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Record Details

Record 29 of 19518
Global empirical model of the Venus thermosphere
Author and Affiliation:
Hedin, A. E.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Niemann, H. B.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Kasprzak, W. T.(NASA Goddard Space Flight Center, Laboratory for Planetary Atmospheres, Greenbelt, MD, United States)
Seiff, A.(NASA Ames Research Center, Moffett Field, CA, United States)
Abstract: Direct measurements of neutral CO2, O, CO, N2, He, and N densities from the Pioneer Venus Orbiter Neutral Mass Spectrometer are described in terms of a spherical harmonic representation (latitude and local time coordinates) of exospheric temperature and number densities at 150 km, using modified Bates temperature profiles. The exospheric temperatures are determined from the altitude variations of atomic oxygen. A global average temperature of 228 K is derived with a first harmonic variation of 5%. The altitude profiles are extended downward to 100 km by using empirical formulas to provide a transition through the turbopause region (simulating the effect of eddy diffusion and vertical flows) and matching entry probe density data. The model reflects the observed variations of temperature and density with the 10.7 cm radio flux index. For a given change in flux at the planet, the exospheric temperature on Venus changes by only 10% of the change seen in the terrestrial thermosphere.
Publication Date: Jan 01, 1983
Document ID:
19830037065
(Acquired Nov 30, 1995)
Accession Number: 83A18283
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Journal of Geophysical Research; p. Jan. 1; 88
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
NASA Ames Research Center; Moffett Field, CA, United States
Description: 11p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ATMOSPHERIC COMPOSITION; ATMOSPHERIC MODELS; THERMOSPHERE; VENUS ATMOSPHERE; CHEMICAL COMPOSITION; EXOSPHERE; PIONEER VENUS 1 SPACECRAFT; SPHERICAL HARMONICS; TEMPERATURE GRADIENTS; TEMPERATURE MEASUREMENT; TURBOPAUSE
Imprint And Other Notes: Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 73-83.
Miscellaneous Notes: 1983, p. 73-83
Availability Source: Other Sources
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