Solar corona on February 16, 1980

This image shows a very complex structure of the corona at the maximum of the solar activity cycle. The image was made of large-format glass plates of excellent quality. The focal length of the optics was over 3 m and using of coelostat enabled to obtain sharp images not influenced by vibrations. See the the negative version of the image, which shows the fine coronal structures even better than the positive one.
Click on the image or on the following reference to display the higher resolution image version (1.7 MB, PNG format).

Date16. 02. 1980
TimeSecond contact 10:12:54 UT, third contact 10:15:38 UT (observed times)
Eclipse duration 2 min 44 s
Second contact 10:12:54 UT, third contact 10:15:35 UT (calculated times)
Eclipse duration 2 min 41 s
PlaceNear Jawalgera village, Raichur District, Karnataka State, India
CoordinateN 15° 50' 57'', E 76° 52' 52'', altitude 380 m
ConditionsClear sky, windless. Altitude of the sun above the horizon: 55°
Optics200/3040 mm horizontal telescope and 300 mm Jensch coelostat
Yellow Schott GG-14 filter
FilmOrwo NP 27 (18×24 cm glass plates)
Exposure1/60 s, 1/100 s, 1/50 s, 2 s, 11 s
ProcessingComposition of 4 images (1 plate not used)
Image processing by Miloslav Druckmüller
ScannerEpson Perfection V750 Pro (6400 dpi resolution, 4× scanned each plate)
SoftwarePhaseCorr 4.0, FilmCMP 2.0, Corona 4.0, Sofo ACC 6.0
NoteThe graph above the table shows the average values of the relative number of sunspots, in which the red arrow indicates the time of 1980 eclipse. Graph was created according to data from Sunspot Index Data Center, Brussels.
OrientationThe image has standard orientation i. e. Solar N top, E left
Copyright© 1980 Slovak Academy of Sciences and Vojtech Rušin, © 2007 Miloslav Druckmüller

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 18.3.2010