Solar corona

This image is made from 21 images taken with two different cameras on color negative film. Excellent observing conditions and the Sun not far from the zenith enabled to create an image of very good quality. The faintest star visible in the image is of magnitude 6.2.

Click on the image or on the following reference to display the higher resolution image version (1.2 MB, PNG format).

Date11. 07. 1991
Time2nd contact 18:47:52 UT, 3rd contact 18:54:23 UT
Total eclipse duration: 6 min 30 sec
PlaceLa Paz (university), Baja California, Mexico
Coordinate110.31° W, 24.14°N
ConditionsExcellent, clear sky, altitude of the Sun above the horizon: 82°
Optics(1) 500 mm focal length
(2) 80mm Zeiss AS refractor with 2× converter, total FL=2400mm
Film(1) Kodak Vericolor III Professional Type S, 24×36 mm film, (Kodak 5026 VPS)
(2) Kodak Vericolor III Professional Type S, 6×6 cm film, (Kodak VPS 6006)
ProcessingComposition of 21 images, (1) 13 images 24×36 mm, (2) 8 images 6×6 cm. Images were aligned by means of phase correlation, composed by means of FilmCMP 2.0 software, processed using Corona 4.1 in order to visualize coronal structures. Final processing was done using ACC 6.1 software.
Image processing by Miloslav Druckmüller
ScannerNikon Super Coolscan 4000 ED
SoftwarePhaseCorr 6.0, FilmCMP 2.0, Corona 4.1, Sofo ACC 6.1
NoteThe graph above the table shows the average values of the relative number of sunspots in which the red arrow indicates the time of 1991 eclipse. Graph was created according to data from Sunspot Index Data Center, Brussels.
OrientationImage must be rotated 92.7° anti-clockwise to achieve standard orientation i. e. solar North up.
Copyright©1991 Peter Aniol, ©2010 Miloslav Druckmüller

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 11.4.2010