Skip to main content

Sq and sfe currents at equatorial stations along the western and eastern African sectors


The paper describes the daily variations in the Sq and sfe induced ionospheric current at the equatorial stations of Addis-Ababa (Inclination: 1.0°; Declination: 1.5°) and M’Bour (Inclination: 9.0°; Declination: −9.3°). At Addis-Ababa, the diurnal SqH loop as well as sfe H currents aligned fairly well with the direction of declination. At M’Bour, the SqH as well as the sfe H vector were along the direction of about 30°W. Thus, in the region of an abnormally large declination at equatorial stations, the daily Sq current does not follow a direction normal to the declination.


  • Kane, R. P. and N. B. Trivedi, Comparison of equatorial electrojet characteristics at Huancayo and Eusebio (Fortelaza) in South American region, J. Atmos. Terr. Phys., 44, 785–792, 1982.

    Article  Google Scholar 

  • Kuwashima, M. and T. Uwai, Solar flare effects on magnetic variations, Mem. Kakioka Magn. Observ., 21, 1–14, 1985.

    Google Scholar 

  • McNish, A. G., Terrestrial magnetic variations and ionosphere, Terr. Magn., 42, 109–122, 1937.

    Article  Google Scholar 

  • Rastogi, R. G. and R. J. Stening, On the eastward geomagnetic field variations of electrojet stations, Indian J. Rad. Space Phys., 31, 67–74, 2002.

    Google Scholar 

  • Rastogi, R. G., D. R. K. Rao, S. Alex, M. Pathan, and T. S. Sastry, An intense SFE and SSC in geomagnetic H, Y and Z fields at the Indian observatories, Ann. Geophys., 15, 1301–1308, 1997.

    Article  Google Scholar 

  • Rastogi, R. G., H. Chandra, and R. K. Misra, Features of the ionospheric drift over the magnetic equator, Space Res., 12, 982–992, 1972.

    Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to R. G. Rastogi.

Rights and permissions

Open Access  This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

To view a copy of this licence, visit

Reprints and permissions

About this article

Cite this article

Rastogi, R.G. Sq and sfe currents at equatorial stations along the western and eastern African sectors. Earth Planet Sp 58, 1475–1478 (2006).

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI:

Key words