- Letter
- Open Access
A new index to monitor temporal and long-term variations of the equatorial electrojet by MAGDAS/CPMN real-time data: EE-Index
- T. Uozumi110Email author,
- K. Yumoto110,
- K. Kitamura210,
- S. Abe110,
- Y. Kakinami110,
- M. Shinohara110,
- A. Yoshikawa110,
- H. Kawano110,
- T. Ueno310,
- T. Tokunaga310,
- D. McNamara410,
- J. K. Ishituka510,
- S. L. G. Dutra610,
- B. Damtie710,
- V. Doumbia810,
- O. Obrou810,
- A. B. Rabiu910,
- I. A. Adimula1010,
- M. Othman1110,
- M. Fairos1110,
- R. E. S. Otadoy1210 and
- MAGDAS Group110
https://doi.org/10.1186/BF03352828
© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2008
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.
