Boltek Lightning/2000 - Manual (Page 230)

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degrees. The IC stroke lacks the single large pulse of charge
flow that the –CG return stroke has so that the signals from
the +IC strokes are much weaker than –CG strokes, by a
factor that varies from 10 to 100 times smaller.
An additional type of stroke is the positive cloud to ground
discharge (+CG) with two possibilities shown in figure 4.
This stroke originates in the upper layer of positive charge or
the anvil and is usually stronger than the typical –CG stroke,
but not always. This type of stroke occurs less frequently
than the –CG stroke in the typical thunderstorm. A +CG
stroke is usually not followed by additional +CG strokes as is
the case for an initial –CG stroke.