Marshall, Ivan, Roger, Bob, Mike, et al--

Excuse my tardiness in APOLOGING for misinformation about CS polarity,
and THANKING YOU for the tutelage.

Urgent electrical question:  In a SPARK GAP, a HV pulse initiatates a
plasma arc, which can then conduct current.  The min. V required for
*striking* the arc depends on the gas, pressure, and electrode distance. 
What determines the min. V for *maintaining* the arc?  Does it vary
inversely with amperage?  

Thanks for any assistance!  --Russ


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