Images 4
Download ZIP
Equipment
| Spectroheliograph | MLAstro SHG 700 |
| Telescope | Takahashi FS78 |
| Focal Length | 630 mm |
| Aperture | 78 mm |
| Camera | ZWO ASI678MM |
| Pixel Size | 2.0 µm |
| Binning | 1x |
| Mount | Vixen SX2 |
| ERF | 0 |
| Software | JSol'Ex 5.0.2 |
Location
51.3, 7.2 (approx.)
Notes
On November 11, 2025, active region AR 4274 produced an exceptionally powerful X5.1 flare at 10:04 UT during the ongoing Solar Cycle 25. As of now, this flare is the most energetic solar eruption of the year 2025. By chance, I had observed the region shortly beforehand in several spectral lines using a spectroheliograph—my spectroheliogram was taken just 23 minutes before the flare. It was actually only a brief scan under modest seeing conditions, but in retrospect it is fascinating to see what the region looked like shortly before such a strong event.