Hi all. I'm a techy type of guy and I'm trying to figure out how to calculate the KP Index. I can get the current K readings and know how to convert them with the A index, but how do I end up with the Kp index? For example, the Kp index for today is supposed to be a 4. Here are the planetary K-indexes. 2 2 2 1 2 2-1-1 According to the NOAA, the A index is 4.75. Ok. 4.75 isn't that far off from 4. But if I go back historically 2 weeks and use 11/16/2014's data. 4 4 4 3 4 4 3 3 I get a A index of 22.5, but the Kp index for that day was 3. Even the examples at the NOAA don't say how Kp is calculated. Just the K and A. Can anyone offer any insight?