Preliminary Analysis of the Atmospheric Drag of the Twelve-Foot Balloon Satellite (1961 δ1)

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Accurate values of the atmospheric drag for the Explorer 9 satellite (1961 δ1) were computed at 1-day intervals, except during magnetically perturbed days when the interval was 0.5 day. Atmospheric densities at perigee were derived by numerical integration of the drag equation, using a rotating model atmosphere with oblatenness and diurnal bulge. Atmospheric temperatures were derived from Nicolet's helium-topped, diffusion-equilibrium model with asymptotically isothermal temperature profiles. Apart from the diurnal-bulge effect, the temperature T is well represented by T = const + Ap + 2..°5 F 10, where Ap is the daily planetary geomagnetic index and F10 the 10.7-cm solar flux. The temperatures derived from this satellite are in good agreement with the temperatures obtained from several other satellites during the same time interval.

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