nasa.S.

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S. Jason precisely maps the surface height, wind speed and wave height
of 95 percent of Earth's ice-free oceans every 10 days.

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The global data from these satellites are used extensively in NOAA's weather
and climate prediction models. NOAA polar-orbiting satellites detect emergency beacon distress
signals and relay their location to ground stations, so rescue can be
dispatched.html

http://www.

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There is one more satellite in this series scheduled for launch in December
2007.
NOAA manages the POES program and establishes requirements, provides all
funding and distributes environmental satellite data for the United States .gov

http://nws. The spacecraft lost its ability to maneuver, bringing
to a close a successful 13-year mission. JPL manages the U.

impacts warnings

NASA's comprehensive on-orbit verification
period is expected to last approximately 45 days after launch.noaa.
The joint effort had its genesis in 1979, when NASA began developing the
TOPEX mission, while the Centre National d'Etudes Spatiales was planning a
similar one called Poseidon.

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NOAA-N has imaging and sounding capabilities that are broadcast
around the world and recorded on board for playback over NOAA ground stations . "Its data made a huge
difference in our understanding of the oceans and their affect on global
climatic conditions.

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For information about both missions on the Web, visit:

http://sealevel.nasa.

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"NASA is proud of our role in building and launching these satellites
which contribute to NOAA's vital mission of providing weather forecasts and
collecting environmental data about the Earth," said Karen Halterman, NASA
POES Project Manager, Goddard Space Flight Center , Greenbelt, Md.

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The spacecraft, NOAA-N, will lift off at 6:22 a. and more than 18,000 worldwide .gsfc.

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NPOESS is a combined program with NOAA, the Department of Defense
and NASA.gov/noaa-n

http://goespoes.

typhoon impacts

Helens, to
bolstering the U. SARSAT is credited with saving approximately 5,000 lives in the
U.
Twenty-one days after the satellite is launched , NASA will transfer
operational control to NOAA."
TOPEX/Poseidon data have helped in hurricane and El Nino/La Nina
forecasting, ocean and climate research, ship routing, offshore industries,
fisheries management, marine mammals' research, modernizing global tide models
and ocean debris tracking.

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, " said Gregory Withee, assistant administrator for NOAA's Satellite and
Information Service.
NASA 's Goddard Space Flight Center procures and manages the development and
launch of the satellites for NOAA on a cost-reimbursable basis.nasa.gov

http://www.

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S. The agencies formed a single mission in 1983, and
it was launched Aug.gov

http: //www.

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WASHINGTON, The joint NASA/Centre National d'Etudes
Spatiales TOPEX/Poseidon oceanography satellite ceased operations after nearly
62,000 orbits of Earth. Ground controllers
concluded the wheel was not functioning and ended the mission.
"TOPEX/Poseidon was a unique mission that attracted users around the
world, including more than 600 scientists in 54 countries," said Yves Menard,
TOPEX/ Poseidon project scientist at Centre National d'Etudes Spatiales in
Toulouse, France .

Weather is the state of the atmosphere at a given time and place, with respect to variables such as temperature, moisture, wind velocity, and barometric pressure.

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nasa. "It
provided, on average, more than 98 percent of the science data it was designed
to collect in every 10-day measurement cycle , a remarkable achievement. portion of
TOPEX/Poseidon/Jason for NASA's Science Mission Directorate .

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NASA + NOAA Set to Launch New Environmental Satellite

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"From monitoring the ash clouds of Mount St. search and rescue network, NOAA-N will be the link in our
continued success," he added.
NOAA-N will replace NOAA-16, in operation since September 2000, and join
NOAA-17, launched in June 2002.
NOAA-N also has instruments used in the international Search and Rescue
Satellite-Aided Tracking System, called COSPAS-SARSAT, which was established
in 1982.
NOAA's next generation of polar spacecraft, the National Polar-Orbiting
Operational Environmental Satellite System (NPOESS ), is planned for launch in
early 2010.noaa.com

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EDT, May 11, 2005, from
Vandenberg Air Force Base, Calif.
As it orbits the globe, NOAA-N will collect data about the Earth's surface
and atmosphere that are input for NOAA's long-range climate and seasonal
outlooks, including forecasts for El Nino and La Nina.
TOPEX/Poseidon's data have been the subject of more than 2,100 research
publications; major science and application achievements include:

- the first decade -long global descriptions of seasonal and yearly ocean
current changes
- refined scientists ' estimates of rising global sea level during the
past decade
- provided a new understanding of the role tides play in mixing the deep
ocean
- developed the most accurate ever global ocean tides' models
- provided the first global data set to test ocean general circulation
model performance
- demonstrated global positioning system measurements in space could
determine spacecraft positions with unprecedented accuracy, enabling
rapid delivery of data

Jason, a follow-on oceanography mission launched in December 2001, is
continuing TOPEX/Poseidon's study of ocean circulation affects on the Earth's
climate. It also improved understanding of how low-frequency ocean waves
transmit signals of climate change.

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m.S. 10, 1992.jpl.

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NOAA maintains a constellation of two primary polar-orbiting satellites.

NASA'S Topex/Poseidon Oceanography Mission Ends

The wheel helps
keep the spacecraft in proper orbital orientation.

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"TOPEX/Poseidon was built to fly up to five years, but it became history's
longest Earth-orbiting radar mission, " said TOPEX/Poseidon Project Scientist
Lee-Lueng Fu of NASA's Jet Propulsion Laboratory (JPL), Pasadena , Calif. The satellite
is in orbit 830 miles above the Earth, posing no threat to the planet. The data provide
invaluable input for short-term weather forecasting, long-term climate
forecasting and prediction models. This allowed the study
of smaller-scale ocean phenomena like coastal tides , ocean eddies and
currents.
Beyond Jason, the Ocean Surface Topography Mission is in development for a
scheduled launch in 2008.

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gov

"
The satellite's pitch reaction wheel stalled in October.
TOPEX/Poseidon's stellar performance allowed it to fly in tandem with
Jason for nearly three years, doubling data collection. For NASA JPL
information call: Alan Buis, (818) 354 -0474.

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WASHINGTON, NASA is set to launch the new National
Oceanic and Atmospheric Administration (NOAA) Polar-orbiting Operational
Environmental Satellite (POES), another critical link in the development of a
global Earth-observation program. Once in orbit, NOAA-N will be renamed NOAA-
18.
NOAA-N is the fifteenth in a series of polar-orbiting satellites dating
back to 1978.gov/home/index .
"TOPEX/Poseidon revolutionized the study of Earth's oceans, providing the
first continuous , global coverage of ocean surface topography and allowing us
to see important week-to-week oceanic variations," said Mary Cleave, associate
administrator for NASA's Science Mission Directorate.oceanobs .

prediction phenomena

"The NOAA-N satellite is key to establishing a strong Global Earth
Observation System of Systems, because it will strengthen our understanding
about what the environment around the world is doing, not just here in the
U.
For information about NASA, NOAA-N and polar orbiting satellites on the
Web, visit:

http://www.

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It will continue providing high-precision sea
surface height data to the oceanographic science community. Centre National
d'Etudes Spatiales manages the French portion of both missions.aviso.

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