livefree+
Solar cycle
The rise and fall of the Sun's activity over time.
Metrics
Sunspot number
live freeLatest monthly international sunspot number; add ?series=true for the full multi-century history (always spans the whole window — downsampled evenly to the `limit` point cap when longer, per meta.hint).
Pull Solar cycle data
Each metric above lists its endpoint. Requires thefree plan or higher. Get a key and start pulling live, fully sourced responses.