6. 8. 2013, 22:01 UT
Red sprites are optical phenomena which occur above active thunderstorms. It seems that they are
correlated with positive cloud-to-ground (CG) lightning discharge (only 10 % of all lightnings are
positive CG, the majority are negative ones). Red sprites appear very high above thunderstorms in
altitudes from about 30 to 90 km. The brightest part of a red sprite is
typically located between 50 and 75 km above the ground and its duration is only a few milliseconds.
The red color is mainly caused by the excitation of molecular nitrogen. There are several theories
explaining the red sprites however the phenomenon is not fully understood yet. The exact position
of the red sprite in the sky is shown in this star map generated
by the Sky Charts software.
Here are some more images made from the same data as the image on this page:
- B&W image with subtracted stars showing the red channel only
(without noise filtration)
- High contrast LRGB image with subtracted stars where L=R
(without L noise filtration, color noise filtered)
- LRGB image where L=R
(L noise partially filtered, color noise filtered)
Click on the image or on the following reference to display the
higher resolution image version (1.2 MB, PNG format).
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| Image | HN3A0642.png |
| Date | 6. 8. 2013 |
| Time | 22:01:40 - 22:01:46 UT (time according to GPS) |
| Place | Střítež, Bohemian-Moravian Highlands, Czech Republic |
| Coordinate | N 49° 26' 13.114", E 16° 15' 41.051", Alt. 580 m |
| Optics | Pentacon 1.8/50mm (set to F 2.0) |
| Camera | Canon EOS 1D Mark II |
| Exposure | 6 s, ISO 3200 |
| Processing | Images taken by Pavel Štarha, image processing by Miloslav Druckmüller |
| Copyright | © 2013 Pavel Štarha, Miloslav Druckmüller |
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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: 16.8.2013
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