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 111 and sunspot numbers in the high 50s to 70s, expect good performance on 20m and lower bands, while higher bands (12m, 10m) will be challenging. The K-index is at 1 or lower, so noise and absorption are minimal, making for stable conditions. Operators should focus on mid and lower HF bands for reliable contacts, especially during local night and early morning hours. DX is possible on 20m and 17m, but 10m openings will be rare.
💡 Operator Tips:
- Use 20m and 40m for daytime and evening DX; these bands are most reliable now.
- Digital modes (FT8, PSK31) will outperform SSB/CW on marginal bands like 17m, 15m, and above.
- For local/regional contacts, 80m and 40m at night will be strong.
- Check grayline times for enhanced DX, especially on 40m and 20m.
- Keep an eye on real-time cluster spots for any surprise 10m/12m openings.
- If contesting, focus on 20m and 40m for rate; try 17m/15m for multipliers.
⏰ Best Operating Times
- 80m/40m: Best at night and early morning (domestic and regional QSOs)
- 20m: All-day performer, especially strong from late morning through sunset for DX
- 17m/15m: Late morning to afternoon for possible short/medium-haul DX
- 12m/10m: Limited openings, try midday for any sporadic-E or short-skip
- Grayline (sunrise/sunset): Enhanced long-path DX on 40m and 20m
🌍 DX Opportunities
- 20m: Most consistent for intercontinental DX, especially during grayline.
- 17m/15m: Occasional DX, especially to equatorial and southern latitudes during local afternoon.
- 40m: Nighttime DX to opposite hemisphere possible, especially around grayline.
- Grayline: Watch for enhanced propagation on 40m/20m at local sunrise/sunset.
- Special events: Low geomagnetic activity means polar paths are open; try north-south DX.
📻 Band-by-Band Analysis
| Band | Morning | Day | Evening | Night |
|---|---|---|---|---|
| 80m | 🟡 Good | 🟠 Fair | 🟡 Good | 🟢 Excellent |
| 40m | 🟡 Good | 🟠 Fair | 🟡 Good | 🟢 Excellent |
| 20m | 🟡 Good | 🟡 Good | 🟡 Good | 🟡 Good |
| 17m | 🟠 Fair | 🟠 Fair | 🟠 Fair | 🟠 Fair |
| 15m | 🟠 Fair | 🟠 Fair | 🟠 Fair | 🟠 Fair |
| 12m | 🔴 Poor | 🔴 Poor | 🔴 Poor | 🔴 Poor |
| 10m | 🔴 Poor | 🔴 Poor | 🔴 Poor | 🔴 Poor |
Analysis:
- Best bands: 20m is the most reliable for DX and general operation all day. 40m and 80m are excellent at night for both local and some DX.
- Marginal bands: 17m and 15m may offer some openings, especially for digital modes, but expect mostly fair conditions.
- Challenging bands: 12m and 10m are mostly closed—try only if you see cluster spots or during strong sporadic-E events.
📊 Current Solar Activity
Solar Activity Metrics
K-index
Solar Flux (10.7cm)
Sunspot Number
- K-index: 1 (very quiet) — Minimal geomagnetic disturbance, excellent for HF stability.
- Solar Flux: 111 — Moderate, supporting good propagation up to 20m and occasional 17m/15m openings.
- Sunspot Number: 58 (current), trending 70–120 over recent months — Indicates a declining but still active solar cycle phase.
- Space Weather: No significant flares or disturbances; X-ray flux is at B7.9 (quiet).
📈 Geomagnetic Conditions
- The K-index has remained very low (0–1) over the past 24 hours, indicating stable and quiet geomagnetic conditions.
- No recent geomagnetic storms or disturbances—great news for HF.
- Expect continued low noise and minimal absorption, especially on lower bands.
🌟 Space Weather Details
Space Weather Dashboard
X-ray Activity
Solar Wind Speed
Aurora Activity
- X-ray Activity: B7.9 — Indicates low solar flare activity; no risk of HF blackouts.
- Solar Wind: 347.8 km/s — Typical, not fast enough to trigger geomagnetic storms.
- Particle Environment: Electron flux at 2330 (moderate), proton flux at 11 (quiet); no significant impact on HF.
- Aurora Activity: 1 — Very low, so no auroral propagation expected on VHF/UHF.
- Helium Line: 103.4 — Stable, suggesting no major solar changes imminent.
📡 Propagation Timeline & Technical Details
Propagation Quality Timeline (24 Hours)
- Over the past several months, solar flux has declined from 160+ to around 120, and sunspot numbers have dropped from 120+ to the high 70s.
- This trend means high bands (10m/12m) are less likely to open, but mid/low bands (20m/40m) remain robust.
- No major solar events or storms have occurred recently, so conditions are steady.
Solar Activity Trends (6 Months)
🔮 3-Day Forecast
3-Day K-index Forecast
- Propagation is expected to remain stable with continued low K-index and moderate solar flux.
- No major solar storms or flares are forecasted.
- Best bands: 20m, 40m, and 80m will continue to perform well; 17m/15m may open for digital modes.
- Worst bands: 12m/10m likely to remain poor/closed except for rare sporadic-E.
- No alerts or warnings for HF or VHF operators at this time.