Sun Images for Past 72 Hours
Images copyrighted by the SDO/NASA and Helioviewer project
📋 Propagation Summary:
HF propagation is looking favorable today thanks to a high solar flux of 201 and a strong sunspot number of 146, both supporting robust ionization for higher bands. Expect good to excellent conditions on 20m through 10m during daylight hours, with lower bands (80m/40m) performing best at night. The K-index is low, indicating quiet geomagnetic conditions and minimal disruptions. Operators should take advantage of the current solar activity for DX, especially on the higher bands, but watch for potential short-term blackouts due to elevated X-ray activity (C4.9). Now is a great time to try for long-haul contacts and rare DX!
💡 Operator Tips
- Focus your DX efforts on 20m, 17m, 15m, 12m, and 10m during the day—these bands are open and lively.
- Use FT8, CW, and SSB for best results; digital modes will punch through even if conditions dip.
- For nighttime operation, shift to 40m and 80m for regional and intercontinental contacts.
- Keep an eye on sudden blackouts due to X-ray flares; have backup frequencies ready.
- If you’re chasing awards or rare DX, check grayline times for enhanced propagation.
- Portable and QRP ops: higher bands are forgiving today—try 10m/12m for big results with small setups!
⏰ Best Operating Times
- 80m & 40m: Best after sunset and through the night; avoid daytime for DX.
- 20m, 17m, 15m: Excellent from sunrise through late afternoon; good into early evening.
- 12m & 10m: Peak from late morning to mid-afternoon; may close quickly after sunset.
- Grayline (dawn/dusk): All bands benefit, especially for long-haul east-west paths.
🌍 DX Opportunities
- 20m–10m: Wide open for global DX, especially across the Atlantic and Pacific.
- Grayline: Enhanced paths to Asia and Oceania in the morning; Europe and Africa at sunset.
- Special events: Elevated solar flux means rare DX stations will be workable on higher bands.
- Aurora: Low activity today, so VHF auroral propagation is unlikely.
📻 Band-by-Band Analysis
| Band | Morning | Day | Evening | Night |
|---|---|---|---|---|
| 80m | 🔴 Poor | 🔴 Poor | 🟡 Good | 🟡 Good |
| 40m | 🔴 Poor | 🔴 Poor | 🟡 Good | 🟡 Good |
| 20m | 🟡 Good | 🟡 Good | 🟡 Good | 🟡 Good |
| 17m | 🟡 Good | 🟡 Good | 🟡 Good | 🟡 Good |
| 15m | 🟡 Good | 🟡 Good | 🟡 Good | 🟡 Good |
| 12m | 🟡 Good | 🟡 Good | 🟡 Good | 🔴 Poor |
| 10m | 🟡 Good | 🟡 Good | 🟡 Good | 🔴 Poor |
Analysis:
20m, 17m, and 15m are the top performers throughout the day and into the evening, offering reliable DX and regional contacts. 12m and 10m are also in good shape during daylight but fade quickly after sunset. 80m and 40m are best reserved for nighttime operation, with poor conditions during the day but improving after dark for both local and long-distance QSOs.
📊 Current Solar Activity
Solar Activity Metrics
K-index
Solar Flux (10.7cm)
Sunspot Number
- K-index: 2 (quiet)—minimal geomagnetic disturbance, stable HF propagation.
- Solar Flux: 201 (very high)—excellent ionization, supports strong propagation on upper HF bands.
- Sunspot Number: 146 (high)—indicates a very active sun, boosting band openings.
- Space Weather: High solar activity, but currently no major geomagnetic storms or warnings.
📈 Geomagnetic Conditions
- The K-index has remained low and stable over the past 24 hours, indicating quiet geomagnetic conditions.
- No recent spikes or disturbances, so HF propagation is unaffected by geomagnetic storms.
- Expect continued stability unless a solar event occurs.
🌟 Space Weather Details
Space Weather Dashboard
X-ray Activity
Solar Wind Speed
Aurora Activity
- X-ray Activity: C4.9—moderate, with potential for brief HF blackouts on the sunlit side. Stay alert for sudden signal fades.
- Solar Wind Speed: 417 km/s—slightly elevated but not enough to trigger geomagnetic storms.
- Electron Flux: 2130—high, which can cause minor absorption on lower bands but generally supports strong F-layer propagation.
- Proton Flux: 151—normal, no significant impact.
- Aurora Level: 1—very low, so auroral propagation on VHF/UHF is not expected.
- Helium Line: 122.9—steady, indicating solar activity is active but not spiking.
📡 Propagation Timeline & Technical Details
Propagation Quality Timeline (24 Hours)
- Over the past several months, solar flux and sunspot numbers have trended upward from spring lows, now reaching some of the highest values of the year.
- This upward trend is fueling the current excellent HF conditions, especially on the higher bands.
- No major dips or spikes in solar activity, so expect consistent propagation.
Solar Activity Trends (6 Months)
🔮 3-Day Forecast
3-Day K-index Forecast
- Propagation is expected to remain strong with continued high solar flux and sunspot numbers.
- K-index should stay low, barring any unexpected solar flares or CME events.
- 20m–10m will continue to be the best bands for DX and contesting.
- No significant space weather warnings at this time—enjoy the bands and work those rare ones!