Image #44, basic processing [23 kB]
Download this image in fits [46 kB] format.
These images were obtained with Ealing bandpass filter of 40 nm FWHM at f/45 with the SVST. Detector was a Kodak Megaplus 1.6 10-bit CCD with no cooling. Pixel scale 0.08 arcsecs.
This daylight sequence was obtained at an eastern elongation 21.2 degrees, using 450 nm to 940 nm filters. 185 images were software-selected and saved in real-time, of which 65 were considered sharp enough to process further. Processing sequences of three detailed images are shown below.
The first image is after flatfielding (flatfields obtained during imaging sequence). Second image is after fourier filtration with a Wiener filter constructed from frequency information of the flat- and dark-corrected image. Third image is result after further application of unsharp mask with amplification factor of 1.6 and filter size 5x5 pixels.
Hermeographic N is towards the upper cusp, E towards the limb. Classical features like the bright region Liguria and dark regions Solitudo Phoenicis, Solitudo Helii and Solitudo Atlantis may be identified.
Observations by J. Warell and K. Muinonen, image processing by J. Warell. Please note that image quality is superior in the fits versions.
650 nm filter, UT 15:33, 180 ms exposure time. Mercury alt. 33 deg, sun alt. 28 deg.
Image #44, basic processing [23 kB]
Download this image in fits [46 kB] format.
Download this image in fits [49 kB] format.
Image #44, unsharp masking [18 kB]
Download this image in fits [49 kB] format.
830 nm filter (not 940 nm as stated in fits header), UT 15:48, 180 ms exposure time. Mercury alt. 32 deg, sun alt. 25 deg.
Image #111, basic processing [23 kB]
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Image #111, Wiener filtering [18 kB]
Download this image in fits [49 kB] format.
Image #111, unsharp masking [18 kB]
Download this image in fits [49 kB] format.
550 nm filter, UT 17:14, 200 ms exposure time. Mercury alt. 22 deg, sun alt. 11 deg.
Image #195, basic processing [24 kB]
Image #195, Wiener filtering [18 kB]
Download this image in fits [49 kB] format.
Image #195, unsharp masking [19 kB]
Download this image in fits [49 kB] format.
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