Process of providing the LSTID activity index by the TechTIDE European and South African Digisonde Network

Time plot of the Large Scale Travelling Ionospheric Disturbances (LSTID) over European and South African Digisonde stations, providing the relative standard deviation of the critical frequency of the F2 layer of the ionosphere (foF2) within an hour, updated every 15 min. The product provides the current level of ionospheric perturbation to warn space and ground systems' operators for activity related to large scale travelling ionospheric disturbances.