The Force is Strong With This One
The Kp scale/index was new to me and I was trying to figure out what the K was in reference to. As noted above, it is a measurement of how disturbed the Earth's magnetic field is. Consequently, I would think it would have been the Magnetic field - Mf - scale. I still have no clue as to the Kp designation and I'm not finding an explanation so far.
Jeep, I've been following space weather for a long time. This link may be helpful. You can download a PDF as well. (IMO the Suspicious0bservers channel on YouTube is a good place for rational education and exploration of the Electric Universe/Sun topic.)
Here's the link: NOAA Space Weather Scales | NOAA / NWS Space Weather Prediction Center
"The NOAA Space Weather Scales were introduced as a way to communicate to the general public the current and future space weather conditions and their possible effects on people and systems. Many of the SWPC products describe the space environment, but few have described the effects that can be experienced as the result of environmental disturbances. These scales are useful to users of our products and those who are interested in space weather effects. The scales describe the environmental disturbances for three event types: geomagnetic storms, solar radiation storms, and radio blackouts. The scales have numbered levels, analogous to hurricanes, tornadoes, and earthquakes that convey severity. They list possible effects at each level. They also show how often such events happen, and give a measure of the intensity of the physical causes."