Monte-Carlo modeling of polar wind photoelectron distributions with anomalous heat flux

Details Monte-Carlo modeling of polar wind photoelectron distributions with anomalous heat flux Monte-Carlo modeling of polar wind photoelectron distributions with anomalous heat flux

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1023y&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Sept. 1989, p. 1023-1026. Research supported by SNSF and MIT.

Computer Science

Sound

18

Heat Flux, Ionospheric Electron Density, Monte Carlo Method, Photoelectrons, Polar Caps, Dynamics Explorer Satellites, Electron Distribution, Kinetic Equations, Satellite Sounding

Scientific paper

In situ measurements above the polar cap by the DE satellites show asymmetric field-aligned electron velocity distributions in the photoelectron energy range 5-60 eV. The formation of these anisotropic distributions is described by a collisional kinetic equation that includes the effects of Coulomb collisions (via a Fokker-Planck operator), those of a parallel electric field, and the magnetic mirror effects of the geomagnetic field. This equation is solved using a Monte Carlo simulation method. The simulation illustrates the formation of the portion of the observed electron distributions originating in the ionosphere and makes it possible to evaluate the significance of the suprathermal electrons at higher altitude. Both observations and calculations indicate that these electrons possess an energy flux which, by its effect on the polar-wind electric field, may influence the dynamics of the polar-wind outflow.

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