On the identification and occurrence of ion frictional heating events in the high-latitude ionosphere

Details On the identification and occurrence of ion frictional heating events in the high-latitude ionosphere On the identification and occurrence of ion frictional heating events in the high-latitude ionosphere

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..587m&link_type=abstract

(Thermospheric and ionospheric dynamics; Symposium, Exeter, England, July 1989, Selected Papers. A92-10626 01-46) Journal of Atm

Physics

13

Auroras, F Region, Ionospheric Heating, Particle Interactions, Synoptic Measurement, E Region, Eiscat Radar System (Europe), Field Aligned Currents, Ion Temperature, Particle Precipitation, Ultrahigh Frequencies

Scientific paper

Ion-heating events are studied by means of two years of UHF data from 'common program' modes including ion temperatures measured in the field-aligned direction. The ion thermal velocity distribution is assumed to be Maxwellian to obtain the line-of-sight ion temperature, although increasing differences between the ion and neutral velocities lead to less Maxwellian distributions. The diurnal distribution of F-region frictional heating shows similar numbers of heating events at dawn and dusk sectors, a result that contradicts previous studies of higher latitudes. The intervals of ion heating are longest before dawn, are similar in the pre- and post-midnight sectors, and tend to accompany strong structured particle precipitation. The existence of a polarization electric field within the auroral form opposing the convection electric field in direction is proposed to explain the behavior.

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