Here, the lightning begins area negative
charge the cloud and spreads the positively
charged ground.
Annual number lightning strikes per km2
between 1995 and 2003
(www. Lightning involves ex-
change electric charges (electrons gas ions), in
other words, electric currents flow. Depending the
polarity the electrostatic charge, lightning can al-
ternatively start from the ground.gov)
The less common types discharge are:
• Negative ground-to-cloud lightning
• Positive cloud-to-ground lightning
• Positive ground-to-cloud lightning
TBS
Blitzschutz-Leitfaden
2018
/
en
/
2020/01/10
14:42:40
14:42:40
(LLExport_02613)
/
2020/01/10
14:42:54
14:42:54
9
Chapter General introduction
. General introduction
Lightning naturally occurring spark discharge or
short-lived electric arc.
However, the vast majority discharges take place
within clouds, from one cloud another. The local val-
ues obtained NASA can used determine the
annual number lightning strikes per km² even for
countries that not have their own information on
numbers lightning impulses.
NASA has measured the annual global frequency of
lightning over the period 1995 2003.TBS
Blitzschutz-Leitfaden
2018
/
en
/
2020/01/10
14:42:40
14:42:40
(LLExport_02613)
/
2020/01/10
14:42:54
14:42:54
1.nasa. Lightning discharges can take
place from one cloud another, between cloud
and the ground. Lightning one the "electrometeor-
s" generally occurs during thunderstorms, where it
is accompanied thunder.
Some 90% all lightning discharges between cloud
and the ground are negative ground-to-cloud strikes. For risk assessments
according IEC/EN 62305-2, recommended that
these values are doubled
