Determination of low energy photoelectron distribution from plasma line measurements at Saint Santin
Abstract
The plasma lines observed by the French incoherent scatter radar during the period 19731974 are studied. Two methods are used to determine the steadystate photoelectron flux from plasma line measurements; one using a Maxwellian model for the photoelectron 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 kT_{p} 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 ∼ 5 eV. This result, in agreement with rocket and satellite measurements of the low energy photoelectron flux, is used to bear a new insight to the problem of the electrongas heat balance: the problem is reduced to the need of an additional photoelectron flux production below 5 eV.
 Publication:

Planetary and Space Science
 Pub Date:
 July 1980
 DOI:
 10.1016/00320633(80)901117
 Bibcode:
 1980P&SS...28..661K
 Keywords:

 Electron Plasma;
 Ionospheric Electron Density;
 Photoelectrons;
 Plasma Spectra;
 Spectral Line Width;
 Electron Distribution;
 Electron Gas;
 Electron Scattering;
 Energy Spectra;
 MaxwellBoltzmann Density Function;
 Plasma Frequencies;
 Radar Measurement;
 Geophysics