R index from IMAGE magnetometers

The R index calculated from all magnetometer data in the IMAGE database (https://space.fmi.fi/image/www/). Data cover the time period from 1 Jan 2000 to 31 Dec 2025 (insofar each of the magnetometers was operational in that period), and have a time resolution of 10 seconds. Magnetometer noise has been removed from these data. Data are stored in csv format, in files which have been zipped using 7zip. Each file contains all data from one magnetometer station. The header of each file gives the name and code name of the station, and the geographic and magnetic coordinates. The syntax is defined in the last header line.