Solar Corona, Chromosphere, Prominences

Pixinsight HDR Multiscale processing added to the corona and improved dynamic range managementThe corona data was taken with 18 HDR exposures from 0.8 to 1/320 sec with a Sony a6300 crop sensor mirrorless camera and a William Optics RedCat 250/51mm f/5 Petzval refractor. The solar disk and prominence data was taken with a Questar 1280/89mm, f/15, telescope and Sony a7iii. 4 1/30 sec exposures stacked for noise reduction. The RedCat data was upscaled and rotated to match the data from the Questar. Dynamic range was allocated to show the twilight blue sky color, the cromosphere and inner corona, mid corona to 2 solar radia, and the bright prominences clearly. Thin high clouds prevented a good rendering of the outer corona.

The full size image is linked to the downscaled crops below:

The cropped image below shows a half dozen prominences and the chromosphere. They are shown more clearly zoomed in on the linked full size image

Rendering extreme HDR images like this involves lots of choices because prints and screens can only show about 0.1% of the range of light in the original scene. The image above was rendered to optimize visibility of the prominences and the blue color of the sky. This limited the dynamic range for the corona from above and below. The image was also more closely cropped to increase the visibility of the prominences. The unsharp masking with a radial blur to match the corona's symmetry was key to overcoming the interference from the thin clouds. A bit of HDR Multiscale transformation in PixInsight increased the corona contrast. A luminosity mask was key to bringint out the solar prominences and chromosphere.

Content created: 2024-05-19




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