A method for determining ion-neutral collision frequency using radar measurements of ion velocity in two directions

Details A method for determining ion-neutral collision frequency using radar measurements of ion velocity in two directions A method for determining ion-neutral collision frequency using radar measurements of ion velocity in two directions

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..493n&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, April 1989, p. 493-502.

Computer Science

5

Collision Rates, E Region, Ion Atom Interactions, Ionic Collisions, Radar Measurement, Atmospheric Models, Electric Fields, Incoherent Scatter Radar, Radar Beams

Scientific paper

This paper describes a method for determining the ion-neutral collision frequency in the E region using incoherent scatter radar. The method is based on ion velocity due to electric field and neutral wind. Height profiles of two ion velocity components are measured sequentially with vertical and eastward tilted directions of the radar beam, and the electric field is determined from tristatic velocity observations. The collision frequency is then solved from the momentum equation. The method is applicable at higher altitudes than the conventional method using the incoherent scatter spectral shape. The theory is given and examples of collision frequency obtained with the EISCAT UHF radar in August 1985 are presented. The results have been compared with collision frequencies calculated with the MSIS 1986 model atmosphere. They are found to be consistently higher than the model values, as are results from the conventional incoherent scatter method below 110 km, which leads us to believe that the model values for August may be too low.

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