1. The light ice crystals
are carried into the upper areas the cloud the
up-wind and the sleet falls the central areas the
cloud.1.
• The field strength required trigger lightning de-
pendent the insulation ability the air and is
between 0.
Typical charge distribution:
• Positive the upper part, negative the middle
part, and weakly positive the lower part.Charge distribution cloud
1.3 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.
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12
Chapter General introduction
.
• The area near the ground also has positive
charge.5 and kV/m
