w_tom wrote:

The term DC pulses is an oxymoron.

Isn't DC electrical current that flows in only one direction? In 1883,
when a telegraph operator hooked up a battery and started pressing his
key, wasn't he generating DC pulses? (There may have been a little AC
activity each time the key broke contact.)

At any rate, perspective of this discussion is Lightning
protection. (Although it originally was about a faraday cage
provided by a chain link cage), it has morphed into the AC
nature of lightning; the component that makes lightning so
challenging and destructive. So challenging that some call
lightning capricious. The AC component in lightning that make
protection difficult is not intuitively obvious. The
components that tend to be most challenging are in the
kilohertz and megahertz range. IOW the DC component is rarely
considered in the overall design of lightning protection.
Higher frequency components are discussed as if higher
frequencies are the only part that exists.

I don't know if they were familiar with AC when they defined the Henry.
Across one Henry of inductance, it takes one Volt to increase the
electrical flow by one Ampere per second.

Suppose a grounded terminal gets hit by a 1000-Volt pulse lasting .001
second. Suppose the grounding rod has 20 ohms to ground, and there's a
1 Henry choke between the terminal and the rod.

The thousand Volts will increase the current through the inductor at
1000 Amperes per second. At the end of 1 millisecond, current will have
increased to one Amp. In view of the resistance at the ground rod,
voltage will have increased to 20 Volts.

Things will be entirely different on the hot side of the choke. What
appears to be a short for unvarying DC will appear to be an open for a
quick, low-impedance pulse. Who needs AC theory for that?