Space weather conditions next 24 hours
Alan Zaur
HF Communications Outlook — Next 24 Hours
For the next 24 hours, HF propagation is expected to remain normal with no major disturbances, though C-class solar flares are possible and geomagnetic conditions are quiet.
Current Space Weather
Sunspot Number: 106 (as of 23 Jun 2026) HF Radio World-Wide
Solar X-ray Flux: ~130 sfu HF Radio World-Wide
Planetary A-index: 7 (quiet to normal) HF Radio World-Wide
Kp index: ~2.33 (quiet) HF Radio World-Wide
Solar Wind: ~444 km/s, ~14 protons/cm³, Bz near 0 nT HF Radio World-Wide
Recent Flares: C8.7 at 2318Z 23 Jun 2026, with another C8.7 expected within 24 hours HF Radio World-Wide
Forecast for Next 24 Hours
Solar Flares: C-class flares (≥50% probability) HF Radio World-Wide
Geomagnetic Activity: Quiet (A < 20, K < 4) HF Radio World-Wide
Solar Proton Events: No current or predicted events HF Radio World-Wide
NOAA Radio Communications Forecast:
R1–R2 (Minor–Moderate): ~50% probability
R3–R5 (Severe): ~10% probability
- S1+ (Storm): <5% probability NOAA / NWS Space Weather Prediction Center
HF Propagation Conditions
Global Outlook: Normal at all latitudes (high, middle, low) HF Radio World-Wide
10.7 cm Flux: ~128 sfu (normal) HF Radio World-Wide
D-Region Absorption: No predicted significant absorption NOAA / NWS Space Weather Prediction Center
Auroral Activity: No current auroral storms; quiet conditions expected HF Radio World-Wide
Practical Implications
Long-distance HF contacts should be possible on most bands, with normal MUF and LUF conditions.
C-class flares may cause brief, localized HF degradation on the sunlit side of the ionosphere, but no major blackouts are expected NOAA / NWS Space Weather Prediction Center.
Navigation signals (e.g., LORAN, HF-based) may experience occasional brief degradation NOAA / NWS Space Weather Prediction Center.
Best times for DX are likely during daylight hours when solar flares are less disruptive.
Summary: Expect stable HF conditions with only minor flare-related effects. Plan for normal propagation, but be aware of possible short-term degradation during flare activity.