Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991rasc...26...31a&link_type=abstract
Radio Science (ISSN 0048-6604), vol. 26, Jan.-Feb. 1991, p. 31-43.
Physics
Galileo Probe, Jupiter Atmosphere, Radio Telemetry, Wave Propagation, Ammonia, Carrier Frequencies, Doppler Effect, Helium, Hydrogen, Iterative Solution, Methane, Planetary Atmospheres, Radio Relay Systems
Scientific paper
As the Galileo probe relay radio link (RRL) signal propagates outward through the Jovian atmosphere, the atmosphere will manifest itself in two ways. First, the geometric path length of the signal is increased, resulting in a small change of the RRL signal departure angle from the probe (transmitter). Secondly, the velocity of the signal is decreased. For a spherical, static atmosphere with a known profile of refractivity versus altitude the effects of refraction on the RRL frequency can be found using a variation of standard ray-tracing techniques, whereby the ray departure angle is found by an iterative process. From the dispersive characteristics of a mixture of hydrogen and helium with trace amounts of methane and ammonia a simple model of the Jovian atmosphere is constructed assuming spherical symmetry and uniform mixing. The contribution to the RRL Doppler frequency arising from refraction is calculated, and its effect on the Doppler wind measurements is discussed.
Atkinson David H.
Spilker Thomas Richard
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