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| Titel |
Small-scale wavelike structures in the Alpine Region observed in OH-Airglow - Comparison of measurements at Oberpfaffenhofen, Germany and Sonnblick, Austria |
| VerfasserIn |
Patrick Hannawald, René Sedlak, Carsten Schmidt, Sabine Wüst, Michael Bittner |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148523
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| Publikation (Nr.) |
 EGU/EGU2017-12786.pdf |
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| Zusammenfassung |
| The OH-airglow layer in about 87 km altitude is well-suited for the investigation of atmospheric dynamics, allowing continuous observations of the night-sky throughout the year. Especially, atmospheric gravity waves are prominent features in the data of airglow imaging systems.
Our system FAIM 1 (Fast Airglow IMager 1) focusses on small-scale wave-like structures in the range of 1 km to 30 km with a spatial resolution of about 200m at mesopause heights and a FOV of about 20° to 25°. Covering the brightest OH vibrational bands between 1.0 µm and 1.7 µm, a temporal resolution of 2 frames per second is acquired. The instrumental setup is designed to cover small-scale gravity waves as well as larger scale instability structures.
The instrument FAIM 1 is operational since 2014 as part of the Virtual Alpine Observatory program (VAO). For the first 1.5 years it was placed at Oberpfaffenhofen, Germany, afterwards it has been set-up at Sonnblick Observatory, Austria. This currently provides about 3 years of data at two sites. The two-dimensional FFT is used for the extraction of horizontal wavelengths and propagation directions from the images. Additionally, a new approach based on the so-called structure tensor is tested in order to overcome the disadvantages of the FFT. For both stations, the dominating horizontal wavelengths and propagation directions are retrieved; the similarities and differences are presented and discussed.
This work received funding from the Bavarian State Ministry of the Environment and Consumer Protection. |
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