> Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi All,
>
> This high-speed streak cam photo pretty much sums it all up!
>
> http://drsstc.com/~streakcam/instruments/SET-14/strike.JPG
>
It would be interesting to see if there is some difference in the
propagation of the streamer when the polarity is positive or negative.
In the picture, I would say that the streamer that almost touches
the target is positive, by the appearance of the tip with those
branches. Lightning also shows these branches, but with the
clouds negative and the ground positive, with the branches going
down. Maybe branches appear with any polarity, always pointing
in the direction of the target, where the electric field is smaller.
Antonio Carlos M. de Queiroz