Identification of Quasi-Static Potential Structure (Inverted-V) and Aflvenic Auroral Acceleration and the Ambiguity of ``Broadband Acceleration'' (Invited)

Details Identification of Quasi-Static Potential Structure (Inverted-V) and Aflvenic Auroral Acceleration and the Ambiguity of ``Broadband Acceleration'' (Invited) Identification of Quasi-Static Potential Structure (Inverted-V) and Aflvenic Auroral Acceleration and the Ambiguity of ``Broadband Acceleration'' (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm31d..02d&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM31D-02

Physics

Plasma Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [7845] Space Plasma Physics / Particle Acceleration

Scientific paper

Comparison of simultaneous downward electron and wave energies and properties at the different altitudes of the Polar and FAST satellites has shown that kinetic Alfven waves can cause broadband auroral electron precipitation on field lines mapping to the plasma sheet boundary layer. We present evidence from FAST electron and wave data that kinetic Alfven waves can also produce broadband auroral electron acceleration at invariant latitudes <65° during large storms. We also provide evidence that quasi-static potential structures (inverted-v) with low potentials relative to the plasma sheet temperature also occur. These structures can result in downgoing broadband auroral electron spectra similar to those produced by Alfvenic acceleration. Further, results of a statistical study of downgoing electron beams observed by FAST between 20-24 MLT indicate that there is a strong dependency of inverted-v potential on latitude. Lower potential structures are found to dominate at lower latitudes, <~68°. Therefore, particularly at lower latitudes, “broadband acceleration” describes multiple electron acceleration mechanisms. Statistical results of a study at low-latitude (<~60-65° ILat), during large storms (<-75nT Dst) indicate that such events occur on >58% (>23%) of the FAST nightside orbits >1° equatorward of the nominal, AL-based, auroral zone (diffuse auroral) boundary during such storms. Further, it is found that both mechanisms can result in spectra that produce type-d aurora.

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