From: Estimating the solar wind conditions during an extreme geomagnetic storm: a case study of the event that occurred on March 13–14, 1989
Day
Start
X-ray
V sh (second SSC) (km/s)
V max (second SSC) (km/s)
Cliver et al. 1990
Belov et al. 2008
10
1848E
X4.5
680
490
547–600
11
0829E
M9.7
880
640
645–710
1535E
X1.2
1040
760
724–798
1933E
X1.3
1150
850
778–859
12
0016E
M7.3
1320
980
906–952