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Thermospheric wind response to a sudden ionospheric variation in the trough: event at a pseudo-breakup during geomagnetically quiet conditions
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2022 (Engelska)Ingår i: Earth Planets and Space, ISSN 1343-8832, E-ISSN 1880-5981, Vol. 74, nr 1Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The thermospheric wind response to a sudden westward turning of the ion velocity at a high latitude was studied by analyzing data obtained with a Fabry–Perot interferometer (FPI; 630 nm), Dynasonde, and Swarm A & C satellites during a conjunction event. The event occurred during a geomagnetically quiet period (Kp = 0 +) through the night, but some auroral activity occurred in the north. The collocated FPI and Dynasonde measured the thermospheric wind (U) and ionospheric plasma velocity (V), respectively, in the F region at the equatorward trough edge. A notable scientific message from this study is the possible role of thermospheric wind in the energy dissipation process at F-region altitude. The FPI thermospheric wind did not instantly follow a sudden V change due to thermospheric inertia in the F region. At a pseudo-breakup during the event, V suddenly changed direction from eastward to westward within 10 min. U was concurrently accelerated westward, but its development was more gradual than that of V, with U remaining eastward for a while after the pseudo-breakup. The delay of U is attributed to the thermospheric inertia. During this transition interval, U∙V was negative, which would result in more efficient generation of frictional heating than the positive U∙V case. The sign of U∙V, which is related to the relative directions of the neutral wind and plasma drift, is important because of its direct impact on ion-neutral energy exchange during collisions. This becomes especially important during substorm events, where rapid plasma velocity changes are common. The sign of U∙V may be used as an indicator to find the times and locations where thermospheric inertia plays a role in the energy dissipation process.

Ort, förlag, år, upplaga, sidor
2022. Vol. 74, nr 1
Nyckelord [en]
Ionosphere, Thermosphere, Ion drag, High latitude, Fabry–Perot interferometer, Aurora Pseudo-breakup
Nationell ämneskategori
Fusion, plasma och rymdfysik
Identifikatorer
URN: urn:nbn:se:polar:diva-9005DOI: 10.1186/s40623-022-01710-6OAI: oai:DiVA.org:polar-9005DiVA, id: diva2:1729083
Tillgänglig från: 2023-01-19 Skapad: 2023-01-19 Senast uppdaterad: 2023-01-19Bibliografiskt granskad

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