The third contact
These two images are a rather complicated composition of four images with various exposures taken near
the third contact. The image of chromosphere taken with 1/500 s exposure (left) and the image of
Baily's beads taken with 1/1000 s exposure (right) both have underexposed parts with no
information. These parts were reconstructed using two images with longer exposures taken several
seconds before. This reconstruction has no influence to the correctly exposed parts of images. Images
were registered with high accuracy which enabled to enhance fine structure of prominences.
Click on the following reference to display the same
image in the maximum quality (815 KB, PNG format).
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Image | 1999f_3con.jpg |
Date | 11. 08. 1999 |
Time | 10:23:28 - 10:23:48 UT (all used exposures are in this interval) |
Place | France, between Amiens and Beauvais, about 100 km northern from Paris. |
Coordinate | N 49° 38', E 2° 09' |
Conditions | Thin high clouds |
Optics | Refractor Zeiss AS100/1000 mm with teleconverter 1.5× |
Film | Kodak Elite chrome 200 |
Exposure | 1/125 s - 1/1000 s |
Processing | Selective composition of four images, contrast on high frequencies improved Image processing Miloslav Druckmüller |
Scanner | Nikon LS-2000 |
Software | Sofo ACC 5.0 Scientific Image Analyzer with Match II Module (final processing) PhaseCorr 2.0 Analyzer (rotation estimation for registration of images) |
Orientation | The image must be rotated 20.51° clockwise to achieve the standard orientation (N top, E left) in heliocentric coordinate system |
Copyright | © 1999 Libor Šmíd, © 2004 Miloslav Druckmüller |
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Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
druckmuller@fme.vutbr.cz
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Page last update: 27.11.2019
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