Corona in white light, Fe X and Fe XIV
We have been using narrow band filters for observing iron ions in the solar corona since 2006. Bad
weather in Chile and impossibility of travelling to Argentina because of corona virus pandemic caused
that we do not have any narrow band data. However it is possible to obtain some approximate
qualitative information about distribution of Fe X and Fe XIV ions in the innermost solar
corona even using color camera only. It is possible to enhance subtle color variations by means of
precise image processing. This image processing consists of subtracting the sky background (Rayleigh
scattering of sunlight in Earth atmosphere) and increasing of color saturation about 400×. The
green color is caused by Fe XIV radiation and the red one is caused by Fe X (except of
prominences).
Click on the image or on the following reference to display the
higher resolution image version (4.5 MB, PNG format).
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| Image | TSE_2020_400mm_dm_Fe-enh-N-top.jpg |
| Date | 14. 12. 2020 |
| Time | 2nd contact 16:07:59 UT, 3rd contact 16:10:04 UT |
| Place | Fortin Nogueira, Neuquen, Argentina |
| Coordinate | S 39° 57.680', W 69° 59.576', Alt. 485 m |
| Conditions | Clear sky for 85 s of totality otherwise thin clouds
Solar altitude at mid-eclipse 72.4° above horizon |
| Optics | Nikkor 80-400mm 1:4.5-5.6G ED VR (set to FL 400 mm, F5.6) |
| Camera | Nikon Z6 |
| Exposure | 1/640 s - 3 s, ISO 100 |
| Processing | Composition of 55 eclipse images. Eclipse images were calibrated by means of dark frames and flat-fields, aligned by means of phase correlation, composed by means of LDIC 6.0 software, processed using Corona 6.0 in order to visualize coronal structures. Final processing was done using ACC 6.1 software.
Image processing by Miloslav Druckmüller
Eclipse images acquired by Andreas Möller |
| Software | Astro D3F 2.0, PhaseCorr 7.0, LDIC 6.0, Corona 6.0, Sofo ACC 6.1 |
| Orientation | This image has exact solar North on the top orientation |
| Copyright | © 2020 Miloslav Druckmüller, Andreas Möller |
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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: 30.1.2021
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