Altitude dependence (5000-30000 km) of inverted-V associated parameters using Polar

Details Altitude dependence (5000-30000 km) of inverted-V associated parameters using Polar Altitude dependence (5000-30000 km) of inverted-V associated parameters using Polar

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0488j&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0488

Physics

2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2716 Energetic Particles, Precipitating, 2772 Plasma Waves And Instabilities

Scientific paper

Discrete auroral arcs and the associated inverted-V type electron precipitation are accompanied by potential structures, upgoing ion beams and plasma density depletions in the acceleration region altitude and above. However, exactly how these phenomena depend on altitude in various Kp and solar illumination conditions as well as at various magnetic local time (MLT) and invariant latitude (ILAT) is not so well known. We review the main results of our recent large statistical studies of the altitude dependence of these parameters using Polar data. We also include similar statistical results on some additional parameters that appear to have major importance in inverted-V auroral acceleration. These parameters include middle-energy (~50-500 eV) electron anisotropies, certain types of electrostatic wave bursts as well as ion shell distributions. One of the most interesting results of the statistical studies is that many of the parameters mentioned change their behaviour rather abruptly at around 3 RE radial distance. The implications of this to the understanding of the physical mechanisms responsible for inverted-V auroral acceleration and discrete auroral arcs are discussed.

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