Physics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..843j&link_type=abstract
Geophysical Research Letters, vol. 5, Oct. 1978, p. 843-846.
Physics
Atmospheric Ionization, Earth Ionosphere, Electron Flux Density, Photoelectrons, Photoionization, Energy Distribution, Green'S Functions
Scientific paper
Boltzmann-Fokker-Planck (BFP) theory is used to analyze the (isotropic) photoelectron flux in earth's ionosphere at energies in the vicinity of photoionization peaks where the electron impact cross sections are slowly varying functions of energy. A Green's function solution for the photoelectron flux is given which shows that the energy derivative terms in the BFP method dominate the solution in spectral regions of high slope. Analytical results for the photoelectron flux and the forward and backward half-widths in the vicinity of isolated photoionization peaks are given which explain the observed asymmetry and shift of the photoionization peaks with increasing altitude. At low altitudes these results indicate that the theoretical width of an isolated photoionization peak is less than the experimental resolution of recent AE-E data. A comparison between the theoretical photoelectron flux averaged using the experimental resolution and the experimental photoelectron flux from 15 to 35 eV at 182 km shows reasonable relative agreement.
Jasperse John R.
Smith Robert E.
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