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

1 Scopus citations

Abstract

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 (US)
Article number17
JournalSpace Science Reviews
Volume217
Issue number1
DOIs
StatePublished - Feb 2021

Bibliographical note

Funding Information:
The work of RK was supported by JSPS Kakenhi (25302006, 15H02628, 16H06286). C.C. Chaston was supported by ISSI and through NASA grant NNX17AI55G. T.-H. Watanabe was supported by ISSI and by JSPS KAKENHI Grant Number JP16H04086 and JP17H01177. D.K. Whiter was supported by ISSI and NERC (UK) through grant NE/S015167/1. Movies 4, 6 and 7 are from the ASK instrument which has been funded by PPARC, STFC (PP/C502614/1) and NERC (NE/H024433/1, NE/N004051/1) of the United Kingdom and Vetenskapsrådet of Sweden. The authors wish to thank the International Space Science Institute ISSI-Bern for organization of this review and for financial support of the team meeting.

Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

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

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