PVO VENUS ONMS CALIBRATED NEUTRAL DENSITY HIGH RES. V1.0

The instrument was designed to determine the compositionof the neutral thermosphere/exosphere of Venus. The termcomposition includes both the type of neutral gases presentand their quantitative amount. The measurements begin at theorbit's periapsis altitude and extend to a limiting altitudeat which the ambient signal becomes comparable to the gasbackground and/or detector measurement threshold. The neutralcomposition includes helium, atomic nitrogen, atomic oxygen,molecular nitrogen, carbon monoxide and carbon dioxide. Thedata reduction has been described in Niemann et al. (1980a) andKasprzak et al. (1980).