Corona in visible light and SOHO EIT 30.4 nm - composed image

This image is a composition of 21 different images with various exposition times processed by means of Corona 3.0 software. These images I took with MTO Maksutov - Cassegrain telescope. The part of the Sun obscured by the Moon was replaced by SOHO EIT 30.4 nm (He II) image taken at 11:14 UT. Orange color palette is used for SOHO image display in order to distinguish between both images. There is a big difference between this image and image composed with SOHO EIT 19.5 nm. While the 19.5 nm image shows coronal features the 30.4 nm image shows more features corresponding to solar chromosphere i.e. colder gas layer. Prominences, cold gas clouds in hot corona, are very well visible on 30.4 nm too, as it is illustrated on the pair of small pictures on the left. Chromosphere and prominences are not visible on polar regions on the image taken in visible light during eclipse because my observing place was nearly on the eclipse central line and for the whole eclipse they were obscured by the Moon.

Click on the image or on the following reference to display the higher resolution image version (1.7 MB, PNG format).

Date11. 08. 1999
TimeSecond contact 10:50:37 UT, third contact 10:53:00 UT
Total eclipse duration 2 min 23 s
PlaceHungary, 2 km SSE from Németkér village
CoordinateN 46° 41' 36'', E 18° 47' 14''
ConditionsExcellent, clear sky. (Solar altitude 59° above horizon)
OpticsMaksutov - Cassegrain MTO 1000a, 10.5/1084 mm
CameraSoligor SR-300MD
Resolution4.76 arc sec / pixel (higher resolution image version)
FilmFujicolor Superia 800
ProcessingComposition of 21 images processed by means of Corona 3.0 and ACC software , diffraction corrected
Image processing by Miloslav Druckmüller
ScannerNikon Super Coolscan 4000 ED (4000 dpi resolution, RGB, 3 × 16 bit/pixel, 16× multisample)
SoftwareSofo ACC 6.0 with Match II module, Corona 3.0
NoteSOHO EIT image file name efz19990811.120216
OrientationThe image must be rotated 16.7° clockwise to achieve the standard orientation i.e. North top, East left
Copyright© 1999 ESA/NASA © 2004 Miloslav Druckmüller


Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 19.3.2007