Solar corona, July 31, 1981

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Date31. 07. 1981
Time2nd contact 02:43:06 UT, 3rd contact 02:44:38 UT
Total eclipse duration 1 min 32 s
PlaceHelicopter airbase north of the city of Belovo in Siberia, Russia
CoordinateE 86.24°, N 54.58°
ConditionsClear sky, altitude of the sun above the horizon 35°
OpticsRefractor of 82 mm diameter, F/14
FilmKodak Ektachrome 400
Exposure1/500 s to 1 s
ProcessingComposition of 5 images. Images were aligned by means of phase correlation and enhanced by means of Corona 4.1 software. Final processing was done in Sofo ACC 6.1 software.
Image processing by Hana Druckmüllerová and Miloslav Druckmüller
ScannerNikon Super Coolscan 4000 ED
SoftwarePhaseCorr 5.0, 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 1981 eclipse. Graph was created according to data from Sunspot Index Data Center, Brussels.
OrientationThe image must be rotated approx. 175° clockwise to achieve the standard orientation i. e. North up and East left.
Copyright© 1981 Göte Flodqvist, © 2008 Hana Druckmüllerová, Miloslav Druckmüller

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 13.3.2010