A new index to monitor temporal and long-term variations of the equatorial electrojet by MAGDAS/CPMN real-time data: EE-index

A new index. EE-index (E Dst. EU, and EL), is proposed to monitor temporal and long-term variations of the equatorial electrojet by using g the MAGDAS/CPMN real-time data. The mean value of the H component magnetic variations observed at the nightside (LT = 18-06) MAGDAS/CPMN stations along the magnetic equatorial region is found to show variations similar to those of Dst: we defined this quantity as E Dst. The E Dst can be used as proxy of Dst for the real-time and long-time geospace monitoring. By subtracting E Dst from the H component data of each equatorial station, it is possible to extract the Equatorial Electrojet and Counter Electrojet components, which are defined as EU and EL, respectively.