Data and Tools
Open data and software, built for reuse
Long-baseline solar datasets, the code that makes them, and notebooks to get started. Please cite the DOI when you use them.
The 265-year daily magnetic maps from our historical AFT reconstruction are described in Jha et al. (2026, ApJ).
The sunspot record, 1749 to today
Hover or tap to read any month. Data: SILSO international sunspot number via NOAA SWPC, loaded live, with SWPC's forecast for the rest of Cycle 25.
Coming next
Interactive butterfly diagram
Sunspot and plage latitudes over a century, from the Kodaikanal archive, zoomable by cycle.
Coming next
Synoptic map evolution
Flux transport runs as movies: watch the polar field reverse.