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 and very quiet geomagnetic conditions. With a solar flux of 119 and sunspot numbers in the mid-40s, expect solid performance on the lower and mid bands (80m–20m), especially during nighttime and early morning hours. Higher bands (15m–10m) remain challenging due to lower solar flux and sunspot counts, so daytime DX on those bands will be limited. The K-index is extremely low (K=1), which means minimal geomagnetic disturbance and stable propagation, particularly for north-south paths. Operators should focus on the 20m and 40m bands for reliable contacts, and take advantage of the quiet geomagnetic field for long-haul DX, especially during grayline periods.
💡 Operator Tips
- Prioritize 20m and 40m for both local and DX contacts; these bands offer the best reliability today.
- Use digital modes (FT8, FT4, PSK31) to maximize weak signal performance, especially on higher bands where conditions are marginal.
- For DXers, target grayline windows around sunrise and sunset for enhanced propagation, particularly on 40m and 20m.
- Contesters and ragchewers: Operate during evening and night on 80m/40m for lower noise and stronger signals.
- Antenna tip: Vertical or dipole antennas with low takeoff angles will help reach distant stations, especially under quiet geomagnetic conditions.
- Monitor for sudden changes: While conditions are stable now, keep an ear on space weather alerts for any flare-related disruptions.
⏰ Best Operating Times
| Band | Best Times (UTC) | Notes |
|---|---|---|
| 80m | 20:00–08:00 | Strongest at night; good for local/regional |
| 40m | 18:00–10:00 | Night/early morning best for DX |
| 20m | 12:00–22:00 | Daytime/afternoon for worldwide coverage |
| 17m | 14:00–20:00 | Limited DX, mostly daytime |
| 15m | 16:00–19:00 | Occasional short openings, mostly fair |
| 12m | 17:00–19:00 | Poor, only brief or sporadic openings |
| 10m | 17:00–19:00 | Poor, check for sporadic-E or contest activity |
🌍 DX Opportunities
- Grayline DX: Enhanced paths on 40m and 20m at local sunrise/sunset—watch for long-haul openings to the opposite hemisphere.
- North-South paths: Favorable due to low geomagnetic activity; try South America, Africa, and Oceania on 20m/17m.
- Limited high-band DX: 15m, 12m, and 10m may open briefly, especially for stations in equatorial regions or during sporadic-E events.
- Aurora activity is minimal: VHF/UHF auroral propagation is unlikely today.
📻 Band-by-Band Analysis
| Band | Morning | Day | Evening | Night |
|---|---|---|---|---|
| 80m | 🟡 Good | 🟠 Fair | 🟡 Good | 🟡 Good |
| 40m | 🟡 Good | 🟠 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 reliable all-day performer, with consistent good conditions for both local and DX work.
- 40m and 80m are good at night and early morning, making them ideal for regional and some DX contacts.
- 17m and 15m offer fair conditions—worth checking for short DX or domestic openings, especially midday.
- 12m and 10m are generally poor; only try these bands if you hear activity or during contests.
- DXers: Focus on 20m during the day and 40m at night for best long-haul results.
📊 Current Solar Activity
Solar Activity Metrics
K-index
Solar Flux (10.7cm)
Sunspot Number
- K-index: 1 (very quiet) – Minimal geomagnetic disturbance, excellent for stable HF propagation.
- Solar Flux: 119 – Moderate; supports good conditions on 20m and below, but limits high-band openings.
- Sunspot Number: 44 – Below average; enough for mid-band activity, but not enough for strong high-band propagation.
- Space Weather: No major flares or disturbances reported; X-ray flux at C1.1 suggests only minor solar activity.
📈 Geomagnetic Conditions
- The K-index has remained low and stable (0–1) over the past 24 hours, indicating very quiet geomagnetic conditions.
- No recent geomagnetic storms or disturbances—propagation is stable and noise levels are low, especially at higher latitudes.
- Trend: Conditions are stable and favorable for HF operation, with no expected sudden changes.
🌟 Space Weather Details
Space Weather Dashboard
X-ray Activity
Solar Wind Speed
Aurora Activity
- X-ray Activity: C1.1 – Indicates minor solar flare activity; no significant HF blackouts expected.
- Solar Wind: 292 km/s – Low speed, contributing to quiet geomagnetic conditions and stable HF propagation.
- Particle Environment: Electron flux at 2600 and proton flux at 10 – Both are low, so no radio blackouts or polar absorption events are anticipated.
- Aurora Activity: 1 – Very low, so auroral propagation is not a factor for VHF/UHF today.
- Helium Line: 118.3 – Indicates steady solar activity; no major upswings or drops in solar output.
📡 Propagation Timeline & Technical Details
Propagation Quality Timeline (24 Hours)
- Recent solar flux has been steady to slightly rising over the past two months, supporting continued good conditions on 20m and below.
- Sunspot numbers have fluctuated but remain moderate, which helps keep the lower and mid bands open but limits higher band DX.
- Historical trend: After a dip in early spring, both solar flux and sunspot numbers have rebounded somewhat, but not to winter highs.
Solar Activity Trends (6 Months)
🔮 3-Day Forecast
3-Day K-index Forecast
- HF conditions are expected to remain stable with quiet geomagnetic activity and moderate solar flux.
- 20m and 40m will continue to be the best bands for both local and DX contacts.
- High bands (15m–10m) will remain challenging, with only brief or sporadic openings possible.
- No space weather alerts or warnings are in effect; continue to monitor for any sudden flare activity.
- Recommendation: Plan DX and contest activity around 20m/40m, and check higher bands for unexpected openings, especially during local afternoon hours.