Star weather on 28 September 2026: a quiet Sun, a Libra Sun under tension

The Sun, measured The Sun is quiet today: the X-ray flux stands at B2.8, and the strongest flare of the past hours reached B6.7 – both in the low, unremarkable range. The F10.7 radio flux is at 97 sfu and the sunspot number for August at 76, well below this cycle’s previous maximum of 216. The solar wind flows at around 343 km/s, comparatively leisurely, and the Earth’s magnetic field