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  The origin of semidiurnal neutral wind oscillations in the high-latitude ionospheric dynamo region

Günzkofer, F., Pokhotelov, D., Stober, G., Liu, H., Liu, H., Mitchell, N. J., Tjulin, A., Borries, C. (2023): The origin of semidiurnal neutral wind oscillations in the high-latitude ionospheric dynamo region, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2920

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018962 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018962_1
Genre: Conference Paper

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 Creators:
Günzkofer, Florian1, Author
Pokhotelov, Dimitry1, Author
Stober, Gunter1, Author
Liu, Huixin1, Author
Liu, Hanli1, Author
Mitchell, Nicholas J.1, Author
Tjulin, Anders1, Author
Borries, Claudia1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Tidal wind oscillations in the high-latitude ionospheric dynamo/transition region can be in situ forced or propagate there from lower atmospheric layers. Investigating the complex mixing of tidal modes allows determining the solar, geomagnetic, and atmospheric impact on the transition region dynamics. In classical tidal theory at high latitudes, semidiurnal tides forced by UV and IR absorption in lower atmospheric regions propagate upwards and are the dominant tidal mode up to about 120 km. Above, diurnal modes forced in situ by EUV absorption and ion drag due to the polar plasma convection are assumed dominant. We analyze a 22-day-long measurement campaign with the EISCAT UHF incoherent scatter radar during September 2005. The beam-swinging experiment allows for obtaining neutral winds from 96 - 142 km altitude which are combined with simultaneous Kiruna meteor radar measurements. An Adaptive Spectral Filtering technique is applied to determine tidal amplitudes and phases. The zonal wind showed the expected transition from semidiurnal to diurnal oscillations at about 120 km. The meridional wind showed a more complex structure with dominant 12h oscillations below 110 km and above 130 km. General Circulation Model runs with different forcing settings are analyzed to determine the origin of these high-altitude semidiurnal oscillations. The measured asymmetry of tidal amplitudes in zonal and meridional winds is found in all investigated model runs. It is shown that at high latitudes, atmospheric tides do not influence semidiurnal oscillations above 120 km. The polar ion convection and EUV absorption both contribute to the observed high-altitude semidiurnal oscillations.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-2920
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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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