Return Current Region Aurora: Intense Energetic Non-gyrotropic Ion Conics

Details Return Current Region Aurora: Intense Energetic Non-gyrotropic Ion Conics Return Current Region Aurora: Intense Energetic Non-gyrotropic Ion Conics

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11c..05l&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11C-05

Physics

2407 Auroral Ionosphere (2704), 2451 Particle Acceleration, 2708 Current Systems (2409), 7867 Wave/Particle Interactions

Scientific paper

We consider ion heating in downward current, downward electric field, pre-midnight auroral regions, considering in particular case studies of extremely energetic and apparently non-gyrotropic ion conics. In these case studies, the two dimensional ion phase space distribution functions measured by the FAST electrostatic analysers appear to show non-gyrotropic distributions, presumably because the plasma rest frame has a large perpendicular velocity with respect to the observational rest frame. Previous work included a statistical study of the parameters of ion conics in these regions, but tended to exclude these most energetic events as they overlap in the ion data with the precipitating plasma sheet ion population. A more detailed analysis is given here of particular case studies of the more energetic events, which show bulk perpendicular flows and reach energies over 1 keV. We examine whether these intense events are simply high-energy high-flux examples of more typical ion conics, or if they are a separate phenomenon, i.e. parameterized differently in terms of their association with related DC fields and currents, and with broadband ELF wave activity. We also compare the transverse flow associated with their perpendicular bulk velocity moments to the accompanying DC perpendicular electric field.

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