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NOAA SWPC
learn more about R/S/G scales
Latest observed
R
– Radio Blackouts
—
S
– Solar Radiation Storms
—
G
– Geomagnetic Storms
—
24-hour observed maximums
R
(24h Max)
—
S
(24h Max)
—
G
(24h Max)
—
1-day forecast
R
– Minor (R1) Prob.
—%
Chance of R1 radio blackout
R
– Major (R2+) Prob.
—%
Chance of R2 or greater
S
– Storm Prob.
—%
Probability of solar radiation storm
G
– Qualitative Forecast
—