# Sun disc in hydrogen alpha

The solar disc in hydrogen alpha, the red line of hydrogen at 656.28 nm. The DayStar Quark passes half an angstrom or less of that line, narrow enough to show the chromosphere, the layer above the visible surface, instead of the surface itself. Photographed with a Skywatcher Esprit 100 at 550mm through a DayStar Quark Chromosphere filter, on an ASI120MM.

- **Category:** Solar
- **Equipment:** Skywatcher HEQ5 – Skywatcher Esprit 100 F/5.5 Triplet Super APO (550mm) – Daystar Quark Chromosphere HA – ASI120MM
- **Published:** 2026-08-21
- **Photographed:** 2026-08-21

![Sun disc in hydrogen alpha](https://astro.observer/images/sun-disc-in-hydrogen-alpha/sun-disc-in-hydrogen-alpha-3200.jpg?v=2846f763a6)

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