A possible generation mechanism of temporal and spatial structures of flickering aurora

K. Sakanoi, H. Fukunishi, Y. Kasahara

doi:10.1029/2004ja010549

A possible generation mechanism of temporal and spatial structures of flickering aurora

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K. Sakanoi

National Institute of Information and Communications Technology Koganei, Tokyo Japan
H. Fukunishi

Department of Geophysics Tohoku University Sendai, Miyagi Japan
Y. Kasahara

Department of Information and Systems Engineering Kanazawa University Kanazawa, Ishikawa Japan

書誌事項

公開日: 2005-03

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/2004ja010549

公開者: American Geophysical Union (AGU)

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説明

<jats:p>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).</jats:p>