© European Geosciences Union 2004

Abstract. We have presented a comparison between the modeled NmF2 and hmF2, and NmF2 and hmF2 which were observed at the equatorial anomaly crest and close to the geomagnetic equator simultaneously by the Akita, Kokubunji, Yamagawa, Okinawa, Manila, Vanimo, and Dar-win ionospheric sounders and by the middle and upper at-mosphere (MU) radar (34.85 ◦ N, 136.10 ◦ E) during the 25– 27 August 1987 geomagnetically storm-time period at low solar activity near 201◦, geomagnetic longitude. A compari-son between the electron and ion temperatures measured by the MU radar and those produced by the model of the iono-sphere and plasmasphere is presented. The corrections of the storm-time zonal electric field, E3, from 16:30 UT to 21:00 UT on 25 August bring the modeled and measured hmF2 into reasonable agreement. In both hemispheres, th