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  • Letter
  • Open Access

Day-to-day variability of the equatorial electrojet current in the South American sector

Earth, Planets and Space200759:BF03352707

  • Received: 13 October 2006
  • Accepted: 3 February 2007
  • Published:


A comparison of the geomagnetic H field data at Ancon, Peru and Buriticupa, Brazil for the period December 1990 and January 1991 revealed the presence of a significant correlation in day-to-day variability in the solar daily variation of H at the two stations, which are separated by about 2000 km. It is suggested that the day-to-day variability in the time as well as in the magnitude of the daily peak of the H field at an equatorial electrojet station is due to the superimposition of a semi-diurnal wave of the electric field over the normal mean daily variation.

Key words

  • Equatorial electrojet
  • day-to-day variability
  • equatorial electric field