Table 4-2. Flashes recorded by the MSE network in 2002.
Flash ID Type Date Time (UT)
MSE-0201
MSE-0202
MSE-0203
MSE-0204
MSE-0205
MSE-0206
MSE-0207
MSE-0208
MSE-0209
MSE-0210
MSE-0211
FPL-0205
FPL-0208
FPL-0213
FPL-0219
FPL-0221
FPL-0228
FPL-0246
Natural Negative CG
Natural Positive CG
Natural Negative CG
Natural Negative CG
Natural Negative CG
Natural Negative CG
Natural Negative CG
Natural Negative CG
Natural Negative CG
Natural Negative CG
Natural Negative CG
Altitude Trigger
Classical Trigger
Classical Trigger
Classical Trigger
Classical Trigger
Classical Trigger
Classical Trigger
7/20/2002
8/4/2002
8/30/2002
8/30/2002
8/30/2002
9/15/2002
9/15/2002
9/15/2002
11/10/2002
11/10/2002
12/24/2002
7/9/2002
7/9/2002
7/19/2002
7/20/2002
7/20/2002
8/2/2002
9/13/2002
probability that the actual strike point was within the ellipse. Each ellipse can be
uniquely defined by the length of its semi-major axis, its eccentricity (the ratio of
semi-major axis length to semi-minor axis length), and the angle of the semi-major
axis with respect to true north. For example, the 50% probability ellipse for the NLDN
calculated location for the first stroke of flash MSE-0204 has a semi-major axis length
of 400 m and an eccentricity of one. Hence, the 50% confidence ellipse for the first
stroke of flash MSE-0204 is a circle of radius 400 m. A circular confidence ellipse
having a relatively low (< 1 km) semi-major axis length implies that the stroke was
detected by multiple NLDN sensors at various angles. A very eccentric ellipse, having
a large semi-major axis, implies that the stroke was only detected by two sensors with
the major axis of the ellipse being oriented on a line between the two sensors. Ellipses
for any arbitrary confidence level can be calculated by scaling the semi-major axis and
semi-minor axis appropriately. The 95% ellipses (95% probability of the strike point
being inside of the ellipse) are about twice the size of the 50% ellipses. Video records
(19:39:30.712)
(20:05:28.990)
18:00:44.072
18:01:37.993
18:13:55.827
20:40:59.256
20:41:30.727
21:18:14.425
(14:29:05.611)
(14:31:42.561)
18:49:58.600
16:26:10.767
16:35:05.073
21:58:05.813
20:26:32.545
20:51:42.721
00:20:15.862
19:18:14.084