The Sun in October 2014

Blog the previous nights viewing. Link to images on the gallery or simply describe what you observed the night before. Leave the technical and howto in another forum.
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rwilkinson
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The Sun in October 2014

#1 Post by rwilkinson » Sun Oct 05, 2014 3:54 pm

This afternoon I took a break from gardening to have a look at the Sun through our H-alpha telescope. I could see a few filaments and one very large prominence, so I had a go at capturing an image through the hazy cloud with our webcam:
sun_5oct.jpg
Solar image from 5-Oct-2014, taken with BAS Trust webcam and Coronado SM60. It's only just possible to fit the whole disk onto the webcam chip!
sun_5oct.jpg (236.15 KiB) Viewed 2630 times
As the 8-bit camera has a limited dynamic range (only 256 levels), I needed to record a pair of 250-frame .AVI sequences: one with the camera gain set low to capture the detail on the disk and the other in high-gain mode to get the faint prominences.
disk.jpg
Processed image of solar disk, with camera in low-gain mode.
disk.jpg (57.34 KiB) Viewed 2622 times
rim.jpg
Processed image of solar prominences, with camera in high-gain mode
rim.jpg (24.3 KiB) Viewed 2622 times
I'd used the camera in monochrome mode, so in IRIS I loaded the disk image into the Green field and the prominences into the Red (and turned off the Blue) to get this "creme brule" colour effect.

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