GFZ Potsdam, Department 1

The GRACE Mission

Co-Principal Investigator: Dr.-Ing. Frank Flechtner




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EIGEN-CG01C
New: Combined gravity field model EIGEN-5C complete to degree and order 360 from GRACE, Lageos and surface gravity data, released on September 29, 2008

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Next GRACE Science Team Meeting will take place on November 11-12, 2010 at GFZ.
New combined gravity field model EIGEN-5C complete to degree and order 360 from GRACE, Lageos and surface gravity data, released on September 29, 2008
New GRACE flyer available: 578Kb pdf-file
Combined gravity field model EIGEN-GL04C, released on March 31, 2006
GRACE Data Center (ISDC)
International Centre for Global Earth Models (ICGEM)
Gravity field model EIGEN-GRACE02S: Download data
Regularly updated GRACE occultation results
The University of Texas Center for Space Research
DLR GRACE website
GRACE Newsletter
GRACE related press releases

History of GRACE/CHAMP related press
GRACE related meetings
>Next GRACE Science Team Meeting on November 5-6, 2009 at UTCSR: Visit http://www.csr.utexas.edu/grace/GSTM/
>Dec 12-13, 2008: The next GRACE Science Team Meeting will be held in San Francisco, California. Registration is now open at http://www.csr.utexas.edu/grace/GSTM/.
>June23-27 2008 GGEO2008 IAG Symposium, Gravity, Geoid and Earth Observation, , Chania, Greece, Session 7: Temporal gravity changes and geodynamics Abstract deadline 29 Februar 2008. Visit http://www.geomatlab.tuc.gr/content/view/53/85/lang,en/ for details.

History of GRACE/CHAMP related meetings

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Introduction

GRACE is a joint project between the National Aeronautics and Space Administration (NASA) and the Deutsches Zentrum f�r Luft- und Raumfahrt (DLR).

The primary objective of the GRACE mission is to provide with unprecedented accuracy estimates of the global high-resolution models of the Earth's gravity field for a period of up to five years. The temporal sequence of gravity field estimates will yield the mean Earth gravity field, as well as a time history of its variability. An secondary science objective of the GRACE mission is to provide several hundred globally distributed profiles each day of excess delay or bending angle of the GPS measurements due to the ionosphere and atmosphere using limb sounding. These can be converted to total electron content and/or refractivity in the ionosphere and troposphere, respectively.

GRACE will succeed the CHAMP mission in the area of Earth gravity field measurements. The anticipated increase in accuracy will be achieved by utilizing two satellites following each other on the same orbital track. These satellites are interconnected by a K-band microwave link to measure the exact separation distance and its rate of change to an accuracy of better than 1 �m/s. To consider precise attitude and non-gravitational forces both satellites will be equiped with star cameras and accelerometers. The position and velocity of the satellites will be measured using onboard GPS antennae.

Contents

General
Science & Mission Background
Science Objectives
constant and time-variable part of the Earth Gravity Field Recoverery, Atmospheric Limb Sounding, Ionosphere Sounding
Science Results
constant and time-variable part of the Earth Gravity Field Recoverery
Participants
NASA, JPL, CSR, DLR, GFZ, Astrium, Eurockot, Loral
The Satellites
GRACE Satellite Systems
Payload
Satellite Payload Instruments: KBR, ACC, PS, LRR, SCA, CES, USO, CMT
Mission Scenario
Launch, Mission Phases
Gravity Recovery
High Accuracy Geoid
Atmosphere Ionosphere
Atmospheric and Ionospheric Profiling
Products
Level-0 to Level-2 Product Generation
Contact
Contact Information, Addresses of Key Personnel





GFZ, Department 1

Originator: F. Flechtner
, webadmin S. Magnussen