Sun Images for Past 72 Hours
Images copyrighted by the SDO/NASA and Helioviewer project
📋 Propagation Summary:
Today’s HF propagation is shaped by moderate solar activity with a solar flux of 95 and a sunspot number of 46. The geomagnetic field is very quiet (K-index: 1), which means low noise and stable conditions, especially for the lower bands. Expect good performance on 20m and 40m, with 80m also favorable at night. Higher bands (15m, 12m, 10m) are mostly poor due to lower solar flux and sunspot numbers. For best results, focus on the lower and mid bands during their optimal times, and watch for brief DX openings on 17m and 15m. No significant space weather alerts are active, so enjoy stable conditions for both casual and DX operation.
💡 Operator Tips:
- Use 20m and 40m for reliable daytime and evening contacts; these bands are your best bet for both local and DX QSOs.
- 80m will be strong at night—great for regional nets and ragchews.
- Try digital modes (FT8, PSK31) on 17m and 15m to take advantage of marginal openings.
- Keep antennas low-noise and check for grayline propagation at sunrise/sunset for DX.
- With low geomagnetic activity, verticals and dipoles will perform well; no need for special noise mitigation today.
- Contest and DXers: Focus on 20m for daytime DX and 40m/80m for evening/nighttime long-haul contacts.
⏰ Best Operating Times
| Band | Best Times (UTC) | Notes |
|---|---|---|
| 80m | 20:00–08:00 (Night) | Excellent for local/regional QSOs |
| 40m | 18:00–10:00 (Evening/Night) | Good for both local and DX |
| 20m | 10:00–22:00 (Day/Evening) | Best for daytime DX |
| 17m | 12:00–18:00 (Day) | Some fair DX, especially digital |
| 15m | 12:00–16:00 (Day) | Occasional fair openings |
| 12m | 14:00–16:00 (Day) | Mostly poor, brief openings possible |
| 10m | 14:00–16:00 (Day) | Poor, but check for sporadic-E |
🌍 DX Opportunities
- Grayline DX: Watch for enhanced propagation on 40m and 20m during sunrise and sunset—especially for east-west paths.
- 20m: Best shot at daytime DX, especially transatlantic and transpacific.
- 17m/15m: Brief, fair openings possible around local noon—digital modes recommended.
- 80m/40m: Nighttime DX possible, especially with low K-index.
- No significant aurora or polar path enhancement; VHF aurora unlikely.
- No major solar events or special propagation phenomena expected today.
📻 Band-by-Band Analysis
| Band | Morning | Day | Evening | Night |
|---|---|---|---|---|
| 80m | 🟠 Fair | 🟠 Fair | 🟡 Good | 🟡 Good |
| 40m | 🟠 Fair | 🟠 Fair | 🟡 Good | 🟡 Good |
| 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:
20m is the most consistent performer throughout the day and evening, offering good DX and reliable contacts. 40m and 80m are best at night and evening for both local and DX, with fair conditions during the day. 17m and 15m may yield some contacts, especially with digital modes, but expect only fair conditions. 12m and 10m are mostly closed—check for rare sporadic-E or short-lived openings, but don’t expect much activity.
📊 Current Solar Activity
Solar Activity Metrics
K-index
Solar Flux (10.7cm)
Sunspot Number
- K-index: 1 (very quiet) – Low geomagnetic disturbance, minimal noise, and stable propagation.
- Solar Flux (10.7cm): 95 (low) – Limits MUF, so higher bands are weak; favors lower bands.
- Sunspot Number: 46 (low-moderate) – Not enough for strong high-band openings, but supports 20m and below.
- Space Weather Overview: No major flares or disturbances; X-ray flux at B4.7 is low, indicating stable ionosphere.
📈 Geomagnetic Conditions
- The K-index has remained very low and stable over the past 24 hours, indicating a quiet geomagnetic field.
- No recent spikes or geomagnetic storms; conditions are improving compared to any prior unsettled periods.
- Expect low noise and minimal fading, especially on the lower bands.
🌟 Space Weather Details
Space Weather Dashboard
X-ray Activity
Solar Wind Speed
Aurora Activity
- X-ray Activity: B4.7 (low) – No risk of HF blackouts; stable D-layer absorption.
- Solar Wind: 330 km/s (quiet) – No significant geomagnetic triggering; supports steady propagation.
- Particle Environment:
- Electron Flux: 1840 (moderate) – No major impact, but can contribute to minor absorption on high bands.
- Proton Flux: 9 (quiet) – No polar cap absorption events.
- Aurora Activity: 2 (very low) – No auroral propagation; VHF/UHF aurora unlikely.
- Helium Line: 104.8 – Indicates stable solar activity; no major uptrends or flares.
- Practical Impact: No enhanced absorption or auroral effects; expect normal HF conditions, especially on lower bands.
📡 Propagation Timeline & Technical Details
Propagation Quality Timeline (24 Hours)
- Over the past several months, solar flux has declined from highs around 138 to the current 95, and sunspot numbers have also decreased from over 100 to the mid-40s.
- This downward trend means high bands (15m/12m/10m) are less likely to open, while 20m and lower bands remain the mainstay for reliable contacts.
- Quiet geomagnetic conditions have helped stabilize propagation, especially at night.
Solar Activity Trends (6 Months)
🔮 3-Day Forecast
3-Day K-index Forecast
- Expect continued quiet geomagnetic conditions (low K-index) and no major solar events.
- 20m, 40m, and 80m will remain the best bands for reliable operation.
- 15m and 17m may offer brief, fair openings—especially for digital modes.
- 10m and 12m likely to stay poor/closed unless a surprise solar uptick occurs.
- No alerts or warnings for HF or VHF operators. Continue to monitor for any sudden solar changes, but stable, quiet conditions should persist for the next few days.