"Dave" wrote
...
On Oct 24, 5:12 pm, "Szczepan Bialek" wrote:

Lightnings produce LW.

yes, there are downward leaders. these can be tracked either by their
radio noise or by radar. the size and step process has been well
known for many years.

The oscilations start from very short in all directions and the last
steps
are longest.
there are no oscillation in the step process. and there is no

evidence that the steps change length in any report i have seen.

But it is obvious. Each spark is in form of oscillations. No matter if
the
"electrods" are steady or the distance is increasing.
It was discovered by observing the tissue punched by the spark (XIX
century).
In nowadays reports no obvious thinks.
S*

it may be obvious to you, but that doesn't make it true. a spark is
not a form of oscillation. and leaders are not sparks. sparks are a
very specific phenomenon that is a very short lived breakdown over a
short distance. leaders and streamers are long term conductive
channels caused by a channel of charge accumulated in them and are
progressive breakdowns over long distances. The physics are very
different, but in neither are there oscillations. again you go back
to ancient history, it is time you updated your reading list.

All breakdown are made by oscillating electrons. They work like the
pneumatic hammer. When electron oscillate (like in the Kundt's tube) at the
end the voltage is doubled and the next distance is progressed.

" Lightnings produce LW.

yes, there are downward leaders. these can be tracked either by their
radio noise or by radar. the size and step process has been well
known for many years"

In ECM such initial oscillations are detected and the power is shut down
before full breakdown.
The electrons have mass and charge - they like oscyllate. They oscillate
before the full breakdown and after to dissipate the full energy. In the
channel are better conditions to oscillations than in the conductor.
S*