Elevated solar wind speeds of 420 to 430 km/s were measured by the WIND satellite. During the time of the event, the component of the IMF changed from a negative to positive from value while remained positive and small. No data was recorded from IMP8. The index at the time of the event was 1.0.
The overview map in Figure 5.46 shows extended backscatter and some double-peaked spectra scattered at low and high latitudes. There appear to be two bands of double-peaked spectra. An area of missing backscatter is centered around E and N.
Figure 5.46: Map of spectral findings from the Saskatoon and Kapuskasing radars: 18 Feb/95
Figure 5.47 shows a flight path that takes the satellite through the region of missing scatter to . At the satellite is located at N latitude where the Saskatoon radar observed double-peaked spectra along 3 beams.
Figure 5.47: Peak-map with overlaid flight path of the DMSP F12 satellite: 18 Feb/95
The energy and flux data presented in Figure 5.48 show a low flux after and only three low energy precipitation events at , 5135 s and . The low energy precipitation apparently produces no corresponding double-peaked spectra observations from the radar.
Figure 5.48: Average electron energy and flux determined from SSJ/4 instrument measurements: 18 Feb/95
The ionization rates in Figure 5.49 reflect the low energy precipitation events and also show some ionization at F-layer heights at when the satellite is about at N latitude. The E-layer is quiet, which can also be seen from the low conductivities in Figure 5.50.
Figure 5.49: Estimated ionization rates at E- and F-layer heights determined from electron spectra measurements: 18 Feb/95
Figure 5.50: Estimated E-layer conductivities from the Robinson model: 18 Feb/95
The velocity map in Figure 5.51 shows only a small patch of flow vectors. This is due to the fact that there was a significant amount of groundscatter, and the processing of radar data into ionospheric velocity maps involves removing groundscatter points.
Figure 5.51: SuperDARN velocity map: 18 Feb/95