Discussion
The classical charge structure of a thunderstorm is described as
Answer: A
Correct answer: a tripole with positive above, negative in the middle and a lower positive
The classical picture has a main positive charge in the upper cloud, a main negative centre in the middle at around the minus 10 to minus 20 degree level, and a smaller positive pocket near the cloud base. The lower positive charge is small but important, since it helps initiate the negative cloud-to-ground flash by enhancing the field beneath the negative centre. A simple dipole was the earlier and less complete description.
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