Ran across another interesting paper:
http://www.lightningsafety.com/nlsi_lhm/Radials.pdf, a paper by Moore, et al,
from the Langmuir Lab.
Their recommendation is that radials for lightning dissipation should extend
8-10 meters from the down conductor. (based on height of stepped leader and the
surface charge distribution)
They also point out that a standard rod has sufficient inductance (2.4 uH,
est) that it's not a particularly good lightning current sink, because it would
still result in a radial electric field of several hundred kV/m. That field
would result in radial streamers forming and propagating outward.
The concern overall is that of "surface arcing"
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