Sun · cycles
Solar cycle 25 now
The Sun goes from minimum to maximum activity in about eleven years. The view uses the latest monthly sunspot number published by NOAA SWPC; the predicted maximum comes from the international cycle 25 panel.
Sunspot number (SWPC)
60
F10.7 radio flux
105 sfu
Predicted maximum
92
NOAA SWPC observed solar cycle indices · U.S. Government work, public domain · 10/23/26
Illustrative rendering: number of groups ≈ sunspot number ÷ 14, positions drawn at random in the activity belts.
Latest month (sunspot number)
60.3
2026-09
NOAA SWPC observed solar cycle indices · U.S. Government work, public domain · 10/23/26
Latest month (F10.7)
105.4 sfu
2026-09
NOAA SWPC observed solar cycle indices · U.S. Government work, public domain · 10/23/26
Latest day F10.7 (OMNI2)
125.0 sfu
2026-10-15
OMNI2 hourly near-Earth solar wind and geomagnetic indices · NASA data, public domain; acknowledge SPDF/OMNIWeb and the index providers · 10/23/26
Predicted maximum (SWPC)
92 ± 10
2026-04
forecast / model extrapolation
NOAA SWPC predicted solar cycle · U.S. Government work, public domain · 10/23/26
Cycle 25 · observed monthly sunspot number and SWPC forecast
NOAA SWPC observed solar cycle indices · U.S. Government work, public domain · 10/23/26
NOAA SWPC predicted solar cycle · U.S. Government work, public domain · 10/23/26
Show the data as a table
Monthly 10.7 cm radio flux and forecast
NOAA SWPC observed solar cycle indices · U.S. Government work, public domain · 10/23/26
NOAA SWPC predicted solar cycle · U.S. Government work, public domain · 10/23/26
Show the data as a table
Daily F10.7 since 1963, monthly mean
OMNI2 hourly near-Earth solar wind and geomagnetic indices · NASA data, public domain; acknowledge SPDF/OMNIWeb and the index providers · 10/23/26
Show the data as a table
Sunspot number since 1749, yearly mean
NOAA SWPC observed solar cycle indices · U.S. Government work, public domain · 10/23/26
Show the data as a table
Method and sources
The monthly sunspot number (SILSO V2.0 redistributed by SWPC) and the 10.7 cm radio flux (sfu, Penticton observatory) are plotted as published. The forecast is the SWPC one (NOAA/NASA/ISES panel): central value and high/low bounds, shown here as ± half range; each import replaces the previous forecast and no predicted point is merged with observations.
The daily F10.7 flux comes from the OMNI2 files (NASA/GSFC, 1963–); monthly and yearly means are computed on the server from the imported points, without smoothing.
Reading these data
A cycle forecast is not a measurement; the SWPC bounds are not statistical confidence intervals. The latest observed months are provisional. The “smoothed sunspot number” used to date maxima is not shown here.
SOURCES OF THIS PAGE
- NOAA SWPC observed solar cycle indices
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NOAA SWPC, Solar Cycle Progression: observed monthly sunspot number (SILSO V2.0) and 10.7 cm radio flux.
· source page ↗
Licence : U.S. Government work, public domain · retrieved on Oct 23, 2026 · SHA-256 0bfebcb61d7a… - OMNI2 hourly near-Earth solar wind and geomagnetic indices
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King, J. H., & Papitashvili, N. E. (2005). Solar wind spatial scales in and comparisons of hourly Wind and ACE plasma and magnetic field data. J. Geophys. Res., 110, A02104. OMNI2 data from NASA/GSFC SPDF OMNIWeb; Kp/ap from GFZ Potsdam, Dst from WDC Kyoto, F10.7 from NRC Canada (Penticton).
· doi:10.1029/2004JA010649 · source page ↗
Licence : NASA data, public domain; acknowledge SPDF/OMNIWeb and the index providers · retrieved on Oct 23, 2026 · SHA-256 6de9b217bd4b… - NOAA SWPC predicted solar cycle
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NOAA SWPC, Solar Cycle Progression: predicted monthly sunspot number and 10.7 cm radio flux with high/low bounds (NOAA/NASA/ISES Solar Cycle Prediction Panel, updated by SWPC).
· source page ↗
Licence : U.S. Government work, public domain · retrieved on Oct 23, 2026 · SHA-256 a2bbb69d58e2…