Solar flux 149 and estimated planetary A-index 3. The estimated planetary K-index at 1200 UTC on 29 April

Forecast Issued at 2200Z on 28 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 (29 Apr, 30 Apr, 01 May).

Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and two (29 Apr, 30 Apr) and quiet to unsettled levels on day three (01 May). Protons have a slight chance of crossing threshold on days one, two, and three (29 Apr, 30 Apr, 01 May).