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| Titel |
The red-sky enigma over Svalbard in December 2002 |
| VerfasserIn |
F. Sigernes, N. Lloyd, D. A. Lorentzen, R. Neuber, U.-P. Hoppe, D. Degenstein, N. Shumilov, J. Moen, Y. Gjessing, O. Havnes, A. Skartveit, E. Raustein, J. B. Ørbæk, C. S. Deehr |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 5 ; Nr. 23, no. 5 (2005-07-27), S.1593-1602 |
| Datensatznummer |
250015249
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1593-2005.pdf |
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| Zusammenfassung |
On 6 December 2002, during winter darkness, an extraordinary event occurred
in the sky, as viewed from Longyearbyen (78° N, 15° E), Svalbard,
Norway. At 07:30 UT the southeast sky was surprisingly lit up in a deep
red colour. The light increased in intensity and spread out across the sky,
and at 10:00 UT the illumination was observed to reach the zenith. The event
died out at about 12:30 UT. Spectral measurements from the Auroral Station
in Adventdalen confirm that the light was scattered sunlight. Even though
the Sun was between 11.8 and 14.6deg below the horizon during the
event, the measured intensities of scattered light on the southern horizon
from the scanning photometers coincided with the rise and setting of the
Sun. Calculations of actual heights, including refraction and atmospheric
screening, indicate that the event most likely was scattered solar light from
a target below the horizon. This is also confirmed by the OSIRIS instrument
on board the Odin satellite. The deduced height profile indicates that the
scattering target is located 18–23km up in the stratosphere at a latitude
close to 73–75° N, southeast of Longyearbyen. The temperatures in
this region were found to be low enough for Polar Stratospheric Clouds (PSC)
to be formed. The target was also identified as PSC by the LIDAR systems at
the Koldewey Station in Ny-Ålesund (79° N, 12° E). The event
was most likely caused by solar illuminated type II Polar Stratospheric Clouds
that scattered light towards Svalbard. Two types of scenarios are presented
to explain how light is scattered.
Keywords. Atmospheric composition and structure (Transmissions
and scattering of radiation; Middle atmospherecomposition
and chemistry; Instruments and techniques) –
History of geophysics (Atmospheric Sciences; The red-sky
phenomena) |
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