A quick-look HF propagation compass. SFI and Sunspots lift the ionosphere. K and A describe geomagnetic disturbance.

What to do now?

• High SFI + low K/A — try higher bands: 20 → 15 → 10 m
• Rising K/A — go lower: 40/60/80 m or digital modes
• MUF near band edge — timing matters, check hourly

Reading the KPIs

• SFI / SSN — higher = more ionisation, better high bands
• K / A — higher = more disturbance. K ≥ 4 means rough going
• Solar Wind — sustained fast wind raises K/A potential
• foF2 — F-layer vertical ceiling, strong day/night variation
• MUF — highest usable freq for ~3000 km. MUF ≈ 3 × foF2

Colour code

Source: hamqsl.com (stored locally). foF2/MUF estimated from SFI if not in feed.