Skip to main content

Equatorial electrojet in the East Brazil anomaly region

An Erratum to this article was published on 25 June 2014


An examination of the geomagnetic field variations at equatorial stations in South America has shown that the daily range of the northward field, H, is about 30% larger in Peru than in Brazil. The midday H field vector in Brazil shows a large westward tilt, corresponding to large westward declination at the station. A significant meridional trans-equatorial current system is suggested for the observed anomaly. The longitudinal variation in the equatorial electrojet current strength is suggested to be due to the corresponding variation in the ionospheric electric field rather than to the electrical conductivity.


  • Appleton, E. V., Two anomalies in the ionosphere, Nature, 157, 691, 1946.

    Article  Google Scholar 

  • Baker W. G. and D. F. Martyn, Electric currents in the ionosphere, Philos. Trans. Roy. Soc. London, Ser. A. 246, 281–294, 1953.

    Article  Google Scholar 

  • Chapman, S., The equatorial electrojet as detected from the abnormal electric current distribution above Huancayo, Peru and elsewhere, Arch. Meterol. Geophys. Bioklimatol., A4, 368–390, 1951.

    Article  Google Scholar 

  • Cowling, T. G. and R. Borger, Electrical conductivity of the ionospheric D region, Nature, 162, 143, 1948.

    Article  Google Scholar 

  • Rastogi, R. G., The diurnal development of the anomalous equatorial belt in the F2 region of the ionosphere, J. Geophys. Res., 64, 727–732, 1959.

    Article  Google Scholar 

  • Rastogi, R. G., The morphology of lunar semi-diurnal variation in foF2 near solar noon, J. Atmos. Terr. Phys., 22, 290–297, 1961.

    Article  Google Scholar 

  • Rastogi, R. G., Enhancement of the lunar tide in the noon critical frequency of the F2 layer over the magnetic equator, J. Res. (NBS), 66D, 601–606, 1962a.

    Google Scholar 

  • Rastogi, R. G., Longitudinal variation in the equatorial electrojet, J. Atmos. Terres. Phys., 24, 1031–1040, 1962b.

    Article  Google Scholar 

  • Rastogi R. G., Geomagnetic field variations at low latitudes and ionospheric electric fields, J. Atmos. Terres. Phys., 55, 1375–1381, 1993.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to R. G. Rastogi.

Additional information

An erratum to this article is available at

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., Yumoto, K. Equatorial electrojet in the East Brazil anomaly region. Earth Planet Sp 59, 103–106 (2007).

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI:

Key words

  • Equatorial electrojet currents
  • longitudinal variation
  • meridional equatorial ionospheric current