W
W. H. Michael
Researcher at Langley Research Center
Publications - 5
Citations - 251
W. H. Michael is an academic researcher from Langley Research Center. The author has contributed to research in topics: Mars Exploration Program & Radio occultation. The author has an hindex of 3, co-authored 5 publications receiving 241 citations.
Papers
More filters
Journal ArticleDOI
Viking radio occultation measurements of the atmosphere and topography of Mars: Data acquired during 1 Martian year of tracking
G. F. Lindal,Henry B. Hotz,D. N. Sweetnam,Zvi Shippony,J. P. Brenkle,Gene V. Hartsell,Richard T. Spear,W. H. Michael +7 more
TL;DR: The results of one Martian year of radio occultation measurements of the atmosphere and topography of Mars obtained using the Viking Orbiters are briefly summarized in this article, where the vertical distribution of tropospheric gas refractivity and ionospheric electron density obtained from atmospheric Doppler frequency perturbations of the S and X band radio tracking frequencies indicate large meteorological variations, with near-surface temperatures ranging from 150 to 250 K, 5-km atmospheric pressure ranging from 3.5 to 4.8 mbar.
Journal ArticleDOI
Viking Radio Occultation Measurements of the Martian Atmosphere and Topography: Primary Mission Coverage
G. Fjeldbo,Donald Sweetnam,J. P. Brenkle,Edward J. Christensen,David L. Farless,Jitendra Mehta,B. L. Seidel,W. H. Michael,Andrew Wallio,Mario D. Grossi +9 more
TL;DR: In this article, the authors used the ingress and egress times obtained from the observed limb diffraction effects together with the best ephemerides available for the orbiter and the planet to determine the surface elevations at the occultation points relative to the reference areoid.
Journal ArticleDOI
The Viking Radio Science Investigations
W. H. Michael,R. H. Tolson,J. P. Brenkle,D. L. Cain,G. Fjeldbo,C. T. Stelzried,Mario D. Grossi,Irwin I. Shapiro,G. L. Tyler +8 more
TL;DR: The Viking radio science investigations utilize data from the radio tracking and communications systems of the orbiters and landers as discussed by the authors, and the primary areas of research are: (1) dynamical, surface, and internal properties of Mars, (2) atmospheric and ionospheric properties of the Mars, and (3) solar system properties.