Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..727w&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, July 1989, p. 727-730. Research supported by the Naturvetenskapliga Fors
Physics
33
Auroral Zones, Eiscat Radar System (Europe), F Region, Ion Motion, Electron Energy, Field Aligned Currents, Oxygen Ions, Positive Ions, Vertical Motion
Scientific paper
Observations of large outward field-aligned flows of the bulk ion population in the F region during auroral activity are presented. These ion outflows are most commonly observed within auroral arcs and are not well correlated with diffuse aurora. The ions, mainly O(+), may reach field-aligned outward velocities of more than 500 m/s and the calculated ion fluxes usually reach 10 to the 13/sq m per s. Strong electron temperature enhancements in the F region are observed in connection with almost all ion outflow events. However, high electron temperatures are not always an indicator for these strong ion outflow events. Measurements have been carried out at the EISCAT incoherent scatter facility near Teromso, Norway. The exact mechanism causing the ion outflow is not yet understood, but several possible mechanisms are briefly discussed.
Opgenoorth Hermann J.
Wahlund Jan-Erik
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