Image

Corona and SOHO EIT composed image

Total solar eclipse gives us an unique opportunity to observe the solar corona but the phenomenon is extremely short and rare. During the eclipse we are able to obtain an image of the solar corona unfortunately only from one direction and therefore it is very difficult to understand the 3D coronal structure. Images like the image on this page may improve our understanding of the coronal features spatial distribution. In order to visualize, in the understandable way, the part of corona hidden by the Moon I have created a pseudocolor image from a pair of SOHO EIT images. The hot corona is displayed on the 19.5 nm image and I colored it using the blue-white color near to the appearance of the solar corona during the eclipse on the blue sky. The lower and colder gas layer displayed on the 30.4 nm image I colored using the orange hue. I obtained the image in which the transparent holes in corona are orange. The dense parts of hot corona are of the blue-white color, which corresponds the appearance in visible light.

ImageEcl1998_eit_195_304c1.png
Date26. 2. 1998
Time2nd contact 18:04:55 UT, 3rd contact 18:08:45 UT
PlaceVenezuela, Don Bosco Mission near Maracaibo
Coordinate11° 03' 52'' N, 72° 03' 05'' W
ConditionsClear sky - the weather was nearly hopeless but the sky cleared just before eclipse. Altitude of the Sun was 65° above the horizon.
OpticsRubinnar 5.6/500mm
Resolution9.39 arc sec / pixel (image on this Web page)
FilmFujicolor Superia 200, 24×36mm
ProcessingComposition of 15 images. Images were aligned by means of phase correlation technique (PhaseCorr 3.0) and then processed using Corona 3.0 software by means of adaptive kernel convolution. Final processing done in ACC 6.0.
Image processing by Miloslav Druckmüller
ScannerNikon Super Coolscan 4000 ED (16x multisample, 4000 dpi)
SoftwarePhaseCorr 3.0, Corona 3.0, Sofo ACC 6.0
OrientationThe image must be rotated 20.3° anticlockwise to achieve the standard orientation i.e. North top,East left
Copyright©1998 Úpice observatory and Vojtech Rušin © 2004 Miloslav Druckmüller
 

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
druckmuller@fme.vutbr.cz
Page last update: 27.11.2019