Corona in visible light and SOHO EIT 19.5nm Fe XII - composed image

This is nearly the realistic view on the solar corona in visible light which could be seen if it was possible to switch off the solar photosphere radiation. The image was created from my corona image in which the part hidden by the Moon was replaced by SOHO EIT 19.5nm image. Smooth transition between both images makes the boundary between eclipse image and SOHO EIT image nearly invisible. The photosphere (temperature 5 780 K) being compared to corona (temperature over 1 000 000 K) is black in wavelength of 19.5 nm and therefore no eclipse is necessary for corona observing. Even if there is big difference in wavelengths used for taking both images there is very high similarity in appearance of corona on these images.

Date11. 08. 1999
TimeSecond contact 10:50:37 UT, third contact 10:53:00 UT
SOHO EIT image 11:08:16 UT
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
Resolution6.53 arc sec / pixel (image on this Web page)
FilmFujicolor Superia 800
ProcessingComposition of 21 images processed by means of Corona 3.0 merged to SOHO EIT image.
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 efz19990811.110816
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