Monthly sunspot number and solar radio flux
Monthly mean sunspot number counted by NOAA's Space Weather Prediction Center and the monthly mean 10.7 cm solar radio flux, the two standard measures of solar activity. One row per month.
Columns
Stable keys — use them in the API, SQL and code
| Key | Name | Type | Description |
|---|---|---|---|
| month | Month | date | Calendar month (YYYY-MM). |
| sunspot_number | Sunspot number | number | Monthly mean SWPC sunspot number, based on daily counts of sunspots and sunspot groups. |
| sunspot_number_smoothed | Sunspot number (smoothed) | number | 13-month smoothed SWPC sunspot number; empty for the most recent months. |
| f107_flux | 10.7 cm flux | number · sfu | Monthly mean solar radio flux at 10.7 cm wavelength (2800 MHz), in solar flux units. |
| f107_flux_smoothed | 10.7 cm flux (smoothed) | number · sfu | 13-month smoothed 10.7 cm solar radio flux; empty for the most recent months. |
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