On the accuracy of measured values of upper-atmosphere density

Abstract

In an interesting paper Newton et al. [1964] discussed values of atmospheric density obtained using ionization gages aboard the satellite Explorer 17. The gage densities were adjusted to magnetically quiet conditions and normalized to a height of 280 km on the basis of the model atmosphere of Harris and Priester [1962]. The values were then plotted against local time and compared with results from drag studies normalized to the same conditions. The drag values were taken from studies of the orbits of Injun 3 [Jacchia and Slowey, 1964] and Explorer 17 [Bryant, 1964] ; values given by the Harris and Priester model for a solar radiation energy flux S of 90 watts m−2 sec−1 (c/s)-1 on a wavelength of 10.7 cm were also shown.