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adamh
Currently, the most effective method of triggering lightning is by launching small rockets (about 1 m tall) that are capable of getting approximately 2 km off the ground, and which trail a thin wire.

Rockets.jpg
Lightning rockets, courtesy Chris Kridler

When the rocket enters a highly charged region within the cloud, the wire provides a nice path to ground, and this is sufficient to initiate the lightning process.

Triggered lightning 1.jpg
Triggered lightning, courtesy University of Florida
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