Magnetic Equivalent Convection
The time series are available within the framework of the Nordic Virtual Observatory project. This collaboration of Tromsø Geophysical Observatory (TGO), the Finnish Meteorological Institute (FMI), Sodankylä Geophysical Observatory (SGO), and the Swedish Institute of Space Physics (IRF) intends to achieve a higher degree of effectiveness in observations related to external geophysics and to operate a centralized visualization and dissemination of regional core data via the Nordic Space Weather Situation Screen.
On the derivation: Current geomagnetic disturbance represented as Magnetic Equivalent Convection (MEC) vectors. The ionospheric plasma convection here is estimated by the rotation of the geomagnetic H-component vector anticlockwise by 90 degrees. Note that this estimation is only valid if one assumes that the detected ground disturbances are solely caused by the ionospheric Hall currents.