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    Probing the Magnetospheric Generator of Quiet Electrostatic Auroral Arcs From Ground Based Optical Observations and Magnetosphere-ionosphere Coupling Modeling

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    Authors
    Echim, M.
    Lamy, H.
    Simon-Wedlund, C.
    De Keyser, J.
    Cessateur, G.
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    Discipline
    Physical sciences
    Subject
    quiet electrostatic auroral arc
    magnetosphere-ionosphere coupling
    magnetospheric generator
    Audience
    Scientific
    Date
    2023
    Metadata
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    Description
    Observations of a quiet electrostatic auroral arc by the ALIS network on 5 March 2008 are used to infer a two-dimensional map of the flux of precipitating energy. Among a family of numerical solutions of a stationary magnetosphere—ionosphere coupling model in which the origin of the arc is a magnetospheric generator interface, we find which generator interface properties best fit the observed precipitating energy flux. The procedure finds that the plasma populations in the generator are colder and more rarefied on one side of the interface and warmer and denser on the other side, similar to a transition between plasma trough and plasma sheet plasmas. The increase of the arc's brightness, the decrease of its thickness and its slight spatial undulation may be driven by an increase of plasma sheet electron temperature in the tailward direction, tangential to the interface, and a local spatial indentation in the dawn-ward direction.
    Citation
    Echim, M.; Lamy, H.; Simon-Wedlund, C.; De Keyser, J.; Cessateur, G. (2023). Probing the Magnetospheric Generator of Quiet Electrostatic Auroral Arcs From Ground Based Optical Observations and Magnetosphere-ionosphere Coupling Modeling. , Geophysical Research Letters, Vol. 50, Issue 24, e2023GL103689, DOI: 10.1029/2023GL103689.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/11220
    doi: http://dx.doi.org/10.1029/2023GL103689
    url:
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
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