Amateur Radio Propagation Report

Sun Images for Past 72 Hours

Images copyrighted by the SDO/NASA and Helioviewer project

📋 Propagation Summary: HF propagation today is shaped by moderate solar activity and very quiet geomagnetic conditions. With a solar flux of 118 and sunspot numbers holding steady in the 80s, expect good performance on 20m and lower bands, while higher bands (12m/10m) remain challenging. The K-index is at 1, indicating stable geomagnetic conditions and minimal disturbances. Operators should focus on the 20m, 40m, and 80m bands for reliable contacts, especially during nighttime and early morning. Keep an eye on grayline opportunities for enhanced DX, and use digital modes for better results on marginal bands.

💡 Operator Tips

• Target 20m and 40m for the best daytime and evening results; these bands are currently the most reliable for both local and DX.
• Try digital modes (FT8, PSK31, RTTY) on 15m, 17m, and even 12m/10m to take advantage of weak openings.
• Nighttime is prime time for 80m and 40m—expect less noise and better long-haul propagation.
• Use low-noise antennas and consider directional arrays to maximize SNR, especially on higher bands.
• Monitor the K-index—if it rises, expect short-term disruptions, especially on polar and east-west paths.
• For contesters and DXers: Focus on grayline periods and sunrise/sunset for best chances at rare DX.

⏰ Best Operating Times

• 80m/40m: Best at night and early morning for both local and DX.
• 20m: Good all day; peaks late morning to late afternoon.
• 17m/15m: Fair during daylight hours, especially late morning and early afternoon.
• 12m/10m: Poor overall, but try midday for possible short openings, especially with digital modes.

🌍 DX Opportunities

• Grayline paths (sunrise/sunset) on 40m and 20m offer enhanced DX to antipodal regions.
• 20m band is open for intercontinental contacts, especially along north-south paths.
• 17m/15m may support occasional DX, particularly to equatorial and southern latitudes during local noon.
• Aurora activity is low—no significant VHF/UHF auroral propagation expected.
• Watch for sporadic-E on 10m as we approach the seasonal peak (late spring).

📻 Band-by-Band Analysis

The 20m band is the most consistent performer throughout the day and night, providing reliable propagation for both local and DX contacts. 40m and 80m are strong during nighttime and early morning, making them ideal for regional and long-haul QSOs. 17m and 15m are marginal but may yield contacts with persistence, especially using digital modes. 12m and 10m are mostly closed, with only occasional short-lived openings possible.

📊 Current Solar Activity

• K-index: 1 — Very quiet geomagnetic conditions, minimal disruptions to HF propagation.
• Solar Flux (10.7cm): 118 — Moderate solar activity; supports good propagation on 20m and below, but higher bands remain weak.
• Sunspot Number: 112 (real-time), trending in the 80–110 range — Stable, moderate solar activity.
• Space Weather Overview: No major flares or disturbances; X-ray flux at B4.9 indicates low risk of sudden HF blackouts.

📈 Geomagnetic Conditions

• The K-index has remained low (0–1) over the past 24 hours, indicating stable and quiet geomagnetic conditions.
• No recent spikes or disturbances, so expect consistent band performance and minimal fading or absorption.
• These quiet conditions favor long-haul DX, especially on low bands during the night.

🌟 Space Weather Details

• X-ray Activity: B4.9 — Low-level activity; no significant risk of HF blackouts or sudden ionospheric disturbances.
• Solar Wind: 514 km/s — Slightly elevated, but not enough to trigger geomagnetic storms; watch for minor increases in noise on higher bands.
• Particle Environment: Electron flux at 5870, proton flux at 494 — Both within normal ranges; no significant impact on propagation.
• Aurora Activity: Level 1 — Very low; VHF/UHF auroral propagation is not expected.
• Helium Line: 117.9 — Indicates stable solar output; no major trends or flare risk.

📡 Propagation Timeline & Technical Details

Recent months show a gradual decline in solar flux (from 160 in December to 130 in March/April) and sunspot numbers (from 124 to 85). This trend means high bands (12m/10m) are less likely to open, while 20m and lower remain reliable. The current solar cycle phase is stable, with no major upswings or downswings.

🔮 3-Day Forecast

• HF conditions are expected to remain stable with continued low geomagnetic activity.
• 20m, 40m, and 80m will continue to be the best bands for reliable contacts.
• No significant solar storms or flare activity are forecasted; expect minimal disruptions.
• 12m and 10m will likely remain poor, but monitor for brief openings around local noon, especially with digital modes.
• No alerts or warnings for amateur radio operators at this time. Continue to monitor real-time K-index and solar flux for any sudden changes.