The Shape and Location of the Diurnal Bulge in the Upper Atmosphere

Physics

Scientific paper

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Scientific paper

An analysis of the drag of the two balloon satellites in near-polar orbits launched in the course of the last 2 years (Explorers 19 and 24) has afforded the opportunity of our studying the distribution of density and temperature at high latitudes, and has led to strange results concerning the shape and behavior of the diurnal atmospheric bulge. The picture of a bulge in which temperature and density decrease nearly symmetrically in all directions from a location that follows the latitude migrations of the subsolar point would seem to need considerable revision, at least for heights above 500 km. It appears that the bulge is noticeably elongated in the north-south direction and that its center does not move much from the equator - a picture that is reminiscent of that of the ion density distributions in the F2 layer. Some possible implications are discussed, as well as sources of error that may have affected these results.

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