Solar corona during 19 s long total solar eclipse

This image illustrates that even during 19 seconds long total solar eclipse it is possible to obtain data which are good enough for creation of very high quality image of solar corona. This image shows amazing maximum solar corona which is very different from corona during 2008, 2009 and 2010 eclipses. The Sun was only 17.5° above the horizon and observing conditions were not absolutely perfect which is visible in the image. Very thin high clouds caused very faint bands. The images used for resulting image creation were taken with 3 different cameras equipped with Maksutov-Cassegrain optics.

Click on the image or on the following reference to display the higher resolution image version (2.2 MB, PNG format).

Date3. 11. 2013
Time2nd contact 14:22:18 UT, 3rd contact 14:22:37 UT
Total eclipse duration 19 s
PlacePokwero, Uganda
CoordinateN 2° 33' 21.24",   E 31° 23' 59.10",  Alt. 640 m
Conditionsvery faint high clouds
Optics(1) Rubinar 10/1000mm,  (2,3) 3M-5CA 8/500mm
Camera(1) Canon EOS 6D (ISO 250),  (2,3) Canon 350D (ISO 100)
Exposure(1) 1/500 s,  (2) 1/30 s, 1/15 s, 1/8 s,  (3) 1/4 s, 1/2 s, 1 s
ProcessingComposition of 22 eclipse images. Eclipse images were calibrated by means of large number of dark frames and flat-fields, aligned by means of phase correlation, composed by means of LDIC 5.0 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
SoftwareAstro D3F 2.0, PhaseCorr 6.0, MPA 1.0, LDIC 6.0, 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 line indicates the time of 2013 eclipse. The data from the World Data Center for the sunspot index, (Solar Influences Data Analysis Center, the Royal Observatory of Belgium) were used.
OrientationImage must be rotated 17.7° clockwise to achieve standard orientation i. e. solar North up.
Copyright© 2013 Petr Horálek - Úpice observatory, Jan Sládeček, Miloslav Druckmüller

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 6.1.2014