The coupled time-dependent continuity, momentum, and energy equations for four charged species (H(+), He(+), O(+) and electrons) moving through a stationary upper neutral atmosphere (composed of O2, N2, O, He, and H) were solved along open geomagnetic field lines using a modified version of the Gombosi et al. (1985) model. The thermospheric densities and temperatures, obtained from the MSIS-86 model (Hedin, 1987), were used to calculate neutral-ion sources, sinks, and collision frequencies. The various cross sections and conductivities employed by the Gombosi et al. model were also updated. The paper presents the first time-dependent solutions for the He(+) component of the polar wind. Special attention is paid to the solar cycle variation of the ion upflows.


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    Title :

    Helium in the polar wind


    Contributors:
    Gombosi, T. I. (author) / Kerr, L. K. (author) / Nagy, A. F. (author) / Cannata, R. W. (author)

    Published in:

    Publication date :

    1992-01-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Helium in the polar wind

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


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    Time-dependent polar wind modeling

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



    Polar Wind Density Variations during Storms

    Schunk, R.W. | Online Contents | 1998