Contains:  Solar system body or event
The Sun - In Calcium H, 


            Jason Guenzel

The Sun - In Calcium H

Acquisition type: Lucky imaging

Technical card

Imaging telescopes or lenses: Explore Scientific AR152 Achromatic Refractor

Imaging cameras: ZWO ASI174MM-Cool

Mounts: Celestron Advanced VX

Software: PixInsight  ·  firecapture  ·  Adobe Photoshop

Date: Oct. 4, 2019

Time: 10:58

Frames: 669

FPS: 128.00000

Focal length: 2470

Seeing: 3

Resolution: 1350x1080

Data source: Backyard


Now for something a little bit different. When you view the sun through a filter that isolates light associated with Calcium, areas of intense magnetic activity can be seen. This light is centered around 397nm, which is on the ultraviolet end of the spectrum at the very edge of human visibility. It’s a new filter to me and opens up some interesting options. Stay tuned!
At the top of the image you can see Active Region 2749. It had almost faded from view, it can still be seen in calcium light as an area of disturbance in this image from yesterday, 04-OCT-2019.