Asymmetric incoherent scatter spectra from a relaxation collision model

Details Asymmetric incoherent scatter spectra from a relaxation collision model Asymmetric incoherent scatter spectra from a relaxation collision model

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..133c&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 52, Feb. 1990, p. 133-150.

Physics

4

Gas-Ion Interactions, Incoherent Scatter Radar, Ion Motion, Ionospheric Ion Density, Neutral Gases, Doppler Effect, Electric Fields, Gyrofrequency, Line Of Sight, Velocity Distribution

Scientific paper

A relaxation collision model for ion flow through a stationary neutral gas has been used to obtain ion velocity distributions and line-of-sight incoherent scatter spectra for a range of values of collision frequency and electric field. The mean velocity of the line-of-sight ion velocity distribution has been compared with the Doppler shift of the corresponding spectra. The latter is not always a good estimate of the former, because the ion velocity distribution in the plane perpendicular to the magnetic field direction is highly distorted. For ion-neutral collision frequency to ion gyrofrequency ratios (IGRs) 0.1-0.5, the greatest inaccuracies in mean velocity estimation take place along the electric field direction, while for IGRs = 0.5-1.0 the greatest inaccuracies occur across the electric field direction. These inaccuracies would be reduced but not eliminated in a more realistic model. At F-region altitudes, other processes must be invoked to explain observed asymmetrical spectra, but the comparison of mean line-of-sight ion velocity and spectrum Doppler shift may still have relevance.

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