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Study on Jupiter's auroral radiation and lightning as viewed from Juno and Earth-based telescopes

Research Project

Project/Area Number 20K22371
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionNiihama National College of Technology

Principal Investigator

Imai Masafumi  新居浜工業高等専門学校, 電気情報工学科, 助教 (10877260)

Project Period (FY) 2020-09-11 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords木星オーロラ電波 / 雷 / Juno / 地上電波望遠鏡 / ハッブル宇宙望遠鏡
Outline of Research at the Start

2016年7月、米国・NASAの木星探査機Junoが、史上初となる木星極軌道に投入された。申請者はアイオワ大学の博士研究員として4年間、同機に搭載された波動観測装置が取得したデータを解析し、木星オーロラ電波や雷についての新しい様相を明らかにしてきた。しかしながら、Junoの1地点衛星観測では空間的にも時間的にも激しく変動する木星オーロラや大気のダイナミクスを捉えることは難しい。本研究では、Juno探査機の主要ミッションが2021年夏まで延長されたことを活かして、その期間中に地上から電波や紫外・可視・近赤外の同時観測を行い、木星オーロラと大気のダイナミクスを探査する。

Outline of Final Research Achievements

Jupiter produces auroral radiation from the polar regions of the planet and lightning discharge in the atmosphere. By means of Juno spacecraft in the orbit of Jupiter and the Earth-based radio telescopes, we found that Jupiter's auroral radiation extends over a broad range of Jovicentric latitude. Additionally, using Juno and the Hubble Space Telescope, we showed a minimum duration of lightning processes on the order of submilliseconds, and the cloud-free clearings are another component for the signature of active convection.

Academic Significance and Societal Importance of the Research Achievements

木星に存在するオーロラや雷のような現象から様々な電波が発生している。2016年7月に米国・NASAのJuno探査機が初めて木星極周回軌道に投入され、地上望遠鏡と探査機を新たに組み合わせた木星オーロラ電波や雷の研究が行えるようになった。この利点を最大限に利用し、木星オーロラ電波の立体的なビーム構造の存在を明らかにし、さらに木星雷と大気との関係により新たな雷の時間的と空間的な情報を明らかにした。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (22 results)

All 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (7 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 7 results) Presentation (11 results) (of which Int'l Joint Research: 9 results,  Invited: 1 results)

  • [Int'l Joint Research] University of Iowa/University of California, Berkeley/Southwest Research Institute(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Institute of Atmospheric Physics/Charles University(チェコ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Iowa/University of California, Berkeley/Southwest Research Institute(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Institute of Atmospheric Physics/Charles University(チェコ)

    • Related Report
      2020 Research-status Report
  • [Journal Article] A Comprehensive Set of Juno In Situ and Remote Sensing Observations of the Ganymede Auroral Footprint2022

    • Author(s)
      Hue, V.、Szalay, J. R.、 Greathouse T. K.、 [and 24 others, including M. Imai]
    • Journal Title

      Geophysical Research Letters

      Volume: 49 Issue: 7

    • DOI

      10.1029/2021gl096994

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Loss of energetic ions comprising the ring current populations of Jupiter's middle and inner magnetosphere2022

    • Author(s)
      Mauk B. H.、Allegrini F.、Bagenal F.、Bolton S. J.、Clark G.、Connerney J. E. P.、Gershman D. J.、Haggerty D. K.、Hue V.、Imai M.、Kollmann P.、Kurth W. S.、Nenon Q.、Paranicas C. P.、Rymer A. M.、Smith H. T.、Sulaiman A. H.
    • Journal Title

      Journal of Geophysical Research: Space Physics

      Volume: 127 Issue: 5

    • DOI

      10.1029/2022ja030293

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Simultaneous UV Images and High‐Latitude Particle and Field Measurements During an Auroral Dawn Storm at Jupiter2021

    • Author(s)
      Ebert R. W.、Greathouse T. K.、Clark G.、Hue V.、Allegrini F.、Bagenal F.、Bolton S. J.、Bonfond B.、Connerney J. E. P.、Gladstone G. R.、Imai M.、Kotsiaros S.、Kurth W. S.、Levin S.、Louarn P.、Mauk B. H.、McComas D. J.、Paranicas C.、Sulaiman A. H.、Szalay J. R.、Thomsen M. F.、Wilson R. J.
    • Journal Title

      Journal of Geophysical Research: Space Physics

      Volume: 126 Issue: 12

    • DOI

      10.1029/2021ja029679

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Low‐Latitude Whistler‐Mode and Higher‐Latitude Z‐Mode Emission at Jupiter Observed by Juno2021

    • Author(s)
      Menietti J. D.、Averkamp T. F.、Imai M.、Kurth W. S.、Clark G. B.、Allegrini F.、Groene J. B.、Faden J. B.、Bolton S. J.
    • Journal Title

      Journal of Geophysical Research: Space Physics

      Volume: 126 Issue: 2

    • DOI

      10.1029/2020ja028742

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First Report of Electron Measurements During a Europa Footprint Tail Crossing by Juno2020

    • Author(s)
      Allegrini F.、Gladstone G. R.、Hue V.、Clark G.、Szalay J. R.、Kurth W. S.、Bagenal F.、Bolton S.、Connerney J. E. P.、Ebert R. W.、Greathouse T. K.、Hospodarsky G. B.、Imai M.、Louarn P.、Mauk B. H.、McComas D. J.、Saur J.、Sulaiman A. H.、Valek P. W.、Wilson R. J.
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 18

    • DOI

      10.1029/2020gl089732

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Wave‐Particle Interactions Associated With Io's Auroral Footprint: Evidence of Alfven, Ion Cyclotron, and Whistler Modes2020

    • Author(s)
      Sulaiman A. H.、Hospodarsky G. B.、Elliott S. S.、Kurth W. S.、Gurnett D. A.、Imai M.、Allegrini F.、Bonfond B.、Clark G.、Connerney J. E. P.、Ebert R. W.、Gershman D. J.、Hue V.、Janser S.、Kotsiaros S.、Paranicas C.、Santolik O.、Saur J.、Szalay J. R.、Bolton S. J.
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 22

    • DOI

      10.1029/2020gl088432

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Energetic Proton Acceleration Associated With Io's Footprint Tail2020

    • Author(s)
      Clark G.、Mauk B. H.、Kollmann P.、Szalay J. R.、Sulaiman A. H.、Gershman D. J.、Saur J.、Janser S.、Garcia‐Sage K.、Greathouse T.、Paranicas C.、Allegrini F.、Bagenal F.、Bolton S. J.、Connerney J. E. P.、Ebert R. W.、Hospodarsky G.、Haggerty D.、Hue V.、Imai M.、Kotsiaros S.、McComas D. J.、Rymer A.、Westlake J.
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 24

    • DOI

      10.1029/2020gl090839

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] New understanding on Jupiter's lightning in the atmosphere as revealed by Juno2021

    • Author(s)
      M. Imai, W. S. Kurth, I. Kolmasova, O. Santolik, M. H. Wong, S. T. Brown, G. B. Hospodarsky, T. Guillot, H. N. Becker, S. J. Bolton, S. M. Levin
    • Organizer
      Japan Geoscience Union Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Simultaneous UV Images and High-Latitude Particle and Field Measurements During an Auroral Dawn Storm at Jupiter2021

    • Author(s)
      R. W. Ebert, T. K. Greathouse, G. Clark, V. Hue, F. Allegrini, F. Bagenal, S. J. Bolton, B. Bonfond, J. E. P. Connerney, G. R. Gladstone, M. Imai, Stavros Kotsiaros, W. S. Kurth, S. Levin, P. Louarn, B. H. Mauk, D. J. McComas, C. Paranicas, A. H. Sulaiman, J. R. Szalay, M. F. Thomsen, R. J. Wilson
    • Organizer
      Magnetospheres of the Outer Planets 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Loss Processes of Energetic Ring Current Ions in Jupiter's Inner and Middle Magnetosphere2021

    • Author(s)
      B. H. Mauk, F. Allegrini, F. Bagenal, S. J. Bolton, G. Clark, J. E. P. Connerney, D. J. Gershman, D. K. Haggerty, V. Hue, M. Imai, P. Kollmann, W. S. Kurth, C. P. Paranicas, A. M. Rymer, H. T. Smith, A. Sulaiman
    • Organizer
      Magnetospheres of the Outer Planets 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Planetary Radio Observation CubeSat: Current Step on Earth to Next Step on Moon2021

    • Author(s)
      M. Imai, K. Imai, N. Hirakoso, M. Nishio, T. Takada, K. Kitamura, J. Nakaya, Y. Murakami, M. Tokumitsu, M. Wakabayashi
    • Organizer
      ISAS Planetary Exploration Workshop 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Juno Waves Observations of Long Dispersion Lightning Whistlers Associated with the Io Torus2021

    • Author(s)
      G.B. Hospodarsky, W.S. Kurth, M. Imai, I. Kolmasova, O. Santolik, J.E.P. Connerney, S.J. Bolton
    • Organizer
      American Geophysical Union (hybrid) meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Comprehensive Set of Juno In Situ and Remote Sensing Observations of the Ganymede Auroral Footprint2021

    • Author(s)
      V. Hue, J.R Szalay, T. Greathouse, [and 24 others, including M. Imai]
    • Organizer
      American Geophysical Union (hybrid) meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Electromagnetic Evidence of Stepwise Extension of the Jovian Lightning Channels2021

    • Author(s)
      I. Kolmasova, O. Santolik, M. Imai, W.S. Kurth, G.B. Hospodarsky, S.J. Bolton, J.E.P. Connerney
    • Organizer
      American Geophysical Union (hybrid) meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Jupiter’s magnetic field and the generation and control of decameter radiation observed by the Juno spacecraft2021

    • Author(s)
      Y.M. Martos, J.E.P. Connerney, M. Imai, W.M. Farrell, W.S. Kurth
    • Organizer
      American Geophysical Union (hybrid) meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] KOSEN-1 Jupiter radio observation campaign with ground-based radio telescopes2021

    • Author(s)
      M. Imai, K. Imai, N. Hirakoso, Y. Ito, T. Sugawara, S. Suzuki, M. Nishio, T. Takada, K. Kitamura, J. Nakaya, Y. Murakami, M. Tokumitsu, T. E. Clarke, C. A. Higgins, J. F. Helmboldt, KOSEN-1 team
    • Organizer
      SGEPSS Fall Meeting 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] 広域・高時間分解観測から迫る空電と雷雨に関連した木星雷由来の電波パルス2020

    • Author(s)
      Masafumi Imai, Michael H. Wong, Ivana Kolmasova, Shannon T. Brown, Ondrej Santolik, William S. Kurth, George B. Hospodarsky, Scott J. Bolton, Steven M. Levin
    • Organizer
      第148回地球電磁気・地球惑星圏学会講演会(オンライン)
    • Related Report
      2020 Research-status Report
  • [Presentation] A single-baseline analysis of Jupiter's decametric radiation with LWA-1 and LWA-SV2020

    • Author(s)
      Masafumi Imai, Taiki Soga, Kazumasa Imai, Charles A. Higgins
    • Organizer
      Technology for Next Generation Space-Earth Environmental Radio Science, Online
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-09-29   Modified: 2023-01-30  

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