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

Table 1

The statistical summary of the electric field parameters produced by positive lightning first and subsequent strokes as recorded at UTM observatory building.

Parameters	Sample size,	AM	SD	GM	Min	Max
Zero-to-peak, s	48	22.4	28.1	12.9	1.5	136.9
10–90% rise time, s	48	9.4	13.2	5.1	0.7	82.6
Slow front duration, s	48	19.1	25.7	9.8	0.5	131.4
Slow front amplitude relative to peak, %	48	44.3	15	41.7	17.6	76.8
Fast transition 10–90% rise time, s	48	2.6	4.3	1.6	0.3	28.9
Zero-crossing time, s	48	57.8	140.3	23.4	2.6	834.6
Opposite polarity overshoot relative to peak, %	41	44.8	27.2	35.3	3	104.9