The above is a map of all the observatories on ground, combined with ground footprints of satellite measurements taken on 25 November 2001.
Ionospheric footprints in pink for ESA’s Cluster, in purple for NASA’s Polar and green for the GOES satellites. The projection looks down on the northern hemisphere. The field-of-view of radars of the SuperDARN network is underlined in black. In red, the positions of the CARISMA (University of Alberta, Canada) and SAMNET (Lancaster University, UK) magnetometers chains have been indicated.
12 MLT indicates noon, Magnetic Local Time, or the direction of the Sun, the source of solar wind. 24 MLT indicates the direction opposite to noon, Magnetic Local Time, least affected by solar wind.