Observations of ion-neutral collisional effects in the auroral E region

Details Observations of ion-neutral collisional effects in the auroral E region Observations of ion-neutral collisional effects in the auroral E region

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9761w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9761-9771.

Computer Science

Sound

6

Auroral Zones, E Region, Energy Distribution, Plasma-Particle Interactions, Electric Fields, Geomagnetism, Ionospheric Currents, Magnetic Field Configurations, Particle Precipitation, Rocket Sounding

Scientific paper

Thermal ion energy distribution functions and local electric and magnetic fields were directly measured for the first time in the ionospheric E region. Measured ion distribution functions were fitted to shifted Maxwellian distributions, and their resulting ion drift velocities were compared with E x B/B-squared velocities from the double-probe electric field observations. The results show that the ion drift direction rotates with respect to the local electric field direction and that the ratio of the magnitudes of the ion velocity to the E x B/B-squared velocity decreases with decreasing altitudes. Using these observations, the quiet time ion-neutral collison frequencies and neutral wind velocities were estimated and found to be consistent with theoretical estimates. However, significant discrepancies between observations and theory are found in the disturbed E region near auroral particle precipitation regions. These data indicate that the auroral atmosphere is significantly perturbed due to Joule as well as particle heating effects.

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