Other
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2169t&link_type=abstract
Journal of Geophysical Research, vol. 83, May 1, 1978, p. 2169-2176. Bundesministerium für Forschung und Technologie
Other
2
Gas Density, Ion Sources, Ionospheric Composition, Mass Spectrometers, Neutral Gases, Rocket-Borne Instruments, Air Sampling, Atmospheric Models, Cryogenics, Density Distribution, Oxygen Atoms, Vertical Distribution, Wallops Island
Scientific paper
On June 29, 1974 at 1514 LST a neutral gas mass spectrometer with a cryogenically cooled ion source was flown above Wallops Island as part of the Aladdin 74 program. This paper presents the obtained density height profiles of N2, O2, O, and Ar. The maximum of the atomic oxygen density was 10 to the 11th per cu cm at 97.5-km altitude. The altitude where the n(Ar)/n(N2) ratio reaches the sea level value was found to be about 98 km. Above 104-km altitude the densities of all constituents showed a more rapid decrease than that predicted by the Jacchia 71 model. At 112.5 km the ratio of the total mass density and the model value reached a minimum of 0.33. This and other measurements suggest a high degree of variability in the lowest part of the thermosphere.
Offermann Dirk
Steinhauer C.
Trinks Hauke
von Zahn Ulf
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