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2000 Fiscal Year Final Research Report Summary

Serial optical observation of Jovian plasma processes at the summit of Mauna Kea in Hawaii

Research Project

Project/Area Number 11691115
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section海外学術
Research Field Space and upper atmospheric physics
Research InstitutionTohoku University

Principal Investigator

MORIOKA Akira  Graduate School of Science, Tohoku University, Professor, 大学院・理学研究科, 教授 (50004479)

Co-Investigator(Kenkyū-buntansha) SAKANOI Takeshi  Graduate School of Science, Tohoku University, Research Associate, 大学院・理学研究科, 助手 (80271857)
MISAWA Hiroaki  Graduate School of Science, Tohoku University, Associate Professor, 大学院・理学研究科, 助教授 (90219618)
OKANO Shoichi  Graduate School of Science, Tohoku University, Professor, 大学院・理学研究科, 教授 (10004483)
SATOH Takehiko  Science University of Tokyo, Frontieer Center, Lecturer, 計算機科学フロンティア研究センター, 講師 (10297632)
TSUCHIYA Fuminori  Graduate School of Science, Tohoku University, Research Associate, 大学院・理学研究科, 助手 (10302077)
Project Period (FY) 1999 – 2000
KeywordsJovian plasma / Jupiter's magnetosphere / Io satellite / Io volcano / Sodium gas / Io torus / charge exchange / molecular ion destraction
Research Abstract

The study, 2-dimensional imaging observations of the D-line emission distribution of logenic sodium atoms, which is regarded as a tracer of logenic volcanic gases, were performed with two field of views (FOV), namely±20Rj (narrow FOV ; Rj : Jovian radius), and ±400Rj (wide FOV). From the observational results, the following characteristics of emission distribution were obtained. In the narrow FOV observation, two different types of distribution extending to〜20Rj, that is, the band-shaped distribution and the spray-shaped distribution, were observed simultaneously. In the wide FOV observation, the elongated oval-like emission distribution extended to as much as 400Rj along the equatorial plane was observed. The east-west intensity asymmetry was also observed, with a dependence on the Io phase angle.
Based on the observed images , we then made model analyses to investigate supply processes of sodium atoms and time variation of sodium distribution, and presented the comprehensive source process which can consistently reproduce the observed characteristics both in the narrow and wide FOV observation.
From the model analysis for the narrow FOV observational results, it is concluded that the band-shaped distribution is attributed to the molecular ion destruction process, and the typical gyrovelocity of the molecular ions is estimated to be 20km/sec. It is also concluded that the spray-shaped distribution is produced through the charge exchange process. Then a combination of the two processes was examined for the wide FOV observational results. The combined model analysis could fairly reproduce the observed features of the wide extended sodium distribution. In the course of the model analysis, some important physical processes and related parameters are suggested.

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Morioka,A.: "Pitch angle distribution of relativistic electrons in the inner radiation belt and its relation to equatorial plasma wave turbulence phenomena"Geophysical Researh Letters. 28. 931-934 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Misawa,H..: "Observations of Jovian decimetric radiation at a frequency of 327 MHz"Advanced Space Research. 26. 1537-1540 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takahashi,S.: "Distribution of sodium cloud near Io and in the inner Jovian magnetosphere"Advanced Space Research. 26. 1529-1532 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nozawa,H.: "Variabilitv of SII emission from the Io plasma torus"Advanced Space Research. 26. 1525-1528 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakagawa,F.: "On the sources of Jovian hectometric radiation"Advanced Space Research. 26. 1525-1528 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyoshi,Y.: "Long term modulation of low altitude proton radiation belt by the Earth's atmosphere"Geophysical Research Letters. 27. 2169-2172 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyoshi,Y.: "Observation of short-term variation of Jovian synchrotron radiation at a frequency of 2290 MHz"Advanced Space Research. 26. 1533-1536 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuchiya,F.: "Jovian electron modulations by the solar wind interaction with the magnetosphere"Earth Planets and Space. 51. 987-996 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sakanoi,T.: "Observations of vertical winds in the thermosphere with a Fabry-Perot Doppler Imager at Syowa Station, Antarctica"Advanced Space Research. 24. 1439-1442 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyoshi,Y.: "Observation of short-term variation of Jupiter's synchrotron radiation"Geophysical Research Letters. 26. 9-12 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morioka, A.: "Pitch angle distribution of relativistic electrons in the inner radiation belt and its relation to equatorial plasma wave turbulence phenomena"Geophys.Res.Lett.. Vol.28, No.5. 931-934 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Misawa, H.: "Observations of Jovian decimetric radiation at a frequency of 327MHz"Adv.Space Res.. Vol.26, No.10. 1537-1540 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahashi, S.: "Distribution of sodium cloud near Io and in the inner Jovian magnetosphere"Adv.Space Res.. Vol.26, No.10. 1529-1532 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nozawa, H.: "Variability of SII emission from the Io plasma torus"Adv.Space Res.. Vol.26, No.10. 1529-1532 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakagawa, F.: "On the sourses of Jovian hectometric radiation"Adv.Space Res.. Vol.26, No.10. 1525-1528 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyoshi, Y.: "Long term modulation of low altitude proton radiation belt by the Earth's atmosphete"Geophys.Res.Lett.. Vol.27. 2169-2172 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyoshi, Y.: "Observation of Short term variation of Jovian synchrotron radiation at a frequency of 2290MHz"Adv.Space Res.. Vol.26, No.10. 1533-1536 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuchiya, F.: "Jovian electron modulations by the solar wind interaction with the magnetosphere"Earth Planets and Space. Vol.51. 987-996 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sakanoi, T.: "Observations of Vertical Winds in the Thermosphere with a Fabry-Perot Doppler Imager at Syowa Station, Antarctica"Adv.Space Res.. Vol.24, No.11. 1439-1442 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyoshi, Y.: "Observation of short-term variation of Jupiter's synchrotron radiation."Geophys.Res.Lett.. Vol.26. 9-12 (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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