• The area near the ground also has positive
charge.
• The field strength required trigger lightning de-
pendent the insulation ability the air and is
between 0.1.Charge distribution cloud
1.
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12
Chapter General introduction
.1.
Typical charge distribution:
• Positive the upper part, negative the middle
part, and weakly positive the lower part.3 Charge dispersion
Studies have proved that the sleet falling down (area
warmer than –15 °C) has negative charge and the
ice crystals being thrown upwards (area colder than
–15 °C) have positive charge. The light ice crystals
are carried into the upper areas the cloud the
up-wind and the sleet falls the central areas the
cloud.5 and kV/m
