Non-thermal ISR scatter and auroral forms associated with a substorm expansion

Details Non-thermal ISR scatter and auroral forms associated with a substorm expansion Non-thermal ISR scatter and auroral forms associated with a substorm expansion

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33a2133d&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM33A-2133

Physics

Plasma Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [2407] Ionosphere / Auroral Ionosphere, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Ground-based observations of a poleward substorm expansion using a high-resolution CMOS camera (50 frames/sec, 50 m spatial) and the electronically steerable Poker Flat Incoherent Scatter Radar (PFISR) have clarified the relationship between fine scale auroral structure and the development of non-thermal ISR echoes commonly referred to as NEIALs (Naturally Enhanced Ion Acoustic Lines). The measurements provide an unprecedented view into the temporal development of auroral forms and the decameter scale irregularities responsible for NEIALs. The highly structured auroral forms present during this event provide insight into the filamentary current systems associated with dispersive Alfvén waves, which determine the spatial dynamics of the aurora. There are existing models of the production of NEIALs that are dependent on a large current density, which has been observed in fine scale aurora, whereas other models are dependent on beams of precipitating electrons with low energy. Explanations in terms of true density enhancements have also been suggested. The results in this paper suggest that multiple mechanisms may be required to explain the observed spectral distortions. Speculations are provided concerning the mode of magnetosphere-ionosphere coupling underlying the optical and ISR features.

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