N on the planetary geomagnetic activity index A p are given also for summer and winter for the set of latitudes and longitudes. N decreases with increasing A p. This effect is more pronounced in the summer period.
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