GRACE-FO Level-2 Monthly Geopotential Spherical Harmonics CSR Release 6.0 (RL06)
DOI10.5067/GFL20-MC060
Short NameGRACEFO_L2_CSR_MONTHLY_0060
DescriptionFOR EXPERT USE ONLY. This dataset contains estimates of the total month-by-month geopotential of the Earth, derived from the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission measurements, produced by the Center for Space Research (CSR) at University of Texas at Austin. The data are provided in spherical harmonic coefficients, averaged over approximately a month. The primary objective of the GRACE-FO mission is to obtain accurate estimates of the mean and time-variable components of the gravity field and corresponding Earth mass change variations, such as from polar ice sheets and mountain glaciers; total water storage on land (from groundwater changes in deep aquifers to changes in soil moisture and surface water); changes in deep ocean currents; and changes within the solid Earth itself, such as postglacial rebound and the impact of major earthquakes. This objective is achieved by making continuous measurements of the change in distance between twin spacecraft, co-orbiting in about 490 km altitude, near circular, polar orbit, spaced approximately 220+/-50 km apart, using a microwave ranging system. In addition to these inter-satellite range changes, the non-gravitational forces acting on each satellite are measured using a high accuracy electrostatic accelerometer. The satellite orientation and position (and timing) are precisely measured using star cameras (with three heads per satellite) and a GPS receiver. Spatial and temporal variations in the gravity field perturb the orbits (or trajectories) of the twin spacecraft differently. These differences lead to minute changes (on the order of tens of micrometers per second) in the distance between the spacecraft as they orbit the Earth. This change in distance (or range rate) 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 geopotential coefficients of an Earth gravity field model, typically on a per-month basis.
Version6
Dataset TypeACTIVE
MeasurementSOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY
Processing Level2
CoverageRegion: GLOBAL
North Bounding Coordinate: 89 degrees
South Bounding Coordinate: -89 degrees
West Bounding Coordinate: -180 degrees
East Bounding Coordinate: 180 degrees
Time Span: 2018-May-22 to Present
Granule Time Span: 2018-Jun-01 to 2021-Feb-28
ResolutionSpatial Resolution: 500 km (Along) x 500 km (Across)
ProjectionProjection Type: Spherical
Projection Detail: N/A
Ellipsoid: WGS 84
Swath Width-1 km
Platform/Sensor
GRACE-FO
Platform
Name: Gravity Recovery and Climate Experiment Follow-On (GRACE-FO)
Orbit Period: -1.0 minutes
Inclination Angle: 89.0 degrees
/
GRACE-FO KBR
SENSOR
Name: GRACE-FO K-Band Ranging System (GRACE-FO KBR)
Swath Width: -1.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

GRACE-FO
Platform
Name: Gravity Recovery and Climate Experiment Follow-On (GRACE-FO)
Orbit Period: -1.0 minutes
Inclination Angle: 89.0 degrees
/
GRACE-FO SCA
SENSOR
Name: GRACE-FO Star Camera Assembly (GRACE-FO SCA)
Swath Width: -1.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

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

GRACE-FO
Platform
Name: Gravity Recovery and Climate Experiment Follow-On (GRACE-FO)
Orbit Period: -1.0 minutes
Inclination Angle: 89.0 degrees
/
GRACE-FO LRI
SENSOR
Name: GRACE-FO Laser Ranging Interferometer (GRACE-FO LRI)
Swath Width: -1.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

ProjectGRACE Follow-On (GRACE-FO)
Data ProviderPublisher: JPL
Creator: GRACE-FO
Release Place: JPL
Release Date: 2019-Jun-10
Resource: https://podaac-tools.jpl.nasa.gov/drive/files/allData/gracefo/docs/

Keyword(s)gravity, GRACEFO, GFO, RL06, CSR
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Citation GRACE-FO. 2019. GRACEFO_L2_CSR_MONTHLY_0060. Ver. 6. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GFL20-MC060

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For more information see Data Citations and Acknowledgments.

Journal Reference Dah-Ning Yuan, 2019, GRACE Follow-On Level-2 Gravity Field Product User Handbook. Jet Propulsion Laboratory, JPL D-103922. https://podaac-tools.jpl.nasa.gov/drive/files/allData/gracefo/docs/GRACE-FO_L2-UserHandbook_v1.0.pdf