Real-time Magnetic Equivalent Convection (MEC)
On the derivation: The ionospheric plasma convection direction and relative intensity here is estimated by the rotation of the geomagnetic H-component vector anticlockwise by 90 degrees (called the Magnetic Equivalent Convection (MEC) vector). Note that this estimation is only valid if one assumes that the detected ground disturbances are solely caused by the ionospheric Hall currents.
The Scandinavian time series are available within the framework of the Nordic Virtual Observatory project of Tromsø Geophysical Observatory (TGO), the Finnish Meteorological Institute (FMI), Sodankylä Geophysical Observatory (SGO), and the Swedish Institute of Space Physics (IRF). The global series are available via bilateral agreements between TGO and the respective observatories.