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    Solar illumination control of ionospheric outflow above polar cap arcs

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    Authors
    Maes, L.
    Maggiolo, R.
    De Keyser, J.
    Dandouras, I.
    Fear, R.C.
    Fontaine, D.
    Haaland, S.
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    Discipline
    Physical sciences
    Subject
    Electric fields
    Ionosphere
    Ions
    Ion outflow
    Polar cap
    Polar ionospheres
    Polar wind
    Solar illumination
    Ionospheric measurement
    atmospheric electricity
    electric field
    flux measurement
    ionosphere
    magnetic field
    spacecraft
    zenith angle
    Audience
    Scientific
    Date
    2015
    Metadata
    Show full item record
    Description
    We measure the flux density, composition, and energy of outflowing ions above the polar cap, accelerated by quasi-static electric fields parallel to the magnetic field and associated with polar cap arcs, using Cluster. Mapping the spacecraft position to its ionospheric foot point, we analyze the dependence of these parameters on the solar zenith angle (SZA). We find a clear transition at SZA between ∼94° and ∼107°, with the O+ flux higher above the sunlit ionosphere. This dependence on the illumination of the local ionosphere indicates that significant O+ upflow occurs locally above the polar ionosphere. The same is found for H+, but to a lesser extent. This effect can result in a seasonal variation of the total ion upflow from the polar ionosphere. Furthermore, we show that low-magnitude field-aligned potential drops are preferentially observed above the sunlit ionosphere, suggesting a feedback effect of ionospheric conductivity.
    Citation
    Maes, L.; Maggiolo, R.; De Keyser, J.; Dandouras, I.; Fear, R.C.; Fontaine, D.; Haaland, S. (2015). Solar illumination control of ionospheric outflow above polar cap arcs. , Geophysical Research Letters, Vol. 42, Issue 5, 1304-1311, DOI: 10.1002/2014GL062972.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/2780
    doi: http://dx.doi.org/10.1002/2014GL062972
    scopus: 2-s2.0-84925799576
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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