Physics
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11600k02k&link_type=abstract
Journal of Geophysical Research, Volume 116, CiteID A00K02
Physics
2
Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Substorms
Scientific paper
We conducted a ground-based optical measurement pointing at local magnetic zenith with a narrow field of view of 9.3° by 9.3°, using a high-speed electron multiplier charge-coupled device camera at Poker Flat Research Range. We show evidence that auroral folds were periodically formed in a breakup arc and the luminosity is exponentially increased for about 10 s before an auroral breakup onset. The evolution of turbulent microstructures and the formation of folds may be interpreted by the nonlinear evolution of inertial Alfvén wave (IAW) turbulence in the thin current sheet. On the basis of these optical observations, we discuss a possible role of the ionosphere for modulating the triggering process of the onset via the self-organization of the IAW turbulence associated with Kelvin-Helmholtz and tearing instabilities of the thin current sheet.
Ebihara Yusuke
Kataoka Ryuho
Miyoshi Yoshizumi
Sakanoi Takeshi
Shiokawa Kazuo
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