Pulsation Characteristics of Jovian Infrared Northern Aurora Observed by the Subaru IRCS with Adaptive Optics

H. Watanabe, H. Kita, C. Tao, M. Kagitani, T. Sakanoi, Y. Kasaba

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We report narrow band-filtered imaging observations of the Jovian H3 + 3.4-μm emission using the IRCS (infrared camera and spectrograph) on the Subaru telescope taken on 25 May 2016. Approximately 1 hr of data was taken at intervals of 45–110 s, with high spatial resolution (~0.2 arcsec) using adaptive optics. In the northern polar region, we found bright patch-like emissions on the poleward side of the main oval. One of them had a pulsation period of ~10 min. We utilized an H3 + emission model to investigate the response time of the H3 + emission to abrupt and periodic variations of the precipitating electron flux. The model showed that the H3 + emission could pulsate with this timescale due to a modulated flux of the precipitating electrons in the kilo-electron-volt to tens of kilo-electron-volt energy range.

Original languageEnglish
Pages (from-to)11,547-11,554
JournalGeophysical Research Letters
Volume45
Issue number21
DOIs
Publication statusPublished - 2018 Nov 16

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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