Positive Lightning?
Positive lightning is when the cloud is positive with respect to
ground, where negative or ordinary lightning has the cloud negative wrt
ground. So in both cases, there are a positive and negative side, and
the charge movement is still in the form of electrons. The streamers
that initiate the strike, which I take it are lines of ionized air
reaching for the opposite polarity, will be negative or positive at
cloud and ground depending on the type of lightning. A positive
streamer probably consists of ionized air that has a deficiency of
electrons, because the electrons were ****ed away by the electric
field. There would have to be positive ions in that streamer, but they
wouldn't move very much, because their mass is thousands of times
greater than that of electrons (1800 for a single proton; so for an
oxygen atom, for example, 30,000 times greater). With an electric
field, and an electron with one negative charge and an atom with one
positive charge that is 30,000 times heavier, the movement will be
similarly divided.
The answer to what is in the positively charge streamer is just
whatever atoms make up air, but ionized by the loss of electrons. But
the positive ions don't move much and the charge transfer is by
electrons.
I googled an interesting article about positive and bipolar lightning:
http://tinyurl.com/nmmcc
--
John
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