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Alan Buis, CloudSat (818) 354-0474
Jet Propulsion Laboratory, Pasadena, Calif.
Chris Rink, Calipso (757) 864-6786
NASA Langley Research Center, Hampton, Va.
Erica Hupp/Grey Hautaluoma (202) 358-1237/0668
NASA Headquarters, Washington
News Release: 2006-069 April 28, 2006
NASA Launches Satellites for Weather, Climate, Air Quality Studies
Two NASA satellites were launched Friday from Vandenberg Air Force Base,
Calif., on missions to reveal the inner secrets of clouds and aerosols,
tiny particles suspended in the air.
CloudSat and Calipso - Cloud-Aerosol Lidar and Infrared Pathfinder Satellite
Observations - thundered skyward at 3:02 a.m. PDT atop a Boeing Delta II rocket.
The two satellites will eventually circle approximately 705 kilometers (438 miles)
above Earth in a sun-synchronous polar orbit, which means they will always cross
the equator at the same local time. Their technologies will enable scientists to
study how clouds and aerosols form, evolve and interact.
"Clouds are a critical but poorly understood element of our climate," said Dr.
Graeme Stephens, CloudSat principal investigator and a professor at Colorado State
University, Fort Collins, Colo. "They shape the energy distribution of our climate
system and our planet's massive water cycle, which delivers the freshwater we
drink that sustains all life."
"With the successful launch of CloudSat and Calipso we take a giant step forward
in our ability to study the global atmosphere," said Calipso Principal Investigator
Dr. David Winker of NASA's Langley Research Center, Hampton, Va. "In the years to
come, we expect these missions to spark many new insights into the workings of Earth's
climate and improve our abilities to forecast weather and predict climate change."
Each spacecraft will transmit pulses of energy and measure the portion of the pulses
scattered back to the satellite. CloudSat's Cloud-Profiling Radar is more than 1,000
times more sensitive than typical weather radar. It can detect clouds and distinguish
between cloud particles and precipitation. Calipso's polarization lidar can detect
aerosol particles and distinguish between aerosol and cloud particles. Lidar, similar
in principle to radar, uses reflected light to determine the characteristics of the target area.
Sixty-two minutes after liftoff, Calipso separated from the rocket's second stage.
CloudSat followed 35 minutes later. Ground controllers successfully acquired signals
from both spacecraft, and initial telemetry reports show both to be in excellent health.
Over the next six weeks, system and instrument checks will be performed, and the satellites
will be inserted into their final orbits.
The satellites will fly in formation as members of NASA's "A-Train" constellation,
which also includes NASA's Aqua and Aura satellites and a French satellite known as
Parasol, for Polarization and Anisotropy of Reflectances for Atmospheric Sciences
coupled with Observations from a Lidar. The satellite data will be more useful when
combined, providing insights into the global distribution and evolution of clouds to
improve weather forecasting and climate prediction.
For more information about CloudSat and Calipso, visit:
http://www.nasa.gov/cloudsat ; and
http://www.nasa.gov/calipso .
CloudSat is managed by NASA's Jet Propulsion Laboratory, Pasadena, Calif. JPL also
developed the radar instrument with hardware contributions from the Canadian Space Agency.
Colorado State University provides scientific leadership and science data processing and
distribution. Ball Aerospace and Technologies Corp., Boulder, Colo., designed and built
the spacecraft. The U.S. Air Force and U.S. Department of Energy contributed resources.
U.S. and international universities and research centers support the mission science team.
Calipso is a collaboration between NASA and France's Centre National d'Etudes Spatiales (CNES).
Langley is leading the Calipso mission and providing overall project management, systems
engineering, and payload mission operations. NASA's Goddard Space Flight Center, Greenbelt,
Md., provides support for system engineering, project and program management. The French
Space Agency is providing a Proteus spacecraft developed by Alcatel Space, a radiometer
instrument, and spacecraft mission operations. Hampton University, Hampton, Va., is providing
scientific contributions and managing the outreach program. Ball Aerospace developed the lidar
and on-board visible camera.
NASA's Launch Services Program at Kennedy Space Center, Fla., procured the mission's
launch and provided the management for the mission's launch service.
JPL is managed for NASA by the California Institute of Technology.
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