Statistical results on the occurrence frequency of auroral potential structures, upgoing ion beams and plasma density depletions as a function of altitude (5000-30000 km)

Details Statistical results on the occurrence frequency of auroral potential structures, upgoing ion beams and plasma density depletions as a function of altitude (5000-30000 km) Statistical results on the occurrence frequency of auroral potential structures, upgoing ion beams and plasma density depletions as a function of altitude (5000-30000 km)

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm21b0534o&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM21B-0534

Physics

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

Scientific paper

In the acceleration region and possibly above, negative potential structures, upgoing ion beams and plasma density cavities are known to be associated with inverted-V electron precipitation and discrete auroral arcs at the conjugate footpoint in the ionosphere. Here we present results from recent large statistical studies of these three parameters. We especially concentrate on the altitude dependence of each parameter under various Kp index and solar illumination conditions as well as for different magnetic local time (MLT) and invariant latitude (ILAT). We use 3-5 years of Polar data to study the altitude dependence of the occurrence frequency of each parameter. The potential structures are found by locating local minima in the plasma potential which is obtained by integrating the measured spin-plane electric field from the EFI instrument along Polar orbit. Upgoing ion beams are detected from Polar/TIMAS and DE-1/EICS differential energy flux data. Plasma density depletions are studied by thresholding the spacecraft potential data produced by Polar/EFI with various thresholds. All the processing methods are automatic and do not involve manual classification or neural networks. The results show that there is a preferred altitude at about 10000-15000 km altitude for all these auroral-related phenomena. The implications of this to the physics of auroral electron acceleration are discussed.

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