What phenomenon occurs when lightning travels down a stem and jumps to another conductor?

When lightning travels down a stem and then jumps to another conductor, this is referred to as a side flash. This phenomenon occurs when a portion of the lightning current deflects from its original path, often due to a nearby object or conductor that creates a voltage difference. The side flash can be particularly hazardous because it may affect objects that are not directly struck by the lightning bolt, allowing energy to transfer across distances.

In the context of tree support and lightning protection, understanding side flashes is crucial as they can lead to damage to structures, trees, and electrical systems nearby, even when these are not in the direct line of the lightning strike. Recognizing the risks associated with side flashes can help in formulating effective strategies for lightning protection and tree care, ensuring enhanced safety and minimizing damage.