|Flash||All current discharges and electrical impulses from a lightning event.||Generic Terms.
A Flash can occur within clouds (CC) or between a cloud and the ground (CG)
A Flash can be composed of one or many Strokes.
A Flash combines current discharges that are detected in LF and electrical breakdowns that are detected in VHF
|Stroke or return stroke||Electrical discharge in a lightning flash to earth|
|First stroke||First stroke of a cloud to ground flash|
|Subsequent stroke||All the remaining strokes after the 1st one (the 2nd, 3rd, …) in a cloud to ground flash|
|Flash||A shortcut to define a flash by its first stroke.||The first stroke is used to represent a group of strokes|
|Intra-cloud||Discharge of intra-cloud current||Between two clouds (CC) or within the same cloud (IC)|
|VHF lightning||Set of electrical bursts in an event||
|Source (or burst or breakdown)||Emission of an electrical burst||Only detectable in VHF|
|Branch (or ramification)||Grouping of the sources belonging to one flash, used to draw their development in space and time||Group of VHF sources represented in the form of branches|
|Represented by a polygon or an ellipsis|
|Source density||Number of sources as computed on a grid for a given time period||Represented by a grid or a surface|