A. Jäggi(1), U. Meyer(1), M. Lasser(1), F. Flechtner(2), C. Dahle(2), C. Förste(2), T. Mayer-Gürr(3), A. Kvas(3), J.-M. Lemoine(4), S. Bourgogne(5), M. Weigelt(6), A. Groh(7)

  1. Astronomical Institute,University of Bern, Switzerland (adrian.jaeggi@aiub.unibe.ch)
  2. GFZ German Research Centre for Geosciences, Germany
  3. Institute of Geodesy, Graz University of Technology, Austria
  4. Department of Terrestrial and Planetary Geodesy, Centre National d’Etudes Spatiales, France
  5. Stellar Space Studies, France
  6. Institut für Erdmessung, University of Hannover, Germany
  7. Institut für Planetare Geodäsie, Technische Universität Dresden, Germany

In the frame of the European Gravity Service for Improved Emergency Management (EGSIEM), a prototype service was established to combine monthly gravity field solutions from the past US-German GRACE and the current GRACEFollow-On mission in order to deliver improved gravity field solutions for applications in Earth and environmental science research. This prototype has recently been transitionedinto the Combination Service for Time-variable Gravity Field Solutions (COST-G), a Product Center of the International Gravity Field Service (IGFS) of the International Association of Geodesy (IAG).

We report on the achievements made so far and the transition of the prototype phase into regular operation organized by an international team formed at the International Space Science Institute (ISSI) in Bern, Switzerland. We also present the comparison, validation and combination of the latest GRACE gravity field time-series.