☀️
Niche Astronomical Data
Solar Activity Checker
Latest sunspot number and F10.7 solar radio flux.
Try the tool
Tool principle
Sunspot number (SSN) counts groups and individual spots; F10.7 flux measures 10.7 cm solar radio emission — both track the ~11-year solar cycle.
Data source: NOAA Space Weather Prediction Center public JSON feed.
User guide
- 1Click Refresh to fetch the latest monthly index.
- 2Higher SSN means higher flare and aurora probability.
Frequently asked questions
Where can I see aurora forecasts?＋
NOAA SWPC also publishes 30-minute Kp indices and the OVATION auroral oval map.