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Transcript of GRACE Satellite
Oceanographers, hydrologist and geologists are some of the many that uses this data.
how does GRACE help the human race?
It measures the size of the polar ice caps and oceans, which in turn can help evaluate issues with global warming.
Data from GRACE
When Was GRACE Launched?
Gravity Recovery And Climate Experiment
How High is GRACE in Orbit and how fast does it go?
by: Grace V.
GRACE is a twin satellite that is very important to us.
GRACE was launched March 17, 2002 at 12:21 pm
GRACE is 500 kilometers (311 miles) high.
The speed of the satellites are dependent on where they are and whether the gravity is increased. As the satellite is pulled toward the area of higher gravity it speeds up. As the trailing satellite passes the area of higher gravity it will slow down and the lead satellite will not be affected.
Although GRACE was expected to be in orbit and still accurately map Earth's gravity for only 5 years, GRACE has been mapping since 2002
People who build it include physicist, mechanical engineers, hydrologist, geologist, civil engineer, electrical engineers.
People who helped build GRACE
Education to become a Hydrologist
To work as an entry-level hydrologist one usually needs a master's degree in geoscience, environmental science or engineering with a concentration in hydrology or water sciences.
What satellite and data does a hydrologist use?
They use the GRACE satellite and its mapping data along with hydrologic modeling to observe dynamic changes in ground water over large regions or where well data is sparse.
would i like to become a hydrologist
A hydrologist studys of the movement, distribution, and quality of water on Earth and other planets, including the hydrologic cycle, water resources and environmental watershed sustainability
I would prefer not to become a hydrologist for many reasons. First, studying water would not fascinate me. Next, being a hydrologist requires years of education. I personally would much rather not go through anymore school than i already have to. Finally, I enjoy science for school related activities, but having to focus on nothing science for years simply is not my thing.
The map above is is one of the many examples of data that GRACE gives us.The map shown above lets us observe monthly changes in gravity that are caused by monthly changes in mass.
"GRACE - Gravity Recovery and Climate Experiment."
GRACE - Gravity Recovery and Climate Experiment.Univerity of Texas, n.d. Web. 03 Mar. 2014.
"Scientific Instrument(s)." Jet Propulsion
Laboratory. NASA, n.d. Web. 03 Mar. 2014
"GRACE Fact Sheet : Feature Articles." GRACE
Fact Sheet : Feature Articles. NASA, n.d. Web. 02 Mar. 2014.
"Missions - GRACE - NASA Science." Missions -
GRACE - NASA Science. NASA, n.d. Web. 02 Mar. 2014.
"GRACE Tellus: GRACE MONTHLY MASS
GRIDS - OVERVIEW." GRACE Tellus: GRACE MONTHLY MASS GRIDS - OVERVIEW. NASA, n.d. Web. 04 Mar. 2014.
How GRACE works
K-band Ranging System (KBR). Provides precise (within 10 µm) measurements of the distance change between the two satellites needed to measure fluctuations in gravity.
Ultra Stable Oscillator (USO). Provides frequency generation for the K-band ranging system.
SuperSTAR Accelorometers (ACC). Precisely measures the non-gravitational accelerations acting on the satellite.
Star Camera Assembly (SCA). Precisely determines the two satellites’ orientation by tracking them relative to the position of the stars.
Coarse Earth and Sun Sensor (CES). Provides omnidirectional, reliable, and robust, but fairly coarse, Earth and Sun tracking. Used during initial acquisition and whenever GRACE operates in safe mode.
Center of Mass Trim Assembly (MTA). Precisely measures the offset between the satellite’s center of mass and the “acceleration-proof” mass and adjusts center of mass as needed during the flight.
Black-Jack GPS Receiver and Instrument Processing Unit (GPS). Provides digital signal processing; measures the distance change relative to the GPS satellite constellation.
Globalstar Silicon Solar Cell Arrays (GSA). Covers the outer shell of the spacecraft and generates power.
Whats it purpose?
The GRACE Satellites are suppose to accurately map Earth's gravity field.
Are there hydrologist in Flagstaff?
Yes, there are hydrologist in Flagstaff, and they are also firms.