# Sun (AR 4197) in H-alpha and Calcium-K

Sun (AR 4197) in H-alpha and Calcium-K. Photograph of the sun by Giancarlo Erra. Photographed with Skywatcher GTI and Svbony 432MC.

- **Category:** Solar
- **Equipment:** Skywatcher GTI · Svbony 432MC · Daystar Quark Hydrogen Alpha · Antlia CaK 3nm · AstroDMX with Kstars/Indi · Pixinsight – Photoshop
- **Published:** 2025-09-03

![Sun (AR 4197) in H-alpha and Calcium-K](https://astro.observer/images/sun-ar-4197-in-h-alpha-and-calcium-k/sun-ar-4197-in-h-alpha-and-calcium-k-3200.jpg?v=f4c9029bff)

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Copyright Giancarlo Erra, all rights reserved. Licence: https://astro.observer/licence/

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