Diffusion of photoelectrons along a field line inside the plasmasphere

Details Diffusion of photoelectrons along a field line inside the plasmasphere Diffusion of photoelectrons along a field line inside the plasmasphere

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2900l&link_type=abstract

Journal of Geophysical Research, vol. 81, June 1, 1976, p. 2900-2916. Research sponsored by the Centre National de la Recherche

Physics

Geophysics

Coulomb Collisions, Earth Magnetosphere, Electron Diffusion, Electron Flux Density, Photoelectrons, Angular Distribution, Dimensionless Numbers, Electron Energy, Fokker-Planck Equation, Geophysics, Ionospheric Electron Density, Lines Of Force, Sunrise

Scientific paper

The effects of Coulomb collisions on photoelectrons inside the magnetosphere are studied in detail. It is shown that angular diffusion of photoelectrons on electrons and ions must be considered, as well as energy loss of photoelectrons on electrons. Diffusion causes trapping of photoelectrons in the middle of the field line and thus decreases the transparency of the magnetosphere for photoelectrons streaming between conjugate ionospheres. It is shown that the transparency of the field line depends mainly on a parameter (given by the square of the mean energy of the escaping photoelectron flux divided by I(N)), proportional to the integral of the electron density along the field line. The other parameters (L value, electron temperature at the boundary, and anisotropy of the escaping flux) affect only the repartition of the photoelectron flux along the field line. The transparency of the field tube is approximately divided by 2 when angular diffusion is considered.

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