A-CHAIM Test Period September 21st, 2021 through September 29th, 2021

A-CHAIM is an operational, near-real-time ionospheric data assimilation, incorporating measurements from GNSS stations, ionosondes, and vertical TEC from the JASON-3 satellite. Output files from the offline A-CHAIM test run from September 21st, 2021 through September 29th, 2021. Included is the software required to read the output files, in C and MATLAB. The reference datasets are also included, consisting of in-situ plasma density measurements from the SWARM and DMSP missions, as well as manually processed data from the Sodankyla, Pond Inlet, Svalbard, and Blissville ionosondes.