Minimize Swarm Operational News

New Swarm acceleration and thermosphere density data released

24 November 2017

We are pleased to announce the new release of non-gravitational acceleration and thermosphere neutral density data, which were derived from the measurements of the GPS receiver. The newly released data cover the period covering the start of the mission until 19 July 2014. Hence, the available time series is now complete until 31 August 2017 for all three Swarm satellites.

In addition to this, we have released new non-gravitational acceleration data, that are determined through a combination of the non-gravitational acceleration derived from the GPS receiver, and the measurements of the accelerometer. The new data cover the period from 19 July 2014 to 27 April 2016 for the Swarm C satellite. Due to the incorporation of the accelerometer measurements, these data have a higher resolution along the orbit as compared to those derived only from the measurements of the GPS receiver. The key differences from the previous dataset are a better calibration of the accelerometer measurements and the use of the latest non-gravitational acceleration data derived only from the measurements of the GPS receiver, ensuring that the two types of recently available non-gravitational acceleration data are consistent.

The non-gravitational acceleration and thermosphere neutral density data derived only from the measurements of the GPS receiver are contained in the products ACCxPOD_2 baseline 02 and DNSxPOD_2 baseline 01, respectively, and located in the following directories on the ESA FTP server:

  • /Level2daily/Latest_baselines/ACC/POD/
  • /Level2daily/Latest_baselines/TDW/POD/

The non-gravitational acceleration data determined through a combination of the non-gravitational acceleration derived from the GPS receiver and the measurements of the accelerometer are contained in the products ACCxCAL_2 baseline 02, and located in the following directory on the ESA FTP server:

  • /Level2daily/Latest_baselines/ACC/CAL/