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Solar Cycle 25 and the 10.7 cm radio solar flux
Following our previous guest post regarding the upcoming Solar Cycle 25 we have yet another guest post. This time from Patrick Geryl. Patrick does research in astrophysics, especially everything related to the Sun. He has currently published 3 articles on Researchgate. At this moment he is working with Jan Alvestad from Solen on an article: “High Resolution Sunspot Calculations.” He hopes to makes his breakthrough with his prediction about the start of Solar Cycle 25. Patrick claims that Solar Cycle 25 started in November 2018. How did he came to this conclusion? Keep reading to find that out.
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Space weather facts
| Last X-flare | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/04 | M1.0 |
| Last geomagnetic storm | 2026/04/03 | Kp7- (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2026 | 85.9 +7.7 |
| April 2026 | 121 +35.1 |
| Last 30 days | 101.1 +44.7 |