Open Access

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

Earth, Planets and Space200860:BF03352828

https://doi.org/10.1186/BF03352828

Received: 27 August 2007

Accepted: 28 March 2008

Published: 4 August 2008

Abstract

A new index, EE-index (EDst, EU, and EL), is proposed to monitor temporal and long-term variations of the equatorial electrojet by using theMAGDAS/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 EDst. The EDst can be used as a proxy of Dst for the real-time and long-term geospace monitoring. By subtracting EDst 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.

Key words

EE-index equatorial electrojet counter electrojet MAGDAS/CPMN real-time monitoring Dst index space weather