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Determining the Origin of Tidal Oscillations in the Ionospheric Transition Region With EISCAT Radar and Global Simulation Data

Günzkofer, Florian Ludwig and Pokhotelov, Dimitry and Stober, Gunter and Liu, Huixin and Liu, Hanli and Mitchell, Nicholas and Tjulin, Anders and Borries, Claudia (2022) Determining the Origin of Tidal Oscillations in the Ionospheric Transition Region With EISCAT Radar and Global Simulation Data. Journal of Geophysical Research: Space Physics. Wiley. doi: 10.1029/2022JA030861. ISSN 2169-9380.

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Official URL: https://doi.org/10.1029/2022JA030861


At high-latitudes, diurnal and semidiurnal variations of temperature and neutral wind velocity can originate both in the lower atmosphere (UV or infrared absorption) and in the thermosphere-ionosphere (ion convection, EUV absorption). Determining the relative impact of different forcing mechanisms gives insight to the vertical coupling in the ionosphere. We analyze measurements from the incoherent scatter radar (ISR) facility operated by the EISCAT Scientific Association. They are complemented by meteor radar data and compared to global circulation models. The amplitudes and phases of tidal oscillations are determined by an adaptive spectral filter (ASF). Measurements indicate the existence of strong semidiurnal oscillations in a two-band structure at altitudes <110 and >130 km, respectively. Analysis of several model runs with different input settings suggest the upper band to be forced in situ while the lower band corresponds to upward-propagating tides from the lower atmosphere. This indicates the existence of an unexpectedly strong, in situ forcing mechanism for semidiurnal oscillations in the high-latitude thermosphere. It is shown that the actual transition of tides in the altitude region between 90 and 150 km is more complex than described so far.

Item URL in elib:https://elib.dlr.de/188660/
Document Type:Article
Title:Determining the Origin of Tidal Oscillations in the Ionospheric Transition Region With EISCAT Radar and Global Simulation Data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Günzkofer, Florian LudwigUNSPECIFIEDhttps://orcid.org/0000-0001-6568-2995UNSPECIFIED
Pokhotelov, DimitryUNSPECIFIEDhttps://orcid.org/0000-0002-3712-0597UNSPECIFIED
Stober, GunterInstitute of Applied Physics & Oeschger Center for Climate Change Research, Microwave Physics, University of Bern, Bern, Switzerlandhttps://orcid.org/0000-0002-7909-6345UNSPECIFIED
Liu, HuixinUNSPECIFIEDhttps://orcid.org/0000-0001-7073-4366UNSPECIFIED
Mitchell, NicholasUniversity of Bath, Bath, United KingdomUNSPECIFIEDUNSPECIFIED
Tjulin, AndersEISCAT Scientific AssociationUNSPECIFIEDUNSPECIFIED
Borries, ClaudiaUNSPECIFIEDhttps://orcid.org/0000-0001-9948-3353UNSPECIFIED
Date:September 2022
Journal or Publication Title:Journal of Geophysical Research: Space Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Ionospheric tides, Incoherent Scatter Radar, Thermosphere-Ionosphere coupling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Solar-Terrestrial Physics SO
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Solar-Terrestrial Coupling Processes
Deposited By: Günzkofer, Florian Ludwig
Deposited On:05 Oct 2022 14:34
Last Modified:28 Feb 2023 14:45

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