Amateur Radio Propagation Report

Sun Images for Past 72 Hours

Images copyrighted by the SDO/NASA and Helioviewer project

📋 Propagation Summary:
Today’s HF propagation is being heavily influenced by a combination of low solar flux (105), a moderate sunspot count (46), and elevated geomagnetic activity (K-index 5, A-index 26). Expect challenging conditions on most HF bands, with only the mid-high bands (17m, 15m) offering fair openings, while lower and upper bands (80m–40m, 20m, 12m, 10m) are mostly poor or closed. Operators should anticipate increased noise, fading, and limited DX, especially on the lower bands. For best results, focus on shorter skip and regional contacts, and monitor for brief DX windows on 15m and 17m.

💡 Operator Tips

• Prioritize 17m and 15m for daytime activity; these bands offer the best chance for contacts under current conditions.
• Use digital modes (FT8, FT4, PSK31) to maximize weak signal performance, especially during geomagnetic disturbances.
• Lower your noise floor: employ narrow filters and noise reduction features to combat increased QRM/QRN.
• If chasing DX, watch for grayline openings around sunrise/sunset—these may provide brief, enhanced paths.
• For contests or nets, concentrate on regional rather than intercontinental contacts today.
• Portable and mobile operators: deploy resonant antennas and use higher power if possible to punch through the noise.

⏰ Best Operating Times

• 17m and 15m: Best from late morning to mid-afternoon.
• 80m/40m: Try pre-dawn or late evening for local/regional contacts.
• 20m, 12m, 10m: Not recommended today.

🌍 DX Opportunities

• Grayline: Brief DX windows may occur at local sunrise/sunset, especially on 17m and 15m.
• Auroral paths: With aurora at level 5, high-latitude operators may see enhanced VHF/UHF auroral propagation—watch for CW/SSB bursts on 6m/2m.
• Equatorial paths: Limited, but check 17m/15m for possible short-skip openings.
• Special events: No major propagation events forecast; monitor clusters for surprise DX.

📻 Band-by-Band Analysis

Analysis:
17m and 15m are the only bands offering fair propagation throughout the day and evening—focus your efforts here for both local and possible DX. 80m, 40m, 20m, 12m, and 10m are all poor or closed due to low solar flux and high geomagnetic activity; expect high noise and weak signals. Short skip may be possible on 17m/15m, but long-haul DX is unlikely.

📊 Current Solar Activity

• K-index: 5 (elevated geomagnetic activity)—expect increased noise, fading, and possible HF blackouts.
• Solar Flux: 105 (low)—limits maximum usable frequency (MUF), reducing high-band openings.
• Sunspot Number: 46 (moderate, but declining)—supports only minimal ionization for HF propagation.
• Space Weather Overview: Recent solar activity has trended downward, with no major flares but persistent minor disturbances.

📈 Geomagnetic Conditions

• The K-index has been elevated (currently 5), indicating ongoing geomagnetic storm conditions.
• Over the past 24 hours, the K-index has remained high or increased, showing worsening geomagnetic stability.
• Expect continued absorption and signal fading, especially on polar and trans-equatorial paths.

🌟 Space Weather Details

• X-ray Activity: B5.0 (low-level)—no significant HF blackouts, but minor absorption possible.
• Solar Wind: 493 km/s (moderately fast)—contributes to geomagnetic disturbances and aurora.
• Particle Environment: Electron flux at 1930 (elevated)—can cause increased D-layer absorption and noise on HF.
• Aurora Activity: Level 5 (active)—northern operators may experience auroral flutter or enhanced VHF propagation; HF polar paths degraded.
• Helium Line: 106.6—stable to slightly elevated, suggesting no major flare risk but continued unsettled conditions.

📡 Propagation Timeline & Technical Details

• Over the past several months, solar flux and sunspot numbers have declined from their late-2025 peaks (SF 160, SSN 133) to current lower values (SF 105, SSN 46–85).
• This downward trend means overall HF propagation is less robust, especially on higher bands.
• Recent days have seen persistent geomagnetic disturbances, further degrading band conditions.

🔮 3-Day Forecast

• HF bands: Expect continued challenging conditions, with only 17m and 15m offering fair chances for contacts.
• Geomagnetic activity: Likely to remain elevated for the next 48–72 hours; monitor for sudden improvements if K-index drops.
• Best strategy: Focus on digital modes and mid-bands, check for grayline DX, and be ready for rapid changes in band openings.
• VHF/UHF: Watch for auroral openings at high latitudes, especially during geomagnetic peaks.
• No major alerts, but stay tuned to space weather updates for sudden solar or geomagnetic events.