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

• Main Authors: Günzkofer, Florian, Pokhotelov, Dimitry, Stober, Gunter, Liu, Huixin, Liu, Hanli, Mitchell, Nicholas J., Tjulin, Anders, Borries, Claudia
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Kiruna; EISCAT
• Online Access: https://dx.doi.org/10.57757/iugg23-2920; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018962

<!--!introduction!--> 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 ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...