Compiled by G0KYA, G3YLA and G4BAO on 20 August, 2026 Last week was characterised by geomagnetic disturbances, due to high-speed solar wind streams from coronal holes and a slightly increasing solar flux index. The Kp index hit 5 on 18-19 August reducing maximum useable frequencies, or MUFs, and generally being detrimental to HF propagation. We also […]

Compiled by G0KYA, G3YLA and G4BAO on 13 August, 2026 The 2026 solar eclipse is done and dusted, so we can get back to normal HF propagation predictions. The Solar Flux Index dropped below 100 this week, which is more symbolic than anything. But it shows where we are heading as Solar Cycle 25 drops […]

Compiled by G0KYA, G3YLA and G4BAO on 6 August 2026. The Sun was mostly settled last week with very little to report. The solar flux index declined to 108 by Thursday, 6 August, with most of the sunspot activity being on one half of the solar surface. Geomagnetic conditions have also been settled with a Kp […]

Compiled by G0KYA, G3YLA and G4BAO on 30 July, 2026 We’ve had quite a reasonable period of HF propagation over the past seven days. The solar flux index remained quite high and conditions have been quite stable, apart from a geomagnetic disturbance on Thursda, 23 July that saw the Kp index rise to 5.33. The […]