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https://doi.org/10.5194/egusphere-2022-593
https://doi.org/10.5194/egusphere-2022-593
06 Jul 2022
 | 06 Jul 2022

Mid-Latitude Neutral Wind Responses to Sub-Auroral Polarization Streams

Daniel D. Billett, Kathryn A. McWilliams, Robert B. Kerr, Jonathan J. Makela, Alex T. Chartier, John M. Ruohoniemi, Sudha Kapali, Mike A. Migliozzi, and Juanita Riccobono

Abstract. We investigate the response of the mid-latitude thermospheric neutral winds to a sub-auroral polarisation stream (SAPS) event. Using red-line (F-region) airglow data from two Fabry-Perot interferometers (FPIs), and F-region ionospheric flow velocities from four Super Dual Auroral Radar Network (SuperDARN) radars, the drivers behind changes seen in the neutral winds are explored within the context of the larger SAPS structure. Different, although strong, neutral wind responses to the SAPS are seen at the two FPI sites, even though they are relatively close geographically. We attribute the wind differences to the varying balance of pressure gradient, ion-drag, and Coriolis forces, which ultimately depend on proximity to the SAPS. At the FPI site equatorward of the SAPS, pressure-gradient and Coriolis forces drive the winds equatorward and then westward. At the FPI site co-located with the SAPS, ion-drag is strong and results in the winds surging westward, before turning eastward when becoming influenced by dawnside sunward plasma convection drifts.

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Journal article(s) based on this preprint

28 Sep 2022
Mid-latitude neutral wind responses to sub-auroral polarization streams
Daniel D. Billett, Kathryn A. McWilliams, Robert B. Kerr, Jonathan J. Makela, Alex T. Chartier, J. Michael Ruohoniemi, Sudha Kapali, Mike A. Migliozzi, and Juanita Riccobono
Ann. Geophys., 40, 571–583, https://doi.org/10.5194/angeo-40-571-2022,https://doi.org/10.5194/angeo-40-571-2022, 2022
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Sub-Auroral Polarisation Stream (SAPS) are very fast plasma flows that occur at...
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