High-speed correction factor to the O(+)-O resonance charge exchange collision frequency

Details High-speed correction factor to the O(+)-O resonance charge exchange collision frequency High-speed correction factor to the O(+)-O resonance charge exchange collision frequency

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..253o&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 3, p. 253-255

Physics

1

Atomic Collisions, Collision Rates, Earth Ionosphere, Oxygen Atoms, Oxygen Ions, Resonance Charge Exchange, Thermosphere, Drift Rate, Kinetic Energy, Momentum Transfer, Temperature, Velocity

Scientific paper

The high-speed correction factor to the O(+)-O collision frequency, resulting from drift velocities between ions and neutrals, is calculated by solving the integral expression in this factor both numerically and analytically. Although the analytic solution is valid for either small or large drift velocities between ions and neutrals, for temperatures of interest and all drift velocities considered, agreement is found between analytic and detailed numerical integration results within less than 1% error. Let T(sub r) designate the average of the ion and neutral temperatures in K, and u = nu(sub d)/alpha, where nu(sub d) is the relative drift velocity in cm/s, and alpha = 4.56 x 10(exp 3) square root of T(sub r) cm/s is the thermal velocity of the O(+)-O system. Then, as u ranges from 0 to 2, the correction factor multiplying the collision frequency increases monotonically from 1 to about 1.5. An interesting result emerging from this calculation is that the correction factor for temperatures of aeronomical interest is to a good approximation independent of the temperature, depending only on the scaled velocity u.

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