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    Solar Illumination Control of the Polar Wind

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    Authors
    Maes, L.
    Maggiolo, R.
    De Keyser, J.
    André, M.
    Eriksson, A.I.
    Haaland, S.
    Li, K.
    Poedts, S.
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    Discipline
    Physical sciences
    Subject
    low-energy ions
    ion outflow
    polar wind
    magnetosphere
    solar illumination
    ionosphere
    Audience
    Scientific
    Date
    2017
    Metadata
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    Description
    Polar wind outflow is an important process through which the ionosphere supplies plasma to the magnetosphere. The main source of energy driving the polar wind is solar illumination of the ionosphere. As a result, many studies have found a relation between polar wind flux densities and solar EUV intensity, but less is known about their relation to the solar zenith angle at the ionospheric origin, certainly at higher altitudes. The low energy of the outflowing particles and spacecraft charging means it is very difficult to measure the polar wind at high altitudes. We take advantage of an alternative method that allows estimations of the polar wind flux densities far in the lobes. We analyze measurements made by the Cluster spacecraft at altitudes from 4 up to 20 RE. We observe a strong dependence on the solar zenith angle in the ion flux density and see that both the ion velocity and density exhibit a solar zenith angle dependence as well. We also find a seasonal variation of the flux density.
    Citation
    Maes, L.; Maggiolo, R.; De Keyser, J.; André, M.; Eriksson, A.I.; Haaland, S.; Li, K.; Poedts, S. (2017). Solar Illumination Control of the Polar Wind. , Journal of Geophysical Research: Space Physics, Vol. 122, Issue 11, 11468-11480, DOI: 10.1002/2017JA024615.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/6358
    doi: http://dx.doi.org/10.1002/2017JA024615
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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