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Fricke, K. H.

Publications and source records attributed to Fricke, K. H..

3 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1981

Observation of outer planets at Lyman alpha

A triple planetary observation in one IUE shift was conducted to measure the Lyman alpha reflectivity of Jupiter, Saturn and Uranus. The exposures were planned to take account of the light travel times, Sun to planet and planet to Earth, in order to assess the response of the three atmospheres to essentially the same incident solar flux. All additional uncertainties that were introduced when different instruments were used for such a comparative measurement were automatically eliminated.

Darius, J.↗
NASA NTRS1980

The upper atmosphere of Venus during morning conditions

The structure and composition of the Venus upper atmosphere between 130- and 650-km altitude were measured for a solar zenith angle of approximately 60 deg by the neutral gas mass spectrometer on board the Pioneer Venus multiprobe bus. Below 180 km a wavelike structure is quite evident in the CO2 and He number density profiles. For altitudes above 100 km a one-dimensional model of the Venus upper atmosphere during morningside conditions (MS model) is presented. Number densities at 150-km altitude are as follows: CO2 equals 4.2 x 10 to the 9th, N2 equals 1.1 x 10 to the 9th, CO equals 2.8 x 10 to the 9th, and He equals 4.8 x 10 to the 6th per cu cm. The homopause altitudes for N2 and He are at 136 and 130 km, respectively.

Von Zahn, U.↗