EIGEN-CHAMP03S

CHAMP-only Earth Gravity Field Model derived from 33 months of CHAMP data

EIGEN-CHAMP03S Gravity Anomalies (a=6378136.46, 1/f=298.25765) in mgal

EIGEN-CHAMP03S Geoid (a=6378136.46, 1/f=298.25765) in meter

EIGEN-CHAMP03S is a CHAMP-only gravity field model derived from CHAMP GPS satellite-to-satellite and accelerometer data out of the period October 2000 through June 2003. EIGEN-CHAMP03S is the final version of the preliminary model EIGEN-3p and results from a homogeneous reprocessing of all normal equations including the improved parametrization of the accelerometer calibration parameters. Normal equation regularisation starts at degree 60.

Please note: although higher-degree/order terms are solved in EIGEN-CHAMP03S, the solution has full power only up to about degree/order 60 due to signal attenuation in the satellite's altitude. Higher degree/order terms are solvable applying regularization of the normal equation system. The accuracy of EIGEN-CHAMP03S is about 5 cm and 0.5 mgal in terms of geoid heights and gravity anomalies, respectively, at lamda/2=400 km.

The EIGEN-CHAMP03S solution:

• Contains fully normalized spherical harmonic coefficients complete to degree/order l,m=120 plus selected terms for CHAMP sensitive and resonant orders up to degree 140,
• permanent tide is not included in C(2,0): tide-free system,
• C(0,0) and C(l,0)-dot (l=2,3,4) are not solved for, but fixed to their initial values, C(l,0) reference period: Jan 1, 1997;
  C(2,1),S(2,1) coefficients are solved as polygon at about 6 months intervals.
• Standard deviations are given along with the coefficients. The standard deviations were a posteriori calibrated applying degree dependent calibration factors (cf. header of EIGEN-CHAMP03S data set).
• The EIGEN-CHAMP03S correlation matrix of the spherical harmonic coefficients is available as a CHAMP OG Level 4 product through the Information System and Data Centre (ISDC).
• The formats are described on the CHAMP web pages (www.gfz-potsdam.de/champ) under References & More 'Online Available Documents in the document' 'CHAMP gravity field solution data formats'.

The EIGEN-CHAMP03S solution should be referenced as:

Reigber, Ch., Jochmann, H., Wünsch, J., Petrovic, S., Schwintzer, P., Barthelmes, F., Neumayer, K.-H., König, R., Förste, Ch., Balmino, G., Biancale, R., Lemoine, J.-M., Loyer, S., Perosanz, F.: Earth Gravity Field and Seasonal Variability from CHAMP . In: Reigber, Ch., Lühr, H., Schwintzer, P., Wickert, J. (eds.), Earth Observation with CHAMP - Results from Three Years in Orbit, Springer, Berlin, 25-30, 2004.