We provide in this document general information on the published datasets and keep a log of the updates that we make to the models and datasets. ====================================================== File naming convention ====================================================== The file name starts with two letters indicating the satellite, e.g. "GA" for the GRACE A satellite. The following blocks of letters indicate the type of data. Currently, this is "DNS" for density, "WND" for wind, or "DNS_WND" for density and wind. The following block of letters is either "ACC" when the data is based on accelerometer measurements or "POD" when the data is based only on GNSS measurements. Then, we specify the year and the month and, finally, the version number. ====================================================== List of updates of models and datasets ====================================================== The following list reflects all updates and changes made to the models, datasets, and information provided on our webpage. Update on December 13, 2025: Our FTP server has been replaced by a more secure web server. You can find new links to the data and models below. Update on December 11, 2025: Uploaded POD-derived Swarm density data (version 02) covering October 2025. Update on December 10, 2025: Uploaded POD-derived Swarm density data (version 02) covering September 2025. Update on December 2, 2025: Uploaded accelerometer-derived GRACE-FO density and crosswind data (version 02) covering the period from May to July 2025. Update on October 1, 2025: Uploaded POD-derived Swarm density data (version 02) covering August 2025. Update on September 2, 2025: Uploaded POD-derived Swarm density data (version 02) covering June and July 2025. Update on July 28, 2025: Uploaded accelerometer-derived GOCE density and crosswind data (version 02) covering the all science operations from November 2009 to October 2013. The dataset resulted from a full reprocessing, in which we improved the radiation pressure modeling and filled many data gaps. A publication by Hładczuk et al. on this dataset is currently under review. Update on July 21, 2025: Uploaded accelerometer-derived Swarm C density data (version 01) covering the period from November 2024 to April 2025. Update on July 11, 2025: Uploaded POD-derived Swarm density data (version 02) covering May 2025. Update on June 30, 2025: Uploaded accelerometer-derived Swarm A density data (version 01) covering the period from November 2015 to December 2016. Update on June 17, 2025: Uploaded accelerometer-derived GRACE C density and crosswind data (version 02c) covering the period from January to April 2025. Update on June 2, 2025: Uploaded POD-derived Swarm density data (version 02) covering April 2025. Update on May 7, 2025: Uploaded POD-derived Swarm density data (version 02) covering February and March 2025. Update on March 18, 2025: Uploaded POD-derived Swarm density data (version 02) covering January 2025. Update on March 16, 2025: Uploaded POD-derived Swarm density data (version 02) covering the period from 2014 to 2024. We implemented a new processing method in this new version, in which the smoothing adapts to the expected signal strength. The method maximises the density signal-to-noise ratio, substantially increasing the data quality. Update on January 28, 2025: Uploaded accelerometer-derived GRACE C density and crosswind data (version 02c) covering the period from June to December 2024. Update on December 7, 2024: Uploaded accelerometer-derived Swarm A, B, and C density data (version 01) covering May 2024. Update on August 28, 2024: Uploaded accelerometer-derived Swarm C density data (version 01) covering January to April 2024. Update on August 23, 2024: Uploaded accelerometer-derived Swarm A density data (version 01) covering January to October 2015 and accelerometer-derived Swarm C density data (version 01) covering August to December 2023. Update on July 9, 2024: Uploaded POD-derived Swarm density data (version 01) covering May 2024. Update on July 8, 2024: Uploaded accelerometer-derived GRACE C density and crosswind data (version 02c) covering February to May 2024. Update on May 28, 2024: Uploaded POD-derived Swarm density data (version 01) covering April 2024. Update on May 8, 2024: Uploaded POD-derived Swarm density data (version 01) covering March 2024. Update on April 27, 2024: Uploaded a new version (v02c) of accelerometer-derived GRACE C density and crosswind data, featuring an improved accelerometer data calibration that significantly improves the early years, particularly 2018 and 2019. Density data has been reprocessed for the entire mission and crosswind data are available from January 2023 onward. Update on March 22, 2024: Uploaded POD-derived Swarm density data (version 01) covering February 2024. Update on February 28, 2024: Uploaded POD-derived Swarm density data (version 01) covering January 2024. Update on January 22, 2024: Uploaded POD-derived Swarm density data (version 01) covering December 2023. Update on January 16, 2024: Uploaded new GRACE-FO density and crosswind data (version 02b) covering September and October 2023. Update on January 4, 2024: Uploaded accelerometer-derived Swarm density data (version 01) covering March 2023 - July 2023. Update on January 4, 2024: Uploaded POD-derived Swarm density data (version 01) covering November 2023. Update on December 27, 2023: Uploaded new GRACE-FO data (version 02b) covering the period from launch in May 2018 to August 2023. Version 02b implements an upgrade in radiation pressure modeling, which has a marginal impact on the density data, but significantly improves the crosswind data. The latter is released from January 2023 onward since the signal-to-noise ratio was sufficient only in this period. Update on November 27, 2023: Uploaded POD-derived Swarm density data (version 01) covering October 2023. Update on October 24, 2023: Uploaded POD-derived Swarm density data (version 01) covering September 2023. Update on September 22, 2023: Uploaded POD-derived Swarm density data (version 01) covering August 2023. Update on August 22, 2023: Uploaded POD-derived Swarm density data (version 01) covering July 2023. Update on August 2, 2023: Uploaded POD-derived Swarm density data (version 01) covering May and June 2023. Update on June 13, 2023: Uploaded ACC-derived Swarm density data (version 01) covering March 2015. Update on June 1, 2023: Uploaded POD-derived Swarm density data (version 01) covering April 2023. Update on May 24, 2023: Uploaded accelerometer-derived Swarm C density data (version 01) covering March - October 2022 and POD-derived Swarm density data (version 01) covering March 2023. Update on May 19, 2023: Our paper describing the CHAMP, GRACE, and GRACE-FO version 2 density and crosswind datasets has been accepted for publication in the Journal of Space Weather and Space Climate. You can read it here. Update on April 12, 2023: Uploaded POD-derived Swarm density data (version 01) covering February 2023 and filled data gaps in the POD-derived Swarm density data (version 01) of Swarm A and C covering May and June 2022. Update on March 15, 2023: We distribute the density and crosswind data under Creative Commons Attribution 4.0 International (CC BY 4.0) license. Satellite geometry, aerodynamic, and radiation pressure models are shared under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) license. Update on March 8, 2023: Uploaded accelerometer-derived GRACE-FO 1 (GRACE C) density data (version 02) covering April - November 2022. Update on March 1, 2023: Uploaded POD-derived Swarm density data (version 01) covering January 2023. Update on February 28, 2023: Uploaded the CHAMP, GRACE, and GRACE-FO satellites' radiation pressure, aerodynamic, and geometry models, which we used to generate version 02 of the density and crosswind observations. Update on February 27, 2023: Uploaded new GRACE A and B crosswind data covering 2002 and 2003. Further, we improved the flagging for the entire GRACE crosswind data in this update (version 02b). Update on January 26, 2023: Uploaded POD-derived Swarm density data (version 01) covering December 2022. Major update on January 1, 2023: Uploaded version "02" of CHAMP density and crosswind data for the entire mission. Update on December 30, 2022: Uploaded POD-derived Swarm density data (version 01) covering October and November 2022. Update on October 26, 2022: Uploaded POD-derived Swarm density data (version 01) covering September 2022. Update on September 27, 2022: Uploaded POD-derived Swarm density data (version 01) covering August 2022. Update on September 5, 2022: Uploaded POD-derived Swarm density data (version 01) covering June and July 2022. Update on July 18, 2022: Uploaded files that identify crossovers and orbital plane alignments of the CHAMP, GOCE, GRACE, GRACE-FO, and Swarm satellites. The files are part of the version "02" datasets. Major update on July 15, 2022: Uploaded version "02" of accelerometer-derived density data for GRACE A and B for the entire mission, GRACE C (also known as GRACE-FO 1) from launch until March 2022, and accelerometer-derived crosswind data for GRACE A and B from October 2011 until the end-of-mission. Update on July 1, 2022: Uploaded POD-derived Swarm A, B, and C density data covering May 2022. Some days have been omitted because of the orbit raise manoeuvres. Update on June 10, 2022: Uploaded accelerometer-derived Swarm C density data covering February 2022 and POD-derived Swarm A, B, and C density data covering March and April 2022. Update on April 13, 2022: Uploaded accelerometer-derived Swarm C density data covering November and December 2021, and January 2022. Update on April 3, 2022: Uploaded accelerometer-derived Swarm C density data covering September and October 2021. Update on March 23, 2022: Uploaded POD-derived Swarm density data covering February 2022. Update on March 2, 2022: Uploaded POD-derived Swarm density data covering January 2022 and accelerometer-derived Swarm C density data covering August 2021. Update on January 24, 2022: Uploaded POD-derived Swarm density data covering December 2021. Update on December 28, 2021: Uploaded accelerometer-derived Swarm A density data covering February - December 2014. (Note that in earlier announcements "accelerometer-derived Swarm density data" refers to data from Swarm C only. From now on, we will distinguish between Swarm A, B, and C.) Update on December 24, 2021: Uploaded POD-derived Swarm density data covering November 2021. Update on December 23, 2021: The files containing the accelerometer-derived Swarm density data covering October and November 2014 have been replaced to fill the data gap from 13 October - 7 November 2014. Update on December 19, 2021: Uploaded accelerometer-derived Swarm density data covering June - July 2021. In addition, the files containing the accelerometer-derived Swarm density data covering April - May 2021 have been replaced to fill the data gap from 22 April - 3 May 2021. Update on December 18, 2021: Uploaded POD-derived Swarm density data covering September and October 2021. Update on September 27, 2021: Uploaded POD-derived Swarm density data covering August 2021. Update on August 27, 2021: Uploaded POD-derived Swarm density data covering July 2021. Update on August 7, 2021: Uploaded accelerometer-derived Swarm density data covering March-May 2021. Update on July 26, 2021: Uploaded POD-derived Swarm density data covering June 2021. Update on June 30, 2021: Uploaded POD-derived Swarm density data covering April and May 2021. Update on June 2, 2021: Uploaded accelerometer-derived Swarm density data covering January and February 2021. Update on April 28, 2021: Uploaded POD-derived Swarm density data covering March 2021. Update on March 31, 2021: Uploaded POD-derived Swarm density data covering February 2021. Update on March 10, 2021: Uploaded CHAMP crosswind data for 2009 and 2010 (12 new files). Update on March 2, 2021: Uploaded POD-derived Swarm density data covering January 2021. Update on February 20, 2021: Uploaded accelerometer-derived Swarm density data covering October-December 2020. Update on February 2, 2021: Uploaded POD-derived Swarm density data covering December 2020. Update on January 7, 2021: Uploaded POD-derived Swarm density data covering November 2020. Update on December 9, 2020: Uploaded accelerometer-derived Swarm density data covering September 2020. Update on December 1, 2020: Uploaded POD-derived Swarm density data covering October 2020. Update on November 6, 2020: Uploaded accelerometer-derived Swarm density data covering August 2020. Update on November 2, 2020: Uploaded POD-derived Swarm density data covering September 2020. Update on September 30, 2020: Uploaded POD-derived Swarm density data covering August 2020. Update on September 16, 2020: Uploaded accelerometer-derived Swarm density data covering May-July 2020. Update on August 27, 2020: Uploaded POD-derived Swarm density data covering June and July 2020. Update on July 17, 2020: Uploaded POD-derived Swarm density data covering May 2020 and accelerometer-derived Swarm density data for August-November 2019 and February-March 2020. Update on June 4, 2020: Uploaded POD-derived Swarm density data covering April 2020. Update on May 7, 2020: Uploaded POD-derived Swarm density data covering March 2020. Update on April 22, 2020: Reprocessed all CHAMP density and replaced all CH_DNS_ACC files. The reprocessing filled a number of data gaps and extended the density time series to September 2010. Existing data is practically unchanged. Update on April 10, 2020: New Swarm POD-derived density data for Nov-2019 to Feb-2020 uploaded (SW_DNS_POD files) Update on April 10, 2020: 8 existing files replaced due to reprocessing manoeuvre data: SA_DNS_POD_2019_04_v01.txt SA_DNS_POD_2019_05_v01.txt SA_DNS_POD_2019_10_v01.txt SB_DNS_POD_2018_04_v01.txt SB_DNS_POD_2018_10_v01.txt SB_DNS_POD_2019_04_v01.txt SC_DNS_POD_2019_04_v01.txt SC_DNS_POD_2019_10_v01.txt Update on February 24, 2020: Accelerometer-derived density data of Swarm C for Jan-2018 to Jul-2019 uploaded (SW_DNS_ACC files) Update on January 22, 2020: New article published: J. van den IJssel, E. Doornbos, E. Iorfida, G. March, C. Siemes, O. Montenbruck (2020) Thermosphere densities derived from Swarm GPS observations. Advances in Space Research. https://doi.org/10.1016/j.asr.2020.01.004