Research Article

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

Table 7

Statistics of different parameters of positive return stroke electric fields obtained in different studies.

Sample size, AMSDGM

Zero-to-peak rise time, s
Rust et al. (1981) [36]156.9
Cooray and Lundquist (1982) [2]64134
52123
Ishii and Hojo (1989) [40]3213.23.6
12321.25.8
Cooray (1986) [39]208.91.7
Nag and Rakov (2014) [9] (overall)627.83.86.9
45 (summer)7.56.8
17 (winter)8.57.4
This study4822.428.112.9

10–90% rise time, s
Beasley et al. (1983) [37]62.7
Hojo et al. (1985) [38]32 (winter)8.7
44 (summer)6.7
Cooray (1986) [39]156.21.4
Nag and Rakov (2014) [9] (overall)6242.13.4
45 (summer)4.13.5
17 (cold)3.83.1
This study489.413.25.1

Slow front duration, s
Cooray and Lundquist (1982) [2]631011
Cooray (1986) [39]208.21.7
Ishii and Hojo (1989) [40]19.3
Cooray et al. (2004) [25]638.32.6
Nag and Rakov (2014) [9] (overall)625.93.65
This study4819.125.79.8

Slow front amplitude relative to peak, %
Cooray and Lundquist (1982) [2]673811
314414
Cooray (1986) [39]20457
Cooray et al. (2004) [25]63610.7
Nag and Rakov (2014) [9] (overall)62391537
This study4844.31541.7

Fast transition rise time (10–90%), s
Cooray (1986) [39]200.560.7
Ishii and Hojo (1989) [40]240.110.62
Cooray et al. (2004) [25]630.260.11
Nag and Rakov (2014) [9] (overall)621.20.771
This study482.64.31.6

Zero-crossing time, s
Ishii and Hojo (1989) [40]34151
8993
Nag and Rakov (2014) [9] (overall)42 (winter)699245
10 (summer)53
This study4857.8140.323.4

Opposite polarity overshoot relative to peak, %
Ishii and Hojo (1989) [40]34 (summer)24
89 (winter)40
Nag and Rakov (2014) [9]33159.313
This study4144.827.235.3