Determination of low energy photoelectron distribution from plasma line measurements at Saint Santin

Details Determination of low energy photoelectron distribution from plasma line measurements at Saint Santin Determination of low energy photoelectron distribution from plasma line measurements at Saint Santin

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980p%26ss...28..661k&link_type=abstract

Planetary and Space Science, vol. 28, July 1980, p. 661-673.

Other

Electron Plasma, Ionospheric Electron Density, Photoelectrons, Plasma Spectra, Spectral Line Width, Electron Distribution, Electron Gas, Electron Scattering, Energy Spectra, Maxwell-Boltzmann Density Function, Plasma Frequencies, Radar Measurement

Scientific paper

The plasma lines observed by the French incoherent scatter radar during the period 1973-1974 are studied. Two methods are used to determine the steady-state photoelectron flux from plasma line measurements; one using a Maxwellian model for the photoelection distribution and the other by solving (numerically) the differential equation that is satisfied by the distribution. The direct numerical calculation of the photoelectron flux is used to obtain theoretical plasma wave intensity values which are compared with those from the plasma line observation. The comparison leads to the conclusion that there must be a sharp increase of the photoelectron flux when the energy decreases below 4-5eV. This result, in agreement with rocket and satellite measurements of the low energy photoelectron flux, is used to provide a new insight to the problem of the electron-gas heat balance: the problem is reduced to the need for additional photoelectron flux production below 5 eV.

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