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PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
Contact: Jim Doyle
FOR RELEASE NOVEMBER 7, 1991
A radio experiment using the Magellan spacecraft's powerful
transmitter probed deeper into the atmosphere of Venus than
Magellan Project science team members expected, a spokesman at
NASA's Jet Propulsion Laboratory said.
Project Scientist Dr. Steve Saunders said the experiment was
suggested by Professor Paul Steffes of Georgia Institute of
Technology, and used a technique known as radio occultation.
Magellan is mapping the surface of Venus with imaging radar.
Steffes proposed the experiment using a technique that has been
used in previous planetary missions, including the Voyager
encounters of the outer planets and the currently functioning
Pioneer Venus Orbiter. But the large antenna and powerful
transmitter aboard Magellan made it possible to probe deeper into
the atmosphere with more accuracy than ever before.
The data received from the experiment, which sends a radio
beam through the atmosphere as it dives behind the planet in its
orbit, is still being analyzed.
When the data are completely reduced, accurate profiles of
the temperature and pressure in the Venus atmosphere will be
obtained, Steffes said. Also, an enhanced profile of theabundance of gaseous sulfuric acid which condenses to form the
clouds of Venus will also be acquired.
The experiment was conducted during three successive orbits
on the same day, October 5. Since the experiment was conducted
three times the same day, and any short term variation in the
meteorology of Venus, at the location probed, could be detected.
But to be most useful, a large number of such measurements
conducted at different times and locations would be made, which
would give a better picture of how the climate of Venus varies
with time and location. Steffes said he hoped that such an
opportunity might occur in late 1992.
The October 5 experiment was planned and conducted by a
group of scientists and engineers including Magellan Science Team
member Professor G. Leonard Tyler of Stanford University and
Steffes.
Preliminary analysis of the new radio occultation data
indicates the experiment probed deep into Venus' atmosphere,
reaching to just 33.5 kilometers (20.8 miles) above the surface.
The Magellan Project is managed by the Jet Propulsion
Laboratory for NASA's Office of Space Science and Applications.
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