Fe XI, 789.2 nm
The full resolution image you may download here.
Following two unprocessed images illustrate that the on-band image which contains Fe XI emission is highly
contaminated by continuum. The left image was taken through a narrow band filter (bandwidth 1 nm)
with a transmission band centered on the Fe XI 789.2 nm emission line. The right image was taken
through a filter with transmission band outside the Fe XI line in the continuum. It is clearly
visible that the left image is highly contaminated by continuum irradiance. It is necessary to make a
precise photometric calibration of all images and then subtract the continuum - the right image from
the left one. You may see these two images as an
animation .
Click on the image or on the following reference to display the
higher resolution image version (956 KB, PNG format).
|
| Image | TSE_2026_FeXI.png |
| Date | 12. 08. 2026 |
| Time | 2nd contact 18:28:19 UT, 3rd contact 18:30:07 UT (duration 106 s) |
| Place | Padilla de Bajo, Spain |
| Coordinate | N 42° 24.324' W 4° 10.590' Alt. 800 m |
| Conditions | Clear sky, solar altitude 7-8° above horizon |
| Optics | 2× Zeiss Tele-Tessar 4/300 mm equipped with following narrow band filters:
on-band filter: Alluxa, center wavelength 789.2 nm, bandwidth 1 nm
off-band filter: Alluxa, center wavelength 782.2 nm, bandwidth 1 nm |
| Camera | 2× ZWO ASI1600MM Pro |
| Exposure | 0.01 s - 3.2 s |
| Processing | Composition of 66 eclipse images (33 on-band and 33 off-band). 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, continuum was removed from Fe XI emission by subtracting the off-band images. The resulting image was processed using Corona 5.0 software in order to visualize coronal structures. The final processing was done using ACC 6.1 software.
Image processing by Miloslav Druckmüller |
| Software | PhaseCorr 8.0, LDIC 6.0, Corona 5.0, Sofo ACC 6.1 |
| Orientation | Image has Solar North on top orientation |
| Copyright | © 2026 Miloslav Druckmüller, Shadia Habbal, Matěj Štarha |
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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: 3.11.2026
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