Turbulent microstructures and formation of folds in auroral breakup arc

Ryuho Kataoka, Yoshizumi Miyoshi, Takeshi Sakanoi, Ayumi Yaegashi, Kazuo Shiokawa, Yusuke Ebihara

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numberA00K02
JournalJournal of Geophysical Research: Space Physics
Volume116
Issue number4
DOIs
Publication statusPublished - 2011 Jan 1

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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