Dave wrote:
However, the electric field that must accompany them is what
generates the corona effects that can be heard.

Wouldn't the whole sky glow at night like the
Northern Lights if the entire dust cloud was
ionizing the air to the corona threshold?

The fair weather current doesn't meet the
corona threshold so how could corona occur
with a rounded full-wave loop under fair
weather conditions?
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73, Cecil http://www.w5dxp.com