Masunaga Kei 益永圭

Researcher Number	60909521
Other IDs
Affiliation (Current)	2026: 山形大学, 学士課程基盤教育院, 講師
Affiliation (based on the past Project Information) *help	2024 – 2025: 山形大学, 学士課程基盤教育院, 講師 2021 – 2023: 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 宇宙航空プロジェクト研究員
Review Section/Research Field	Principal Investigator Basic Section 17010:Space and planetary sciences-related / 0204:Astronomy, earth and planetary science, and related fields
Keywords	Principal Investigator MAVEN / 外気圏 / 火星 / MMX / 大気流出 / フォボス / イオン観測 / ピックアップイオン / ひさき / 電離圏 / 大気波動 / ダストストーム / 超高層大気

火星外気圏の非熱的流出機構が火星の水及びCO2大気の喪失に及ぼす影響の研究Principal Investigator
- Principal Investigator
  
  益永圭
- Project Period (FY)
  2025 – 2028
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 17010:Space and planetary sciences-related
- Research Institution
  Yamagata University
外気圏リトリーバル手法を用いた火星外気圏大気と火星衛星フォボスの相互作用の研究Principal Investigator
- Principal Investigator
  
  益永圭
- Project Period (FY)
  2022 – 2025
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 17010:Space and planetary sciences-related
- Research Institution
  Yamagata University
  Japan Aerospace EXploration Agency
Effects of dust storm and atmospheric waves on Martian atmospheric escapePrincipal Investigator
- Principal Investigator
  
  Masunaga Kei
- Project Period (FY)
  2021 – 2023
- Research Category
  
  Grant-in-Aid for Research Activity Start-up
- Review Section
  
  0204:Astronomy, earth and planetary science, and related fields
- Research Institution
  Japan Aerospace EXploration Agency

All 2025 2024 2023 2022 2021

All Journal Article Presentation

[Journal Article] C+ 133.5 nm Emission Mechanisms on Mars Revealed by the MAVEN Observations2024
- Author(s)
  Sakai Shotaro, Nakagawa Hiromu, Deighan Justin, Jain Sonal K., Masunaga Kei, Tsuchiya Fuminori, Terada Naoki, Mayyasi Majd, Schneider Nicholas M., Mitchell David L., Mazelle Christian, Benna Mehdi, Lillis Robert J., Murakami Go, Curry Shannon M., Seki Kanako
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 977 Issue: 2 Pages: 226-226
- DOI
  10.3847/1538-4357/ad8e35
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19H00707, KAKENHI-PUBLICLY-23H04646, KAKENHI-PROJECT-22H00164, KAKENHI-PROJECT-22K03695, KAKENHI-PROJECT-20KK0074, KAKENHI-PROJECT-22K03708, KAKENHI-PROJECT-22KK0044
[Journal Article] もう一つの月世界へ：火星衛星探査計画MMX その4 ~イオン質量分析による火星大気流出観測の意義~2024
- Author(s)
  益永圭、黒川宏之、小池みずほ、中川広務、寺田直樹、横田勝一郎、MSAチーム、MSSSTチーム
- Journal Title
  
  遊星人
  
  Volume: 33 Pages: 51-59
- Open Access
- Data Source
  KAKENHI-PROJECT-22K03708
[Journal Article] A technique for retrieving the exospheric number density distribution from pickup ion ring distributions2024
- Author(s)
  Masunaga, K., N. Terada, F. Leblanc, Y. Harada, T. Hara, S. Sakai, S. Yokota, K. Seki, A. Yamazaki, J. P. McFadden, T. Usui
- Journal Title
  
  The Planetary Science Journal
  
  Volume: 5 Issue: 8 Pages: 180-180
- DOI
  10.3847/psj/ad65d4
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22H00164, KAKENHI-PROJECT-22K03695, KAKENHI-PROJECT-22K03708, KAKENHI-PROJECT-22KK0045
[Journal Article] On the Periodic Variation of the Ion Density in the Martian Dayside Ionosphere During the Regional Dust Storm in September 20162024
- Author(s)
  Hara Takuya、Masunaga Kei、Terada Naoki、Sakai Shotaro、Osanai Taiga、Seki Kanako、Fowler Christopher M.、Hanley Kathleen Gwen、McFadden James P.、Curry Shannon M.
- Journal Title
  
  Journal of Geophysical Research: Space Physics
  
  Volume: 129 Issue: 4
- DOI
  10.1029/2023ja031848
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708, KAKENHI-PROJECT-21K20387, KAKENHI-PROJECT-18KK0093, KAKENHI-PROJECT-20H00192, KAKENHI-PROJECT-22H00164, KAKENHI-PROJECT-22K03695, KAKENHI-PROJECT-24K21562
[Journal Article] Alternate oscillations of Martian hydrogen and oxygen upper atmospheres during a major dust storm2022
- Author(s)
  Kei Masunaga, Naoki Terada, Nao Yoshida, Yuki Nakamura, Takeshi Kuroda, Kazuo Yoshioka, Yudai Suzuki, Hiromu Nakagawa, Tomoki Kimura, Fuminori Tsuchiya, Go Murakami, Atsushi Yamazaki, Tomohiro Usui, and Ichiro Yoshikawa
- Journal Title
  
  Nature Communications
  
  Volume: 13 Issue: 1 Pages: 6609-6609
- DOI
  10.1038/s41467-022-34224-6
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708, KAKENHI-PROJECT-21K20387, KAKENHI-PROJECT-20KK0074, KAKENHI-PROJECT-22H00164, KAKENHI-PROJECT-22KJ0989, KAKENHI-PROJECT-23K22561, KAKENHI-PROJECT-20H00192, KAKENHI-PROJECT-22KJ0280
[Journal Article] In situ observations of solar-flare-induced proton cyclotron waves upstream from Mars2022
- Author(s)
  Lin, H., J. Guo, K. Masunaga, K. Seki, C. Mazelle, D. Zhao, H. Huang, J. Zhao, and L. Liu
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 934 Issue: 2 Pages: 183-183
- DOI
  10.3847/1538-4357/ac7d4f
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708, KAKENHI-PROJECT-21K20387, KAKENHI-PROJECT-18KK0093, KAKENHI-PROJECT-22H00164, KAKENHI-PROJECT-20H00192
[Journal Article] BepiColombo mission confirms stagnation region of Venus and reveals its large extend2022
- Author(s)
  M. Persson, et al. (incl. K. Masunaga)
- Journal Title
  
  Nature Communications
  
  Volume: 13 Issue: 1 Pages: 7743-7743
- DOI
  10.1038/s41467-022-35061-3
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708, KAKENHI-PROJECT-21K20387, KAKENHI-PROJECT-22KJ3187, KAKENHI-PROJECT-20K04039, KAKENHI-PROJECT-20K14546
[Journal Article] Reflectivity of Venus’ dayside disk during the 2020 observation campaign: outcomes and future perspectives2022
- Author(s)
  Y. J. Lee, A. Garca Muoz, A. Yamazaki, E. Qumerais, S. Mottola, S. Hellmich, T. Granzer, G. Bergond, M. Roth, E. Gallego-Cano, J.-Y. Chaufray, R. Robidel, G. Murakami, K. Masunaga, and et al.
- Journal Title
  
  The Planetary Science Journal
  
  Volume: 3 Issue: 9 Pages: 209-209
- DOI
  10.3847/psj/ac84d1
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708, KAKENHI-PROJECT-21K20387, KAKENHI-PROJECT-18K03726
[Journal Article] Seasonal and Dust‐Related Variations in the Dayside Thermospheric and Ionospheric Compositions of Mars Observed by MAVEN/NGIMS2021
- Author(s)
  Yoshida Nao、Terada Naoki、Nakagawa Hiromu、Brain David A.、Sakai Shotaro、Nakamura Yuki、Benna Mehdi、Masunaga Kei
- Journal Title
  
  Journal of Geophysical Research: Planets
  
  Volume: 126 Issue: 11
- DOI
  10.1029/2021je006926
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19K03943, KAKENHI-PUBLICLY-20H04605, KAKENHI-PROJECT-19H00707, KAKENHI-PROJECT-21K20387, KAKENHI-PROJECT-18KK0093, KAKENHI-PROJECT-20H00192, KAKENHI-PROJECT-21J13710, KAKENHI-PLANNED-18H05439
[Presentation] かぐや衛星によって観測された月面起源イオンの朝夕非対称2025
- Author(s)
  益永圭、原田裕己、横田勝一郎、寺田直樹、桂華邦裕、堺正太朗、松岡彩子、齋藤義文、加藤大羽
- Organizer
  惑星圏シンポジウム2025
- Data Source
  KAKENHI-PROJECT-22K03708
[Presentation] Exospheric number densities retrieved from pickup ion ring distributions and their temporal variations responding to the dust storm and comet approach events at Mars2024
- Author(s)
  Kei Masunaga and Takuya Hara
- Organizer
  EuroPlanet Science Congres (EPSC) 2024
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708
[Presentation] Mass Analysis of low-energy ions originating from the lunar surface and exosphere: Feasibility study for MMX/MSA observations2024
- Author(s)
  益永圭、原田裕己、横田勝一郎、寺田直樹、堺正太朗、桂華邦裕、松岡彩子、齋藤義文、加藤大羽
- Organizer
  地球電磁気・地球惑星圏学会　2024年秋季年会
- Data Source
  KAKENHI-PROJECT-22K03708
[Presentation] Mars's atmospheric escape and its interaction with Martian moons2023
- Author(s)
  Kei Masunaga
- Organizer
  The 82nd Fujihara Seminar
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] A method of probing Mars’s exosphere using ion measurements: Prospects for MMX/MSA observations2023
- Author(s)
  K. Masunaga
- Organizer
  The 6th MMX SWT meeting
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708
[Presentation] A technique of retrieving the exospheric number density distribution from pickup ion ring distributions observed by MAVEN/STATIC and its application to future MMX/MSA observations2023
- Author(s)
  益永圭、寺田直樹、Leblanc Francois、堺正太朗、横田勝一郎、原田裕己、原拓也、関華奈子、山崎敦、臼井寛裕
- Organizer
  日本地球惑星科学連合2023年大会
- Data Source
  KAKENHI-PROJECT-22K03708
[Presentation] 惑星科学、生命圏科学、および天文学に向けた紫外線宇宙望遠鏡(LAPYUTA)計画と系外惑星観測2023
- Author(s)
  土屋史紀、村上豪、山崎敦、亀田真吾、中山陽史、生駒大洋、桑原正輝、成田憲保、小玉貴則、寺田直樹、鳥海森、野津湧太、行方宏介、木村智樹、垰千尋、古賀亮一、木村淳、大内正己、田中雅臣、益永圭、堺正太朗、吉岡和夫、鍵谷将人、塩谷圭吾
- Organizer
  日本地球惑星科学連合2023年大会
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] Hisaki space telescope observations of the large oscillations of Martian hydrogen and oxygen upper atmospheres2023
- Author(s)
  K. Masunaga, N. Terada, N. Yoshida, Y. Nakamura, T. Kuroda, H. Nakagawa, K. Yoshioka, Y. Suzuki, T. Kimura, F. Tsuchiya, G. Murakami, A. Yamazaki, T. Usui, and I. Yoshikawa
- Organizer
  EGU General Assembly 2023
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] Hisaki space telescope observations of the large oscillations of Martian hydrogen and oxygen upper atmospheres2023
- Author(s)
  K. Masunaga, N. Terada, N. Yoshida, Y. Nakamura, T. Kuroda, K. Yoshioka, Y. Suzuki, H. Nakagawa, T. Kimura, F. Tsuchiya, G. Murakami, A. Yamazaki, T. Usui, and I. Yoshikawa
- Organizer
  EGU General Assembly 2023
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] On the periodic variation of the ion density in the Martian dayside ionosphere during the regional dust storm2023
- Author(s)
  T. Hara, K. Masunaga, N. Terada, S. Sakai, T. Osanai, K. Seki, C. M. Fowler, K. G. Hanley, J. P. McFadden, and S. M. Curry
- Organizer
  AGU Fall Meeting 2023
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] LAPYUTAによる地球型惑星上層大気観測の科学検討2023
- Author(s)
  益永圭、堺正太朗、青木翔平、土屋史紀、村上豪、山崎敦、木村智樹、鍵谷将人、古賀亮一
- Organizer
  日本地球惑星科学連合2023年大会
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] MAVEN/STATICの観測に基づくダストストーム期間の火星電離圏イオン密度の周期変動の研究2022
- Author(s)
  長内大河、益永圭、原拓也、寺田直樹、堺正太朗、吉田奈央
- Organizer
  第152回地球電磁気・地球惑星圏学会
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] 火星への彗星大気成分の輸送についての観測的研究2022
- Author(s)
  益永圭、寺田直樹、堺正太朗、横田勝一郎、原田裕己、原拓也、臼井寛裕
- Organizer
  日本惑星科学会2022年秋季講演会
- Data Source
  KAKENHI-PROJECT-22K03708
[Presentation] Alternate oscillations of Martian hydrogen and oxygen upper atmospheres during a major dust storm: Hisaki space telescope observations2022
- Author(s)
  Kei Masunaga
- Organizer
  MAVEN PSG meeting
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] MAVEN/STATICの観測に基づくダストストーム期間の火星超高層イオン密度変動の研究2022
- Author(s)
  長内大河、益永圭、寺田直樹、堺正太朗、吉田奈央、原拓也
- Organizer
  日本地球惑星科学連合2022年大会
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] MAVEN/STATICの観測に基づくダストストーム期間の火星超高層イオン密度変動の研究2022
- Author(s)
  長内大河、益永圭、堺正太朗、吉田奈央、寺田直樹、原拓也
- Organizer
  第23回惑星圏研究会
- Data Source
  KAKENHI-PROJECT-21K20387
[Presentation] Retrieving exospheric number density from pickup ion ring distributions2022
- Author(s)
  K. Masunaga, N. Terada, F. Leblanc, S. Sakai, S. Yokota, Y. Harada, T. Hara, K. Seki, and T. Usui
- Organizer
  MAVEN PSG meeting fall 2022
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708
[Presentation] Martain exosphere derived from pickup ion measurements: A feasibility study for future MMX mission2022
- Author(s)
  K. Masunaga, N. Terada, S. Sakai, S. Yokota, Y. Harada, T. Hara, and T. Usui
- Organizer
  Japan Geophysical Union Meeting 2022
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03708
[Presentation] 火星ダストストーム発達中における水素および酸素大気光の周期変動2021
- Author(s)
  益永圭、寺田直樹、吉田奈央、黒田剛史、吉岡和夫、木村智樹、土屋史紀、村上豪、山崎敦、吉川一朗
- Organizer
  日本地球惑星科学連合2021年大会
- Data Source
  KAKENHI-PROJECT-21K20387

1. NAKAGAWA Hiromu

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
2. TERADA Naoki

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
3. 青木翔平

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
4. 関華奈子

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
5. 横田勝一郎

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Masunaga Kei 益永 圭

Research Projects

Research Products

Co-Researchers

火星外気圏の非熱的流出機構が火星の水及びCO2大気の喪失に及ぼす影響の研究Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

外気圏リトリーバル手法を用いた火星外気圏大気と火星衛星フォボスの相互作用の研究Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Effects of dust storm and atmospheric waves on Martian atmospheric escapePrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

[Journal Article] C+ 133.5 nm Emission Mechanisms on Mars Revealed by the MAVEN Observations2024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] もう一つの月世界へ：火星衛星探査計画MMX その4 ~イオン質量分析による火星大気流出観測の意義~2024

Author(s)

Journal Title

Data Source

[Journal Article] A technique for retrieving the exospheric number density distribution from pickup ion ring distributions2024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] On the Periodic Variation of the Ion Density in the Martian Dayside Ionosphere During the Regional Dust Storm in September 20162024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Alternate oscillations of Martian hydrogen and oxygen upper atmospheres during a major dust storm2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] In situ observations of solar-flare-induced proton cyclotron waves upstream from Mars2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] BepiColombo mission confirms stagnation region of Venus and reveals its large extend2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Reflectivity of Venus’ dayside disk during the 2020 observation campaign: outcomes and future perspectives2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Seasonal and Dust‐Related Variations in the Dayside Thermospheric and Ionospheric Compositions of Mars Observed by MAVEN/NGIMS2021

Author(s)

Journal Title

DOI

Data Source

[Presentation] かぐや衛星によって観測された月面起源イオンの朝夕非対称2025

Author(s)

Organizer

Data Source

[Presentation] Exospheric number densities retrieved from pickup ion ring distributions and their temporal variations responding to the dust storm and comet approach events at Mars2024

Author(s)

Organizer

Data Source

[Presentation] Mass Analysis of low-energy ions originating from the lunar surface and exosphere: Feasibility study for MMX/MSA observations2024

Author(s)

Organizer

Data Source

[Presentation] Mars's atmospheric escape and its interaction with Martian moons2023

Author(s)

Masunaga Kei 益永圭

[Presentation] 火星への彗星大気成分の輸送についての観測的研究2022