Amateur Radio Propagation Report

📋 Propagation Summary: Today’s HF propagation is shaped by moderate solar activity with a solar flux of 148 and a sunspot number of 154, both supporting decent daytime conditions on the higher bands. The K-index is at 3, indicating mild geomagnetic activity—not severe enough to cause major disruptions, but enough to slightly limit polar and trans-equatorial paths. Expect good openings on 20m, 17m, and 15m during daylight, while 12m and 10m will be more variable. Nighttime favors the lower bands, but with only fair conditions. Operators should take advantage of daylight hours for DX and be alert for brief band enhancements.

💡 Operator Tips

• Use 20m, 17m, and 15m for reliable daytime DX—these bands are currently the most robust.
• For nighttime operation, focus on 40m and 80m, but expect only fair results; digital modes like FT8 or CW will outperform SSB.
• Monitor 10m and 12m for sporadic E or short-lived openings, especially during local midday.
• Keep an eye on the K-index; if it rises, expect increased absorption and fading, especially on polar paths.
• For contests or DXpeditions, plan major efforts during daylight on the higher bands, and use grayline times for best long-haul results.

⏰ Best Operating Times

• 80m/40m: Best at night and around sunrise/sunset.
• 20m/17m/15m: Best from late morning through late afternoon.
• 12m/10m: Try midday and early afternoon; watch for short, sporadic openings.
• Grayline: Both sunrise and sunset offer enhanced long-path and trans-equatorial opportunities, especially on 20m and 17m.

🌍 DX Opportunities

• 20m, 17m, and 15m are open for intercontinental DX during daylight, especially on east-west paths.
• Grayline propagation is favorable on 40m and 20m—target regions just entering or leaving daylight for best results.
• 10m/12m may offer brief DX windows, especially for stations in the southern hemisphere or during sporadic E events.
• Auroral activity is low (Aurora index 3), so VHF aurora is unlikely, but keep an ear out in northern latitudes.

📻 Band-by-Band Analysis

Analysis:
The best daytime bands are 20m, 17m, and 15m (🟡 Good all day and night), offering reliable DX and regional coverage. 12m and 10m are fair (🟠) during daylight but close down at night (🔴 Poor). 80m and 40m are only fair (🟠) at night and poor during the day (🔴), so expect limited performance except during grayline. For maximum reach, operate on 20m–15m during daylight and switch to 40m/80m after sunset.

📊 Current Solar Activity

• K-index: 3 (mild geomagnetic activity)—slight absorption, especially on polar paths, but no major storm.
• Solar Flux: 148 (moderate to high)—supports good F-layer propagation, especially on 20m–15m.
• Sunspot Number: 154 (above average)—increases MUF, boosting higher band openings.
• Space Weather: No major flares, but X-ray flux at C1.7 indicates some risk of short HF blackouts.

📈 Geomagnetic Conditions

• The K-index has been mostly stable around 3 over the past 24 hours, with no significant spikes.
• Conditions are not stormy, but minor disturbances may cause some fading or absorption, especially at higher latitudes.
• If the K-index rises above 4, expect more pronounced disruptions, especially on 10m–20m and polar routes.

🌟 Space Weather Details

• X-ray Activity: C1.7 level—moderate, with a slight risk of brief HF blackouts, especially on sunlit paths.
• Solar Wind: 409.5 km/s—moderate speed, can enhance minor geomagnetic activity but not enough for major storming.
• Particle Environment: Electron flux at 2700 and proton flux at 398—elevated electrons may cause minor polar absorption; proton levels are not stormy.
• Aurora Activity: 3—low, so auroral propagation on VHF/UHF is unlikely.
• Helium Line: 121.1—steady, indicating no dramatic solar trend shifts.

📡 Propagation Timeline & Technical Details

• Recent solar flux has trended slightly downward from a peak in December 2025 (160) to current values (130–148), but remains strong for HF.
• Sunspot numbers have fluctuated, peaking mid-2025 and now holding steady in the 80–150 range—still favorable for high-band propagation.

🔮 3-Day Forecast