Helium in the Polar Wind
نویسندگان
چکیده
The coupled, time-dependent continuity, momentum andenergy equations for fourcharged species (H~, Het Q~and electrons) moving through astationary upper neutral atmosphere (composed of02, N2, 0, He, H) were solved along open geomagnetic field lines using a modified version of the /5/ model. The thermospheric densities and temperatures, obtainedfrom the MSIS-86 model /7/, were used to calculate neutral-ion sources, sinks, and collision frequencies. Thevarious cross sections and conductivities employed by the /5/ model were also updated. The paper presents the first time-dependent solutions for the He’ component of thepolar wind. Special attention is paid to the solar cycle variationof the ion upflows.
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