Tukuk-OSSpace Weather
What the Sun is doing this week · NOAA GOES live data
Space weather is what the Sun does to our technology. Solar flares arrive at the speed of light (8 minutes), radiation storms within hours to days, and coronal mass ejections — the drivers of aurora and geomagnetic storms — in one to three days. Numbers below come from NOAA’s GOES X-ray sensor and the F10.7 radio flux index, the two classic live measures of solar activity.
Flares (7 days)
Avg F10.7 flux
Flux range
30-day trend
Reporting window
Source
Strongest flare this week: C3.5
Peak 2026-10-22T03:09:00Z. An X-class flare can trigger radio blackouts on the daylight side of Earth within 8 minutes; M-class events give brief polar fadeouts; C-class are routine.
Flare strength by class
Day by day
| Date (UTC) | Flares | Strongest class |
|---|---|---|
| 2026-10-23 | 11 | C1.3 |
| 2026-10-24 | 3 | C1.0 |
| 2026-10-25 | 5 | C1.5 |
| 2026-10-26 | 17 | C1.5 |
| 2026-10-27 | 5 | C1.1 |
| 2026-10-28 | 9 | C1.0 |
| 2026-10-29 | 0 | — |
Radio flux, week by week
Will there be aurora, and can you see it from Malaysia?
Aurora needs a geomagnetic storm (Kp ≥ 5) plus a dark, clear sky near a magnetic pole — so from the tropics the answer is normally no, though exceptionally strong storms have produced equatorial sightings. What space weather does reach here with force: HF radio skip quality, GPS accuracy, and satellite drag. If you plan radio or GNSS work during a storm, NOAA’s 3-day forecast is the operational reference.
Reading the numbers
F10.7 flux (solar flux units, sfu) tracks the Sun’s microwave output and rises with sunspot area: ~70 sfu at deep minimum, 200+ at cycle peak. X-class flares are numbered by their X-ray peak in watts per square metre at Earth — X1, X2, X10 (the 2003 Halloween storm was X28, the strongest ever measured).