Solar flux 156 and estimated planetary A-index 14. The estimated planetary K-index at 1500 UTC on 27 April was

Forecast Issued at 2200Z on 26 Apr 2026

Solar Activity Forecast: Solar activity is likely to be moderate with a slight chance for an X-class flare on days one, two, and three (27 Apr, 28 Apr, 29 Apr).

Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (27 Apr), quiet levels on day two (28 Apr) and quiet to unsettled levels on day three (29 Apr). Protons have a slight chance of crossing threshold on days one, two, and three (27 Apr, 28 Apr, 29 Apr).