Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966saosr.217.....f&link_type=abstract
SAO Special Report #217 (1966)
Astronomy and Astrophysics
Astrophysics
Scientific paper
Recently published data (Horowitz, Newton, and Priester, 1965) indicate that there is a consistent difference, by approximately a factor of 2, between upper-atmosphere densities measured by gauges in an orbiting satellite and densities measured by satellite drag. Prepared for personnel at the Smithsonian Astrophysical Observatory, who have been working with drag measurements, the present report is a discussion of the gauge-measuring technique. The Explorer 17 gauges and interpretation of their data will be specifically considered. The information and data used in this paper are necessarily limited to reports that have been made publically available, to date, by the Aeronomy Group at NASA's Goddard Space Flight Center. It is shown that the present "state of the art" for vacuum gauges is such that it is difficult to make estimates of the accuracy of measurements made in the upper atmosphere. This is mainly because gauge calibrations for atomic oxygen have never been made. Also, interpretation of gauge readings of pressures caused by gas mixtures is quite difficult. In light of the difficulties associated with gauge measurements, it is felt that the factor of 2 between gauge-and drag-determined densities should be described as a difference rather than as a disagreement.
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