The model describes the diurnal and seasonal variation of the F-region electric-field-induced plasma drift as measured by the St. Santin (44 N, 2 E) incoherent scatter radar. It was established on the basis of three years (1973-1975) of measurements during magnetically quiet periods. The ion velocity perpendicular to the geomagnetic field is represented by a simple harmonic function in local time with nine coefficients per season.
M. Blanc and P. Amayenc, Seasonal Variations of the Ionospheric ExB Drifts Above Saint Santin on Quiet Days, J. Geophys. Res. 84, 2691, 1979.
NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility