GRACE NON-TIDAL ATMOSPHERE AND OCEAN GEOPOTENTIAL COEFFICIENTS CSR RELEASE 6.0 GAC
DOI10.5067/GRGAC-20C06
Short NameGRACE_GAC_L2_GRAV_CSR_RL06
DescriptionFOR EXPERT USE ONLY. This dataset contains estimates of geopotential field derived from the Gravity Recovery and Climate Experiment (GRACE) mission measurements and a non-tidal oceanic and atmospheric model produced by the Center for Space Research (CSR) at University of Texas at Austin. The data are in spherical harmonics averaged over approximately a month. The primary objective of the GRACE mission is to obtain accurate estimates of the mean and time-variable components of the gravity field variations. This objective is achieved by making continuous measurements of the change in distance between twin spacecraft, co-orbiting in about 500 km altitude, near circular, polar orbit, spaced approximately 200 km apart, using a microwave ranging system. In addition to these range change, the non-gravitional forces are measured on each satellite using a high accuracy electrostatic, room-temperature accelerometer. The satellite orientation and position (and timing) are precisely measured using twin star cameras and a GPS receiver, respectively. Spatial and temporal variations in the gravity field affect the orbits (or trajectories) of the twin spacecraft differently. These differences are manifested as changes in the distance between the spacecraft, as they orbit the Earth. This change in distance is reflected in the time-of-flight of microwave signals transmitted and received nearly simultaneously between the two spacecraft. The change in this time of fight is continuously measured by tracking the phase of the microwave carrier signals. The so called dual-one-way range change measurements can be reconstructed from these phase measurements. This range change (or its numerically derived derivatives), along with other mission and ancillary data, is subsequently analyzed to extract the parameters of an Earth gravity field model.
Version6.0
Dataset TypeCOMPLETE
MeasurementGRAVITY > GRAVITY/GRAVITATIONAL FIELD > SOLID EARTH
Processing Level2
CoverageNorth Bounding Coordinate: 88 degrees
South Bounding Coordinate: -88 degrees
West Bounding Coordinate: -180 degrees
East Bounding Coordinate: 180 degrees
Time Span: 2002-Apr-05 to 2017-Jun-30
Granule Time Span: 2002-Apr-05 to 2017-Jun-28
ResolutionSpatial Resolution:
ProjectionEllipsoid: WGS 84
Swath Width-1.0 meters
Platform/Sensor
GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1.0 minutes
Inclination Angle: 89.0 degrees
/
GRACE SCA
SENSOR
Name: Star Camera Assembly (GRACE SCA)

GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1.0 minutes
Inclination Angle: 89.0 degrees
/
GRACE KBR
SENSOR
Name: GRACE K-Band Ranging System (GRACE KBR)
Swath Width: -1.0 meters
Description: Spacecraft angular distance from orbital plane relative to the Equator.

GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1.0 minutes
Inclination Angle: 89.0 degrees
/
GRACE ACC
SENSOR
Name: GRACE SuperSTAR Accelerometer (GRACE ACC)
Swath Width: -1.0 meters
Description: Spacecraft angular distance from orbital plane relative to the Equator.

ProjectGravity Recovery and Climate Experiment (GRACE)
Data ProviderPublisher: CSR
Creator: GRACE
Release Place: JPL
Release Date: 2018-May-10
Keyword(s)gravity, GRACE, CSR, non-tidal, GAC, RL06
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
USER'S GUIDE
GENERAL DOCUMENTATION
Citation GRACE. 2018. GRACE_GAC_L2_GRAV_CSR_RL06. Ver. 6.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GRGAC-20C06

Download Citation
RIS XML JSON-LD

For more information see Data Citations and Acknowledgments.

Journal Reference