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At 02:23 AM 2/18/01 -0800, Bernard G. Cleyet was skeptical of my guestimate
of the breakdown field:
It's about 3 megavolts per meter. You can guestimate this answer based on
the previously-described model: an ion needs to pick up enough energy
between collisions to have a fair chance of ionizing whatever it
hits. That requires a field strength on the order of a fraction of a volt
per mean-free-path.