The model describes the ion velocity at about 300 km altitude between -65 and +65 magnetic altitude. It is based on incoherent scatter radar (ISR) data from Millstone Hill (5/76-11/77), St. Santin (2/73-12/75), Arecibo (8/74-5/77), and Jicamarca (1/74-10/77). Only data for magnetically quiet periods are selected. They are averaged at each half hour for three seasons (November-February; May-August; March, April, September, October). For given magnetic latitude, longitude, universal time, and day number of the year the subroutine provides the drift velocity component perpendicular to the geomagnetic field and an electrostatic pseudo- potential, which can be used to obtain the ionospheric electric field.
Availability: Retrievable from CCMC's anonymous FTP site.
A. D. Richmond, M. Blanc, B. A. Emery, R. H. Wand, B. G. Fejer, R. F. Woodman, S. Ganguly, P. Amayenc, R. A. Behnke, C. Calderon, and J. V. Evans, An Empirical Model of Quiet-Day Ionospheric Electric Fields at Middle and Low Latitudes, J. Geophys. Res. 85, 4658, 1980.