S4 Index

The Index is a standard index used to measure ionospheric disturbances. It is defined as the ratio of the standard deviation of signal intensity to the average signal intensity.[1]

Real Time data

This parameter is displayed in real time by many institutions:

gollark: I am not certain that the error handling is particularly reliable, though.
gollark: It looks that way, anyway.
gollark: Interesting, special-casing for a certain address... I *think* that's just so chervil's shops don't doubletransact...
gollark: Yes, a bit higher.
gollark: Well, these days, you can't be sure ever at all, but I'm ruling out OS-level/hardware/JS interpreter exploits and other silly things.

References
  1. Basu, Santimay; Basu, Sunanda. Scintillation technique for probing Ionospheric irregularities. p. 128.
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