In the presence of a strong magnetic field (such as the geomagnetic field) the plasma tends to flow along the magnetic-field lines; therefore, in most ionospheric flow calculations the use of the gyrotropic approximation is justified. Here, it is shown that the gyrotropic 20-moment approximation is equivalent to the gyrotropic 16-moment approximation. Consideration is then given to return-current-generated polar wind transients. Ionospheric return currents generate significant downward heavy ion flows in the topside ionosphere with peak values well exceeding 10 to the 8th/sq cm sec. When the return current ceases, the polar ionosphere rapidly returns to its previous equilibrium state. During the recovery phase of the return-current event, an upward-propagating heavy-ion transient is formed, which is mainly characterized by a relatively short O(+) upwelling event. The H(+) escape flux remains a relatively constant (within 10-20 percent) during field-aligned-current events.


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    Titel :

    Time-dependent polar wind modeling


    Beteiligte:
    Gombosi, T. I. (Autor:in) / Nagy, A. F. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1988-01-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Time-dependent polar wind modeling

    Gombosi, T.I. / Nagy, A.F. | Elsevier | 1989



    Helium in the polar wind

    Gombosi, T.I. / Kerr, L.K. / Nagy, A.F. et al. | Elsevier | 1991


    Helium in the polar wind

    Gombosi, T. I. / Kerr, L. K. / Nagy, A. F. et al. | NTRS | 1992


    Initial 3-D neutral polar wind

    Gardner, L. C. / Schunk, R. W. / International Council of Scientific Unions | British Library Conference Proceedings | 2006