Near-circular orbits within a rotating oblate atmosphere with a diurnal variation in density and variable density scale height

Abstract

The motion of an Earth satellite is considered within an oblate atmosphere with a diurnally varying density profile and a variable density scale height. Expressions are derived which represent the changes of parameters specifying the eccentricity and argument of perigee during one complete orbital revolution. The influence of air drag on near-circular orbits is examined and an insight is gained into the reinforcing or counterbalancing effects of atmospheric oblateness and variable density scale height.