A numerical solution to the 20‐moment set of transport equations has been found in order to study subauroral ionospheric outflows during periods of enhanced perpendicular ion drifts. The numerical model solves the time‐dependent O+ density, momentum, and both the parallel and perpendicular energy and heat flow equations in the 200–6000 km altitude range. Assuming perpendicular drifts of 3 km/s relative to the neutral atmosphere, we have found that anisotropic heating of O+ (a result of ion‐neutral collisions) leads to a temperature anisotropy, with perpendicular temperatures exceeding 8000 K and parallel temperatures greater than 5000 K (near 200 km altitude). Above approximately 2000 km, transport processes dominate the effects of collisions and wavelike oscillations in O+ velocity, temperature and heat flux were noted.
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Kőrösmezey et al. (1992) studied this question.
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