Quasi 16‐Day Wave Signatures in the Interhemispheric Field Aligned Currents: A New Perspective Toward Atmosphere‐Ionosphere Coupling

Author:

Jadhav Ashish P.12ORCID,Yamazaki Yosuke2ORCID,Gurubaran S.1,Stolle Claudia2ORCID,Conte J. Federico2ORCID,Batista Paulo P.3ORCID,Buriti Ricardo A.4

Affiliation:

1. Indian Institute of Geomagnetism Navi Mumbai Maharashtra India

2. Leibniz‐Institute of Atmospheric Physics at the University of Rostock Kühlungsborn Germany

3. National Institute for Space Research (INPE) São José dos Campos Brazil

4. Federal University of Campina Grande Campina Grande Brazil

Abstract

AbstractQuasi 16‐day waves (Q16DWs) are a prominent and recurrent phenomenon in the middle atmosphere, typically observed over winter mid and high latitudes. This study investigates the intense Q16DW event during the 2018–2019 Northern Hemisphere (NH) winter, and explores its propagation in the middle atmosphere and its notable influence on the E‐region ionosphere. Long‐term geopotential height estimates of Aura Microwave Limb Sounder (MLS) reveal that the wave activity under consideration exhibited the largest amplitudes in the mesosphere for past 16 years. An analysis of wind data obtained from medium frequency (MF) and meteor radars, as well as from Modern‐Era Retrospective analysis for Research and Applications, Version 2 (MERRA‐2) reanalysis, reveals the presence of a westward‐propagating Q16DW with zonal wavenumber 1 exhibiting notable asymmetry about the equator, with the majority of the wave activity being confined to the NH. The prominently large amplitudes and vertical wavelengths of the wave suggest potential for the wave propagation to extend deep into the E‐region ionosphere. Swarm satellite observations reveal concurrent ∼16‐day oscillations in the eastward component of the geomagnetic field at low latitudes. These oscillations can be attributed to the periodic variations in interhemispheric field‐aligned currents (IHFACs). The ∼16‐day oscillations in the IHFACs are likely a consequence of asymmetric wind‐dynamo action, which is directly or indirectly associated with the Q16DW. These findings suggest that planetary waves originating in the middle atmosphere can cause interhemispheric coupling in the ionosphere.

Publisher

American Geophysical Union (AGU)

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