Results 171 to 180 of about 3,068 (209)

A radio altimeter antenna for a planetary probe

IEEE Transactions on Antennas and Propagation, 1976
The design of a 400 MHz directional antenna for a space vehicle is presented. The design utilizes the spacecraft itself as an integral part of the antenna. The antenna has a gain of 4 dB over a dipole, a front to back ratio of 8 dB, and a - 6 dB beam angle of 34\deg . Design equations and experimental data are presented.
J. Beyer, J. Afanasjevs, N. Levanon
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Magnetic probing of planetary interiors

Physics of the Earth and Planetary Interiors, 1979
Abstract The following general question is addressed: what can be learned about a planetary interior from measurements of the global planetary magnetic field at (or near) its surface? The discussion is placed in the context of Earth, for clarity, but the considerations apply to terrestrial planets in general (so long as the observed magnetism is ...
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Planetary Probe: Origin of Atmosphere of Venus

Science, 1969
The high temperatures and chemical composition, as determined by space probe and terrestrial observation, suggest that the present atmosphere of Venus has formed by chemical interaction with the lithosphere. Although the precise reactions have not been identified, good theoretical approximations to the molecular abundance may be obtained from reactions
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PROBING PLANETARY ATMOSPHERES WITH STELLAR OCCULTATIONS

Annual Review of Earth and Planetary Sciences, 1996
▪ Abstract  Earth-based stellar occultations probe the temperature, pressure, and number-density profiles of planetary atmospheres in the microbar range with a vertical resolution of a few kilometers. Depending on the occultation data available for a given body and other information, the technique also allows determination of local density variations,
J. L. Elliot, C. B. Olkin
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Probing planetary pollution from space

Environmental Science & Technology, 1991
The data sets obtained from instruments that have measured carbon monoxide and tropospheric ozone from space are reviewed. These instruments include a gas cell correlation radiometer named MAPS (Measurement of Air Pollution from Satellites), the Total Ozone Mapping Spectrometer, and the Stratospheric Aerosol and Gas Experiment.
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Technology Challenges for Planetary Probes to Dense Atmospheres

2008 IEEE Aerospace Conference, 2008
Both the 2003 Solar System Exploration Decadal Survey, by the National Research Council, and NASA's 2006 Solar System Exploration Roadmap identified Saturn, Jupiter, and Venus, as high priority scientific targets and recommended missions to explore them.
Tibor S. Balint, James A. Cutts, Elizabeth A. Kolawa   +2 more
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Raman scattering as a probe of planetary atmospheres

Advances in Space Research, 1981
The observable effects of Raman scattering on the spectra of the giant planets may provide new information on the composition and structure of these atmospheres. Satellite observations have already shown the influence of Raman scattering on the UV continuum albedo.
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Thermal design and development of a planetary probe - Pioneer Venus large probe

2nd Thermophysics and Heat Transfer Conference, 1978
The thermal control system developed for the Large Atmospheric Probe of the Pioneer Venus Multiprobe Mission is described. The scope of the thermal control task requires maintaining the probe internal equipment shelf temperatures within a nonoperating range of -40 to 122 F and an operating range of -4 to 122 F during three different mission phases: (1)
L. HENNIS, M. VARON
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Radio Occultation Experiment for Probing Planetary Ionospheres

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 2019
Radio occultation (RO) is an important measurement technique for studying planetary atmospheres. It is based on the measurement of the frequency shift of the received radio signal from the spacecraft, caused by the bending of radio waves in the atmosphere.
Varun Sheel, Jayesh Pabari
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Dynamics of planetary probes - Design and testing issues

36th AIAA Aerospace Sciences Meeting and Exhibit, 1998
Interest in planetary probes has increased significantly in the last few years. Many of the proposed missions will use aeroassist for the capture and descent phases of the missions. This use of aeroassist will put a greater demand on having accurate aerodynamics for these vehicles.
Gary Chapman, Leslie Yates
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