Statistics – Computation
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7...83l&link_type=abstract
Annales Geophysicae (ISSN 0980-8752), vol. 7, Feb. 1989, p. 83-90.
Statistics
Computation
25
Gas Ionization, Ionospheric Electron Density, Mathematical Models, Photoelectrons, Solar Terrestrial Interactions, E Region, Extreme Ultraviolet Radiation, Particle Production, Zenith
Scientific paper
In the ionosphere, the EUV solar flux ionizes the neutral gas, producing a primary distribution of electrons. These primary electrons may have sufficient energy to produce new secondary electrons, by inelastic collisions with neutrals. The efficiency of this production is defined in terms of the ratio between the secondary and the primary production. Computation of this efficiency for different solar conditions shows that it is approximately constant above 200 km, varying from 12 percent with a quiet sun to 22 percent with a disturbed sun at 500 km. It increases drastically in the E-region reaching a peak value of 2 to 3 (between 120 and 150 km, depending on the intensity of the solar flux, and the solar zenith angle).
DeVore Richard C.
Kofman Wlodek
Lilensten Jean
Oran Elaine S.
Wisemberg Jacques
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