Recombination Effects on Ion Velocity Distribution Function

Research Fig.18a:

Demonstration of the effect of recombination on the ion velocity distribution function in an inhomogeneous one-dimensional medium (dashed curves) for a force free plasma diffusion in a column of length 300 km. The initial ionization rate corresponds to the situation in the ionospheric F-region between a height of 200-500 km whereas the recombination coefficient has been taken one order of magnitude higher than the actual value (i.e. =5*10^{-8}cm^{3}/sec) in order to exaggerate the recombination effect. f_{I} is plotted at height intervals of 30 km with the length of the dashes increasing from the lower to the upper boundary (the thick solid curve gives a Maxwellian for comparison).

(See FIG.18b for the related height profiles of the total density and flux asymmetry).