Zobrazeno 1 - 10
of 56
pro vyhledávání: '"G. Fjeldbo"'
Autor:
W. H. Michael, Edward J. Christensen, B. L. Seidel, Andrew Wallio, Mario D. Grossi, David L. Farless, Jitendra Mehta, G. Fjeldbo, Donald Sweetnam, J. P. Brenkle
Publikováno v:
Journal of Geophysical Research. 82:4317-4324
Radio occultation measurements were made at approximately 50 locations on Mars with the Viking Orbiter 1 S (2.3 GHz) and X (8.4 GHz) band tracking links during October 1976. The measurements have been used to study the topography and atmosphere of Ma
Autor:
G. Fjeldbo, Donald Sweetnam, Taylor Howard, B. L. Seidel, Pasquale Esposito, Arvydas J. Kliore
Publikováno v:
Icarus. 29:439-444
Analysis of Mariner 10 dual-frequency radio-occultation recordings has yielded new information on the radius and atmosphere of Mercury. The ingress measurements, which were conducted near 1.1 deg north latitude and 67.4 deg east longitude on the nigh
Autor:
S. I. Rasool, D. N. Sweetnam, T. T. Sesplaukis, Arvydas J. Kliore, Peter M. Woiceshyn, B. L. Seidel, G. Fjeldbo
Publikováno v:
Icarus. 24:407-410
The occultation of the Pioneer 10 spacecraft by Io (JI) provided an opportunity to obtain two S-band radio occultation measurements of its atmosphere. The day-side entry measurements revealed an ionosphere having a peak density of about 60,000 el/cu
Publikováno v:
Journal of the Atmospheric Sciences. 32:1232-1236
Data from the Mariner 10 radio occultation experiment have been utilized to determine the vertical electron density distribution in the ionosphere of Venus. The ingress measurements, which were made at latitude 1.3 deg N on the nightside of the plane
Autor:
G. Fjeldbo
Publikováno v:
Planetary and Space Science. 21:1533-1547
Spacecraft radio occultation measurements planned for outer planet missions may yield profiles in height of atmospheric refractivity and microwave loss above the super-refractive regions of the giant planets. In a planetary ionosphere, the refractivi
Autor:
V. R. Eshleman, G. Fjeldbo
Publikováno v:
Journal of Geophysical Research. 70:3217-3225
Theoretical studies have been made of the characteristics of radio waves diffracted at the limb and refracted in the atmosphere of a planet. Sample computations have been made of atmospheric perturbations to the communication links to and from a Mars
Publikováno v:
Journal of Geophysical Research. 70:3701-3710
A method for the study of planetary ionospheres is presented which is based on the use of radio waves propagated between the earth and a spacecraft on an occulting trajectory beyond the planet. Phase path, group path, or amplitude measurements made d
Publikováno v:
Icarus. 16:502-508
The detection of echoes produced by oblique reflection of the RF (2300 MHz) spacecraft carrier from the Martian surface as Mariner 6 and 7 flew behind Mars in 1969, is described. Changes in echo center frequency and bandwidth are utilized to study th
Publikováno v:
Science. 166:1393-1397
Radio occultation measurements with Mariners 6 and 7 provided refractivity data in the atmosphiere of Mars at four points above its surface. For an atmosphere consisting predominantly of carbon dioxide, surface pressures between 6 and 7 millibars are
Publikováno v:
Icarus. 17:484-516
Mariner-9 S-band radio occultation measurements conducted during November and December 1971 are described in terms of new information that was obtained about the shape and atmosphere of Mars. The arrival of the spacecraft coincided with a severely ob