A Comparative Study on the Positive Lightning Return Stroke Electric Fields in Different Meteorological Conditions

Table 4

Statistics for (a) slow front duration, (b) slow front amplitude relative to peak, and (c) fast transition rise time (10–90%).

(a)

	First return stroke	Subsequent return strokes	All
AM, s	19.1	21.1	19.1
SD, s	26.2	24.9	25.7
GM, s	9.8	12.5	9.8
Min, s	0.5	1.6	0.5
Max, s	131.4	83.5	131.4
Sample size,	39	9	48

(b)

	First return stroke	Subsequent return strokes	All
AM, %	44.5	43.2	44.3
SD, %	13.7	20.6	15
GM, %	42.2	39.3	41.7
Min, %	17.6	26	17.6
Max, %	73.9	76.8	76.8
Sample size,	39	9	48

(c)

	First return stroke	Subsequent return strokes	All
AM, s	2.5	3	2.6
SD, s	4.7	1.7	4.3
GM, s	1.4	2.5	1.6
Min, s	0.3	1.1	0.3
Max, s	28.9	6.2	28.9
Sample size,	39	9	48