Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm31d..05c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM31D-05
Physics
[2407] Ionosphere / Auroral Ionosphere, [2704] Magnetospheric Physics / Auroral Phenomena, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2790] Magnetospheric Physics / Substorms
Scientific paper
In this presentation we exploit Reimei satellite observations to identify the processes which drive the evolution of visible form and facilitate cross-scale energy transport within discrete auroral arcs. From a wavelet analysis of the imagery it is shown that the complex multi-scale motion of auroral forms can generally be described in terms of Alfven wave dispersion. The scaling in vorticity we observe is suggestive of the action of non-linear processes through the auroral acceleration region which lead to energy transport across scales. From a comparison to 3-D reduced MHD simulations we demonstrate how these processes may operate and show how the evolution through the 'Quasi-static' or 'inverted-V aurora' and 'Alfvenic' aurora are facilitated by different instabilities that lead to distinct differences in auroral forms.
Asamura Kazushi
Chaston Christopher. C.
Hirahara Masafumi
Sakanoi Takeshi
Seki Kazuhiko
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