Bolton Astronomical Society

More solar imaging
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Author:  rwilkinson [ Sun Sep 11, 2016 3:46 pm ]
Post subject:  More solar imaging

This morning I spotted a large solar prominence through my Lunt solar-scope, so this afternoon I had a go at imaging it (with an old Philips mono webcam).
It was tricky to catch a long enough gap in the clouds to capture a pair of image-sequences (one at low gain, to get the detail on the disk and then one with a higher gain for the fainter prominence), but I did manage it twice within an hour and a half.
And it's interesting to see how much the view had changed over that interval:
File comment: The prominence at 2:15pm
sun_11sep_1315.jpg [ 131.07 KiB | Viewed 2619 times ]
File comment: Another view from 3:30pm
sun_11sep_1430.jpg [ 118.82 KiB | Viewed 2619 times ]

Author:  rwilkinson [ Sun Jul 09, 2017 3:40 pm ]
Post subject:  Re: More solar imaging

On the few occasions this year that I've set up my Lunt solar telescope, the solar activity has been very sparse. :(

However this weekend I saw an active sunspot group plus a large prominence, so I plugged in an old Philips webcam to try some imaging.
I captured two sets of 400 frames (1/2500-sec for the disk detail and 1/500 for the fainter prominence), and stacked each using the AutoStakkert program.
Then for a change I used the ImageJ program, which can read the 32-bit FITS files directly and is much better for overlaying (rather than adding) a pair of images than IRIS.
File comment: Solar activity on 9-July-2017. From 800 frames using Philips (mono) TouCam on Lunt 35S.
sun_20170709_1447.png [ 307.58 KiB | Viewed 1710 times ]

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