One day of the Sun.
The star that powers every grid on this site can also switch them off, and the United States keeps live instruments pointed at it around the clock. This page reads them the moment you open it: the X-ray flux from the GOES satellites, the planet's geomagnetic pulse, and NOAA's own storm scales — plus the long book: every monthly sunspot count since 1749, twenty-five solar cycles on one line, with the current cycle drawn against all of them. Nothing on this page is stored — close it and open it again, and the Sun will have moved.
published 2026-08-29 · a LIVE instrument — every figure fetched from NOAA SWPC at the moment you load the page · edition 1 governs the page, never the readings · source: NOAA Space Weather Prediction Center
The Sun, as of this page load.
Four live readings. The flare class is the X-ray flux right now — A and B are quiet, C murmurs, M disturbs radio, X ends conversations. Kp is Earth's magnetic answer — past 5 is a storm, past 7 the aurora goes continental. The R/S/G scales are NOAA's own severity ladder, quoted verbatim. Beneath them, the last seven days of flares, drawn as they came down.
Two hundred and seventy-seven years of weather on a star.
The monthly sunspot number since 1749 — humanity's longest continuous scientific measurement — rising and falling on the Sun's own eleven-year heartbeat. Twenty-five cycles, from the towering 19th of the 1950s to the strange quiet of the 2010s, with the cycle now under way drawn hot at the end of the line.
A page that stores nothing.
Four live feeds, no copies. The flare class and seven-day timeline come from the GOES primary X-ray feed; the geomagnetic pulse from the planetary K-index; the R/S/G severities from NOAA's scales product; the cycle from SWPC's observed solar-cycle indices. All are public, keyless JSON from services.swpc.noaa.gov, read at the moment the page loads. This page holds no snapshot — its records ARE NOAA's, and its dateline governs the page's words, never its readings.
What is quoted and what is refused. Severity language (R, S, G scales) is NOAA's verbatim ladder. This page draws no forecast of its own — where NOAA states a probability, it can be quoted as NOAA's; nothing here extrapolates a flare or a storm. A feed that fails to answer leaves an honest empty cell that says which feed and when.
Why it is on this site. A G-class storm is grid weather in the most literal sense this site has: transformers, GPS, aviation and the aurora all answer to it. The star is part of the grid, so the grid intelligence house keeps an instrument on it.