Week 23 / 2026 | June 1 – 7 | SFI 142 | SSN 133 | A 15 | K 3 | X-Ray B9.2
Summary
The recovery continues — emphatically. Solar Flux surges to 142, up 18 points from week 22 (SFI 124). The Sunspot Number jumps to 133 — the highest value in weeks. Nine active regions are visible on the solar disc, with AR 4452 (N10W61, beta-gamma) the most complex region and most likely M-flare producer.
Geomagnetic conditions were active over the weekend — Kp reached 4.3 on Friday evening (May 30), driven by a coronal hole high-speed stream (CH-HSS). Settling begins Monday: NOAA forecasts Kp 2 from Tuesday with quiet conditions for the rest of the week. Flare probabilities remain notable: C-class 95%, M-class 40%, X-class 5%. However, no noteworthy flare events were recorded in the past 72 hours.
The combination of SFI 140+, rising solar activity and June Sporadic E makes week 23 one of the most promising weeks of the year. Upper bands are in top form, and 6 metres can produce spectacular openings at any time.
Band Forecast
SFI 142 is excellent — upper bands benefit massively. 15 metres delivers reliably, 12 metres becomes regularly usable, and 10 metres shows both F2 and Es openings. The NOAA long-term forecast for June averages SFI 141 — we’re starting the week above the monthly mean.
| Band | Day | Night | Notes |
|---|---|---|---|
| 160m | Poor | Poor | Season over — nights too short, high QRN |
| 80m | Fair | Fair to good | Intra-EU evenings still possible, DX virtually ruled out |
| 40m | Good | Good | Reliable — NA/JA paths from 20 UTC, worldwide via FT8 |
| 30m | Good | Good | Stable around the clock, FT8/CW deliver consistently |
| 20m | Very good | Good | Main band — worldwide openings, long opening hours into the evening |
| 17m | Very good | Fair | At SFI 140+ excellent daytime — DX to JA, VK, W reliably |
| 15m | Good to very good | Poor | F2 openings stable, often surprisingly good afternoons |
| 12m | Good | Poor | F2 back, Es support frequent — 24 MHz regularly open |
| 10m | Good (F2 + Es) | Poor | Double openings possible: F2 mornings, Es afternoons/evenings |
| 6m | Good (Es) | Poor | June = peak month! Daily Es openings likely |
Geomagnetic Forecast
Weekend disturbance subsiding. From Tuesday onwards, quiet conditions — ideal for upper bands.
| Day | Kp expected | SFI Forecast | Assessment |
|---|---|---|---|
| Sun, Jun 1 | 3–4 | 140 | CH-HSS residual — slightly unsettled |
| Mon, Jun 2 | 2–3 | 140 | Settling — usable conditions |
| Tue, Jun 3 | 1–2 | 142 | Quiet — excellent for DX |
| Wed, Jun 4 | 1–2 | 142 | Quiet — upper bands in top form |
| Thu, Jun 5 | 1–2 | 140 | Steady quiet — best DX window |
| Fri, Jun 6 | 2 | 138 | Still good — slight flux decline possible |
| Sat, Jun 7 | 2 | 138 | Good weekend for VHF and HF |
Recommendations for the Coming Week
- 17 metres is the band of the week: At SFI 140+, 17m delivers constant daytime DX. While 20m is often crowded, 17m offers more space and excellent conditions. Morning JA/VK, afternoon worldwide, evening NA.
- Use 15 metres! High flux brings 15m to a level we missed in recent weeks. Afternoon F2 openings to SA and AF, also W possible.
- Don’t forget 12/10 metres: With F2 foundation plus Es support, surprises possible on 12m and 10m. Double openings (F2 morning + Es afternoon) are common in June.
- 6 metres: June IS the month! The Sporadic E season reaches its peak. Daily openings on 50 MHz are likely, multi-hour runs over 2,000+ km possible. FT8 on 50.313 MHz, SSB on 50.150 MHz. A Yagi antenna significantly increases your chances.
- Be patient Sun/Mon: CH-HSS residual effects may still lightly impact lower bands. From Tuesday: ideal conditions.
- Wed–Fri = prime DX window: Kp 1–2 at SFI 140+ — perfect combination for DX on all bands from 40 to 10 metres.
Week 22 Review and Outlook
The recovery rally after the SFI low at 101 (week 21) continues impressively: 101 → 124 → 142 in just three weeks. The NOAA long-term forecast for June 2026 stands at SFI 141 (mean) and SSN 104 — we enter the first week of June above the predicted monthly average. Cycle 25 remains strong.
Nine visible active regions drive the high flare probability. AR 4452 with beta-gamma configuration is heading towards the western limb. Regions at the eastern limb (AR 4455, AR 4456) contribute fresh magnetic material and could sustain the flux.
For VHF enthusiasts: June 1 marks the start of the statistical peak phase of Sporadic E season. The next four weeks offer the highest probability for Es openings on 6 m and 2 m. Anyone with VHF Yagi antennas or a transverter should monitor 50 MHz daily. The full moon on May 31 also offers good conditions for EME on 2 m and 70 cm.
Live Data
| Band | Tag ☀ | Nacht ☾ |
|---|---|---|
| 160m | Schlecht | Mäßig |
| 80–40m | Mäßig | Gut |
| 30–20m | Gut | Gut |
| 17–15m | Gut | Gut |
| 12–10m | Mäßig | Schlecht |
Further Reading
- MUF Maps (prop.kc2g.com)
- NOAA Space Weather Prediction Center
- HamQSL Solar Dashboard
- DXHeat DX Cluster
- SolarHam
Transparency Notice
This weather report was created with the assistance of AI (Claude, Anthropic) based on current data from NOAA/SWPC, HamQSL and SolarHam. All content has been reviewed by the oeradio.at editorial team. Corrections or additions to [email protected].
