OI 630.0‐nm and N<sub>2</sub> 1PG Emissions in Pulsating Aurora Events Observed by an Optical Spectrograph at Tromsø, Norway

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  • T. T. Tsuda
    Department of Computer and Network Engineering University of Electro‐Communications (UEC) Chofu Japan
  • C. Li
    Department of Computer and Network Engineering University of Electro‐Communications (UEC) Chofu Japan
  • S. Hamada
    Department of Computer and Network Engineering University of Electro‐Communications (UEC) Chofu Japan
  • K. Hosokawa
    Department of Computer and Network Engineering University of Electro‐Communications (UEC) Chofu Japan
  • S.‐i. Oyama
    Institute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya Japan
  • S. Nozawa
    Institute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya Japan
  • T. Kawabata
    Institute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya Japan
  • A. Mizuno
    Institute for Space‐Earth Environmental Research (ISEE) Nagoya University Nagoya Japan
  • J. Kurihara
    Department of Earth and Planetary Sciences Hokkaido University Sapporo Japan
  • T. Nishiyama
    National Institute of Polar Research (NIPR) Tachikawa Japan
  • M. J. Kosch
    South African National Space Agency (SANSA) Hermanus South Africa

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<jats:title>Abstract</jats:title><jats:p>We performed observations of pulsating aurora (PsA) with an optical spectrograph at Tromsø, Norway, during wintertime in 2016–2017. The data analysis of multiple PsA events revealed the PsA spectra for the first time. As the results, the OI 630.0‐nm emissions and the N<jats:styled-content><jats:sub>2</jats:sub></jats:styled-content> 1PG emissions were found in the both spectra during brighter (ON) and darker (OFF) phases in the PsA events. The spectra of pulsations were derived as difference spectra between the ON and OFF spectra. From the obtained spectra of pulsations, it is found that dominant pulsations at 630.0 nm were coming from the N<jats:styled-content><jats:sub>2</jats:sub></jats:styled-content> 1PG (10,7) band, and there were less or minor contributions of the OI 630.0 nm to pulsations at 630.0 nm.</jats:p>

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