Seasonal and magnetic activity variations of ionospheric electric fields over Millstone Hill

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Annual Variations, Ionospheric Currents, Ionospheric Disturbances, Ionospheric Ion Density, Magnetic Storms, Astronomical Observatories, Conjugate Points, Dynamo Theory, Geomagnetism, Magnetoactivity, Plasmasphere

Scientific paper

Seasonal and magnetic activity variations of the electric fields observed over Millstone Hill (42.6 deg N) in the 19-month period between May 1976 and November 1977 are reported. The ionospheric polarization electric field in the magnetic east and south directions was determined on the basis of monthly incoherent scatter observations of E and F region drifts. Significant day-to-day electric field variations are found which are believed to reflect variations in tidal winds during the day, and possibly other sources at night. Seasonal averages for summer, winter and the equinoxes have been obtained together with annular averages for quiet and disturbed periods, and the averages compared with previous measurements. A significant change in the southward component of the electric field in summer is observed with respect to measurements made from 1968 to 1974 at Millstone, possibly reflecting a sunspot variation. The diurnal north-south variation is observed to be almost exactly opposite at Millstone and St. Santin (44.6 deg N), attributed to the large difference on the latitudes of the conjugate points where dissimilar dynamo fields must be generated.

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