Identification of Extreme Ultraviolet Emission Lines of the Io Plasma Torus Observed by Hisaki/EXCEED

  • R. Hikida
    Department of Earth and Planetary Science The University of Tokyo Tokyo Japan
  • K. Yoshioka
    Department of Complexity Science and Engineering The University of Tokyo Tokyo Japan
  • G. Murakami
    Institute of Space and Astronautical Science (ISAS) Japan Aerospace Exploration Agency (JAXA) Tokyo Japan
  • T. Kimura
    Frontier Research Institute for Interdisciplinary Sciences Tohoku University Sendai Japan
  • F. Tsuchiya
    Planetary Plasma and Atmospheric Research Center Tohoku University Sendai Japan
  • A. Yamazaki
    Institute of Space and Astronautical Science (ISAS) Japan Aerospace Exploration Agency (JAXA) Tokyo Japan
  • I. Yoshikawa
    Department of Complexity Science and Engineering The University of Tokyo Tokyo Japan
  • N. Iwagami
    Retired

書誌事項

公開日
2018-07
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2018je005629
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The sulfur and oxygen ions in the Io plasma torus (IPT), which is located at a distance of ~6 <jats:italic>R</jats:italic><jats:sub>J</jats:sub> from Jupiter, emit light in various wavelength regions. In particular, radiative cooling in the ultraviolet wavelength range plays an important role in the energy balance of the Io torus, and it is important to explore the detailed spectral structure in the ultraviolet region. The ultraviolet spectrum of the IPT in the wavelength range 52.0–148.0 nm with a resolution of 0.3–0.4 nm was obtained by Extreme Ultraviolet Spectroscope for Exospheric Dynamics on the Hisaki satellite. Owing to its instrument performance and long integration time, 10 emission lines from the IPT were detected for the first time. By summarizing previous observations and using the results obtained by Extreme Ultraviolet Spectroscope for Exospheric Dynamics, we updated the term diagrams for S II, S III, and S IV emissions from the IPT. Four excited levels in the IPT were detected for the first time. Detection of the emission lines may improve the estimation accuracy of the fraction of hot electron density using the atomic data.</jats:p>

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