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 moderately favorable, with a solar flux of 120 and sunspot numbers around 105, supporting decent conditions on the mid and lower bands. The K-index is currently at 2, indicating quiet geomagnetic activity, but recent spikes up to 4.67 suggest occasional disturbances. Expect good performance on 20m throughout the day and night, while higher bands (12m, 10m) may be less reliable, especially after sunset. Operators should watch for short-lived DX windows on higher bands during daylight and focus on 40m and 80m at night for reliable contacts.

💡 Operator Tips

• Use 20m for consistent daytime and evening contacts, including DX.
• 40m and 80m are your best bets for night-time operations and regional QSOs.
• For high bands (17m, 15m, 12m, 10m), try midday for possible short DX openings—monitor for rapid changes due to recent geomagnetic activity.
• Digital modes (FT8, FT4) will help pull signals through marginal conditions, especially on 12m/10m.
• Keep an eye on the K-index—if it rises, expect increased absorption and fading, especially on polar and trans-equatorial paths.
• For VHF/UHF, aurora is moderate; northern operators may try auroral modes, but widespread openings are unlikely.

⏰ Best Operating Times

• 80m/40m: Best at night and early morning (local time)
• 20m: Good all day and into the evening
• 17m/15m: Late morning to early afternoon
• 12m/10m: Late morning to mid-afternoon, especially during solar flux peaks
• DX: Focus on grayline periods (sunrise/sunset) for long-haul contacts

🌍 DX Opportunities

• Grayline propagation is favorable on 40m and 20m—target sunrise/sunset for best DX.
• 20m remains the most reliable band for intercontinental contacts today.
• Short-lived DX openings may occur on 17m and 15m during local noon, especially on north-south paths.
• 10m/12m: Watch for sporadic-E or brief F2 openings, but expect generally fair to poor conditions.
• Auroral propagation is possible at high latitudes; VHF aurora scatter may be marginal.

📻 Band-by-Band Analysis

Analysis:

• 20m is the most reliable band for all-day operation and DX, with consistently good conditions.
• 80m and 40m are solid choices at night and early morning, supporting both local and regional QSOs.
• 17m and 15m offer fair conditions, best around midday—watch for brief DX windows.
• 12m and 10m are marginal, with fair daytime conditions but likely to close after sunset.
• Best bands: 20m (all day), 40m/80m (night/morning).
• Challenging bands: 12m/10m (especially at night).

📊 Current Solar Activity

• K-index: 2 (quiet geomagnetic conditions currently, but recent spikes up to 4.67—monitor for sudden changes)
• Solar Flux: 120 (moderate; supports decent F-layer propagation, but not strong enough for robust high-band openings)
• Sunspot Number: 105 (moderate activity, helping to sustain 20m and some higher band propagation)
• Space Weather Overview:
  • X-ray flux: C2.4 (moderate solar flare activity; risk of short HF blackouts is low but possible)
  • Solar wind: 653 km/s (elevated; can trigger geomagnetic disturbances if sustained)
  • Aurora: 8 (moderate; some auroral activity possible at high latitudes)

📈 Geomagnetic Conditions

• Recent K-index trend:
  • Fluctuated between 1.33 and 4.67 over the past 24 hours, with a few moderate spikes.
  • Currently stable at 2, indicating quiet conditions.
  • Impacts:
    • Recent disturbances may have caused short-term absorption and fading, especially on polar paths.
    • If K-index rises again, expect more absorption and possible blackout periods on high-latitude and trans-polar routes.
    • For now, conditions are improving and relatively stable.

🌟 Space Weather Details

• X-ray Activity:
  • C2.4 class flare level—moderate. Occasional short HF blackouts are possible, especially on the sunlit side.
• Solar Wind:
  • 653 km/s (high). Fast solar wind can trigger geomagnetic activity, so monitor K-index for sudden changes.
• Particle Environment:
  • Electron flux: 2620 (elevated; may cause increased D-layer absorption, especially on lower bands during the day)
  • Proton flux: 37 (low; no major impact at this level)
• Aurora Activity:
  • Level 8 (moderate). Northern operators may see some auroral propagation on VHF, but widespread openings are unlikely.
• Helium Line:
  • 115.4 (moderate solar activity; no major trend up or down, so expect relatively stable conditions unless a flare occurs)

📡 Propagation Timeline & Technical Details

• Historical Trends:
  • Solar flux has decreased from ~160 in December to 135.9 in February/March, indicating a slight weakening of high-band conditions.
  • Sunspot numbers have also trended downward, from 124 in December to 78 in February, but remain sufficient for 20m reliability.
  • K-index has shown occasional spikes, but overall remains mostly in the quiet to unsettled range.

🔮 3-Day Forecast

• Expect continued moderate solar activity with solar flux in the 120–135 range and sunspots around 80–100.
• Geomagnetic conditions should remain mostly quiet (K=2–3), but brief unsettled periods are possible if solar wind remains elevated.
• 20m will continue to be the most reliable HF band for DX and general operation.
• 40m/80m will remain strong at night and early morning.
• High bands (17m–10m): Expect only fair conditions, with best chances for openings around local noon.
• No major alerts or warnings at this time, but monitor for sudden K-index increases and X-ray flare reports.
• Recommendation:
  • Focus on 20m for DX and contesting.
  • Use digital modes for marginal high-band conditions.
  • Check real-time K-index and solar data before planning long-haul or polar path operations.