Corona - SOHO EIT composite
SOHO EIT 19.5 nm images (Fe XII) are very similar,
from the structure point of view, to visible light images taken during an eclipse. It makes sense,
because in the visible light, the green line 530.3 nm (Fe XIV) is very strong and may
visualize nearly the same coronal structures as Fe XII line. Therefore I merged visible light
images with SOHO EIT 19.5 nm image to visualize the part of corona hidden by the Moon. In order
to make the image more understandable, I used 30.4 nm (He II) to show the layer laying under the
coronal structures in 19.5 nm image (Fe XII). The He II image, I colored red-orange. It
made the 3D understanding of the coronal structures nearly perfect. The only important information
which is missing is the polarity of magnetic field - i.e. orientation of power-lines. This missing
information can be found on the following image.
Click on the image or on the following reference to display the
higher resolution image version (1.3 MB, PNG format).
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Image | Ecl2005_de_eit1.jpg |
Date | 08. 04. 2005 |
Time | 2nd contact 21:15:05 UT, 3rd contact 21:15:37 UT SOHO EIT 19.5 nm image 21:23:37 UT SOHO EIT 30.4 nm image 21:29:23 UT |
Place | Pacific ocean aboard the MV Galapagos Legend (about 2100 km west from the Galapagos) |
Coordinate | 1° 19.554' S, 109° 30.190' W |
Conditions | Clear sky, altitude of the Sun above the horizon 60° |
Optics | Canon 500mm f/4 IS lens |
Camera | Canon EOS 1Ds Mark II digital camera |
Exposure | 1/2000 s - 1/15 s |
Processing | Composition of seven eclipse images and two SOHO EIT images. Eclipse images were aligned by means of phase correlation, calibrated and composed using a new, for this purpose newly developed, software LDIC 1.0, processed using Corona 3.0 in order to visualize coronal structures. Composition with SOHO images and the final processing was done using ACC 6.0 software. Image processing by Miloslav Druckmüller |
Software | PhaseCorr 3.0, LDIC 1.0, Corona 3.0, Sofo ACC 6.0 with Match II module |
Note | File names of used SOHO EIT images: efz20050408_212337 (19.5 nm Fe XII) efz20050408_212923 (30.4 nm He II) |
Orientation | The image has the standard orientation i.e. North top, East left |
More info | Original set of images |
Copyright | © 2005 Miloslav Druckmüller, Fred Espenak |
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Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
druckmuller@fme.vutbr.cz
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Page last update: 27.11.2019
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