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  Initial results of short-wavelength infrared imaging spectrograph and monochromatic imager, NIRAS-2 and NIRAC, installed at KHO/UNIS, Longyearbyen, Svalbard (78.1°N, 16.0°E)

Nishiyama, T., Kagatani, M., Furutachi, S., Ogawa, Y., Tsuda, T., Iwasa, Y., Tsuchiya, F., Dalin, P., Nozawa, S., Sigernes, F. (2023): Initial results of short-wavelength infrared imaging spectrograph and monochromatic imager, NIRAS-2 and NIRAC, installed at KHO/UNIS, Longyearbyen, Svalbard (78.1°N, 16.0°E), XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1388

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017213 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017213_3
Genre: Conference Paper

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 Creators:
Nishiyama, Takanori1, Author
Kagatani, Masato1, Author
Furutachi, Senri1, Author
Ogawa, Yasunobu1, Author
Tsuda, Takuo1, Author
Iwasa, Yuki1, Author
Tsuchiya, Fuminori1, Author
Dalin, Peter1, Author
Nozawa, Satonori1, Author
Sigernes, Fred1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: A new ground-based optical observation of aurora and airglow in short-wavelength infrared (SWIR) of 1.05-1.35 μm has been initiated at The Kjell Henriksen Observatory (KHO), Longyearbyen (78.1°N, 16.0°E) since November 2022. Two state-of-the-art instruments, a SWIR imaging spectrograph and a monochromatic imager, are being operated to focus on study on dayside magnetosphere-ionosphere-atmosphere coupling processes in the high polar regions.The 2-D imaging spectrograph, NIRAS-2, measures SWIR auroral emissions such as N2+ Meinel band (0,0), N2 1st Positive bands (0,1), and OI- line with time resolution of 30 seconds. Using high spectral resolution mode, N2+ ion rotational temperature would be estimated. For upper mesosphere, OH (8,5) band was measured and its rotational temperature can be estimated with10-min resolutions and errors less than 5 K. In addition, one more important thing is that this OH emission band is almost completely uncontaminated by aurora. On the other hand, the brand-new SWIR camera, NIRAC, can visualize two-dimensional structures of not only aurora (N2+) but also even weak airglow (OH) with a cadence of less than 30 seconds. This is the monochromatic imaging of SWIR aurora for the first time so far, and the NIRAC is used as a twin instrument to the NIRAS-2 to help in interpreting meridional scan data obtained from the NIRAS-2. Taking geographical advantage of the observatory, 24-hours continuous observations can be expected near the winter solstice. Initial results of NIRAS-2 and NIRAC are presented and then we will discuss the observational strategies and future collaborations.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1388
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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