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• W2884959549 startingPage "7051" @default.
• W2884959549 abstract "Abstract Our aim is to understand the effect of high‐speed stream events on the high‐latitude ionosphere and more specifically the decrease of the f o F 2 frequency during the entire day following the impact. First, we have selected one summertime event, for which a large data set was available: Super Dual Auroral Radar Network (SuperDARN) and European Incoherent SCATter (EISCAT) radars, Tromsø and Sodankylä ionosondes, and the CHAllenging Minisatellite Payload (CHAMP) satellite. We modeled with the IPIM model (IRAP Plasmasphere Ionosphere Model) the dynamics of the ionosphere at Tromsø and Sodankylä using inputs derived from the data. The simulations nicely match the measurements made by the EISCAT radar and the ionosondes, and we showed that the decrease of f o F 2 is associated with a transition from F 2 to F 1 layer resulting from a decrease of neutral atomic oxygen concentration. Modeling showed that electrodynamics can explain short‐term behavior on the scale of a few hours, but long‐term behavior on the scale of a few days results from the perturbation induced in the atmosphere. Enhancement of convection is responsible for a sharp increase of the ion temperature by Joule heating, leading through chemistry to an immediate reduction of the F 2 layer. Then, ion drag on neutrals is responsible for a rapid heating and expansion of the thermosphere. This expansion affects atomic oxygen through nonthermal upward flow, which results in a decrease of its concentration and amplifies the decrease of [O]/[N 2 ] ratio. This thermospheric change explains long‐term extinction of the F 2 layer." @default.
• W2884959549 created "2018-08-03" @default.
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• W2884959549 date "2018-08-01" @default.
• W2884959549 modified "2023-10-02" @default.
• W2884959549 title "IPIM Modeling of the Ionospheric<i>F</i>₂Layer Depletion at High Latitudes During a High-Speed Stream Event" @default.
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• W2884959549 doi "https://doi.org/10.1029/2018ja025744" @default.
• W2884959549 hasPublicationYear "2018" @default.
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