Abstract
Abstract 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.
Highlights
The large solar daily range of the horizontal component of the geomagnetic field, H, at stations close to the dip equator have assumed great importance due to its close association with solar weather conditions. Baker and Martyn (1953) showed that the orthogonality of the electric and magnetic field over the dip equator generates large eastward conductivities during the daytime causing the flow of the equatorial electrojet (EEJ) with the normal Sq electric field.The day-to-day variability of the time and intensity of EEJ at any station has been a puzzling problem, the solution of which is still not clear
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
Summary
The large solar daily range of the horizontal component of the geomagnetic field, H, at stations close to the dip equator have assumed great importance due to its close association with solar weather conditions. Baker and Martyn (1953) showed that the orthogonality of the electric and magnetic field over the dip equator generates large eastward conductivities during the daytime causing the flow of the equatorial electrojet (EEJ) with the normal Sq electric field.The day-to-day variability of the time and intensity of EEJ at any station has been a puzzling problem, the solution of which is still not clear. 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.
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