Amateur Radio Propagation Report

Sun Images for Past 72 Hours

Images copyrighted by the SDO/NASA and Helioviewer project

📋 Propagation Summary: HF propagation is currently challenging due to low solar flux (92) and a high K-index (5), indicating disturbed geomagnetic conditions. Most bands from 80m to 20m are experiencing poor propagation, with only 17m and 15m showing fair potential. Expect increased noise, signal fading, and limited long-distance contacts, especially on higher bands. Operators should focus on local and regional contacts and be prepared for rapid changes in conditions. Today, patience and flexibility will be key for successful QSOs.

💡 Operator Tips

• Prioritize 17m and 15m for daytime DX attempts; these bands offer the best chance for contacts under current conditions.
• Use NVIS (Near Vertical Incidence Skywave) techniques on 80m and 40m for reliable local/regional communication.
• Consider digital modes (FT8, JT65, PSK31) for weak-signal work, as they perform better during poor propagation.
• Use narrow filters and strong noise reduction to combat elevated noise and QSB (fading).
• Monitor the K-index and solar wind updates for sudden changes; avoid scheduling critical operations during geomagnetic storms.
• For contesters: focus on maximizing multipliers on 17m/15m, and check for short-lived band openings.

⏰ Best Operating Times

• 17m and 15m: Best chances for DX, especially during daylight hours.
• 80m/40m: Use for local nets and short-haul contacts, but expect high noise and weak signals.
• 20m/12m/10m: Generally closed or very poor; check sporadically for brief openings, especially around local noon.

🌍 DX Opportunities

• DX on 17m/15m: Watch for short, sporadic openings toward equatorial and low-latitude regions during local midday.
• Grayline: Limited enhancement expected due to low solar flux and high geomagnetic disturbance, but try sunrise/sunset for possible short-path openings.
• Aurora: Aurora activity is elevated (level 5); northern operators may experience auroral propagation on VHF, but HF will be further degraded at high latitudes.
• Special Events: No significant propagation events forecast; focus on monitoring for sudden band improvements.

📻 Band-by-Band Analysis

Currently, 17m and 15m are the only bands offering fair propagation throughout the day and night, making them the best options for both DX and domestic contacts. All other bands (80m, 40m, 20m, 12m, and 10m) are rated as poor at all times, with minimal chance for reliable communication. Operators should focus their efforts on 17m and 15m, and use digital modes to maximize success.

📊 Current Solar Activity

• K-index (Geomagnetic Activity): 5 (elevated) — indicates a geomagnetic storm in progress, causing signal absorption and fading, especially at high latitudes.
• Solar Flux (10.7cm): 92 — currently low, which limits maximum usable frequencies and reduces long-distance HF propagation.
• Sunspot Number: 55 — on the lower side, reflecting weaker ionospheric support for HF bands.
• Space Weather Overview: The combination of low solar flux and high K-index means poor HF propagation, with increased noise and absorption.

📈 Geomagnetic Conditions

• The K-index has risen to 5, showing a clear trend of geomagnetic disturbance over the past 24 hours.
• This elevated geomagnetic activity is likely due to a recent solar wind increase, leading to degraded HF conditions and possible auroral effects.
• Expect continued absorption, especially on polar and trans-auroral paths, and be alert for further K-index changes.

🌟 Space Weather Details

• X-ray Activity: B2.7 — low-level X-ray flux, so no major HF blackouts expected, but still some minor absorption possible.
• Solar Wind: 583.3 km/s — elevated speed, contributing to geomagnetic instability and increased K-index.
• Particle Environment: Electron flux (1590) and proton flux (384) are both elevated, which can cause increased D-layer absorption and further degrade HF propagation.
• Aurora Activity: Level 5 — moderate auroral activity; northern operators may see VHF auroral propagation, but HF will be more affected by absorption and flutter.
• Helium Line: 103.8 — trending lower, indicating a general decrease in solar activity and further limiting HF band openings.

📡 Propagation Timeline & Technical Details

• Over the past several months, both solar flux and sunspot numbers have shown a declining trend (from ~138 in June to 105 in September for solar flux, and sunspots dropping from 101 to 60).
• This downward trend is reflected in the current poor HF conditions, as the ionosphere is less energized and less able to support high-frequency propagation.

🔮 3-Day Forecast

• Next 3 days: Expect continued poor to fair HF conditions, with 17m and 15m remaining your best bets for any DX or longer-haul contacts.
• K-index may remain elevated, so watch for further geomagnetic disturbances.
• No major solar events are forecast, so significant improvement is unlikely in the short term.
• Recommendations: Focus on digital modes, monitor for brief band openings, and check VHF for auroral propagation if you are in northern latitudes. Avoid relying on 20m and below for reliable DX until solar and geomagnetic conditions improve.