Physics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11003206s&link_type=abstract
Journal of Geophysical Research, Volume 110, Issue A3, CiteID A03206
Physics
17
Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Plasma Waves And Instabilities (2471)
Scientific paper
Optical observations of flickering aurora by a high-speed imaging photometer system were carried out at Syowa Station in 1998. A comparison between observed parameters of flickering aurora and theoretical values of dispersive Alfvén waves indicates that observed flickering aurora would be produced by electron flux modulations by electromagnetic ion cyclotron waves or inertial Alfvén waves in the auroral acceleration region located over the altitude range of ~2000-5000 km. Interference wave patterns of two dispersive Alfvén waves in a resonance cone can explain the observed temporal and spatial structures of flickering aurora; flickering columns (or spots) remain in almost the same location during their lifetime and that their shapes become indistinguishable every half flickering period at the timing of the interchange of the bright and dark columns (or spots).
Fukunishi Hiroshi
Kasahara Yasushi
Sakanoi Kazuyo
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