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

Table 8

Comparative values of key parameters in per unit (values measured in Malaysia are made as bases).

Parameters	Tropic	Subtropic	Temperate
			Sweden		Japan
	Malaysia (48 samples)	Florida (62 samples)	Number of Samples		Number of Samples
Zero-to-peak rise time	1	0.3	64	0.6	(Summer 32)	0.6
10–90% rise time	1	0.4	15	0.7	(Summer 32)	0.7
Slow front duration	1	0.3	63	0.4	(Summer 32)	0.7
Slow front amplitude relative to peak	1	0.9	63	1.4	—	—
Fast transition rise time (10–90%)	1	0.4	63	0.1	(Overall 24)	0.04
Zero-crossing time	1	0.9	—	—	(Summer 34)	2.6
Opposite polarity overshoot relative to peak	1	0.3	—	—	(Summer 34)	0.5