Small-Scale Dynamic Aurora

Ryuho Kataoka, Chris Chaston, David Knudsen, Kristina A. Lynch, Robert L. Lysak, Yan Song, Robert Rankin, Kiyoka Murase, Takeshi Sakanoi, Joshua Semeter, Tomo Hiko Watanabe, Daniel Whiter

Research output: Contribution to journalReview articlepeer-review

2 Citations (Scopus)


Small-scale dynamic auroras have spatial scales of a few km or less, and temporal scales of a few seconds or less, which visualize the complex interplay among charged particles, Alfvén waves, and plasma instabilities working in the magnetosphere-ionosphere coupled regions. We summarize the observed properties of flickering auroras, vortex motions, and filamentary structures. We also summarize the development of fundamental theories, such as dispersive Alfvén waves (DAWs), plasma instabilities in the auroral acceleration region, ionospheric feedback instabilities (IFI), and the ionospheric Alfvén resonator (IAR).

Original languageEnglish
Article number17
JournalSpace Science Reviews
Issue number1
Publication statusPublished - 2021 Feb


  • Auroral breakup
  • Auroral phenomena
  • Dispersive Alfven waves
  • Flickering aurora
  • Ionospheric Alfven resonator
  • Ionospheric feedback instabilities
  • Magnetosphere-ionosphere coupled region

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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