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