Updated on 2024/09/25

写真a

 
CHIBA Shota
 
Organization
Institute for Space-Earth Environmental Research Center for Integrated Data Science Designated assistant professor
Title
Designated assistant professor

Degree 3

  1. Doctor of Philosophy ( 2024.3   The University of Tokyo ) 

  2. Master of Science ( 2021.3   The University of Tokyo ) 

  3. Bachelor of Science ( 2019.3   Meiji University ) 

Awards 2

  1. SGEPSS Student Presentation Award (Aurora Medal)

    2023   Society of Geomagnetism and Earth, Planetary and Space Sciences   Magnetic field and density fluctuations associated with a CME observed during a radio occultation experiment of the solar corona

    Shota Chiba

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  2. Outstanding Student Presentation Award

    2021   Japan Geoscience Union   Physical properties of fast and slow solar wind studied by spacecraft radio scintillation

    Shota Chiba

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

 

Papers 2

  1. Observation of the Solar Corona Using Radio Scintillation with the Akatsuki Spacecraft: Difference Between Fast and Slow Wind Reviewed International coauthorship

    Shota Chiba, Takeshi Imamura, Munetoshi Tokumaru, Daikou Shiota, Takuma Matsumoto, Hiroki Ando, Hiroshi Takeuchi, Yasuhiro Murata, Atsushi Yamazaki, Bernd Häusler & Martin Pätzold

    Solar Physics   Vol. 297 ( 34 )   2022.3

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s11207-022-01968-9

  2. Probing solar wind velocity from simultaneous superior solar conjunction radio science experiments of BepiColombo and Akatsuki missions Reviewed International coauthorship

    Cappuccio, P; Imamura, T; Doria, ; Chiba, S; di Stefano, ; Shiota, D; Asmar, S; Iess, L

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 533 ( 2 ) page: 1560 - 1567   2024.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Monthly Notices of the Royal Astronomical Society  

    A radio link directly probing the inner solar corona offers the possibility to characterize solar wind properties, including velocity, density, turbulence, and even the axial ratio. In this study, we leveraged radiometric data obtained during a joint superior solar conjunction of the ESA/JAXA BepiColombo mission and the JAXA Akatsuki mission. Our objective is to ascertain the solar wind velocity by analysing Doppler-shift timeseries of radio signals exchanged between the two spacecraft and two distinct ground stations. We conducted a cross-correlation analysis to determine the travel time of large-scale plasma density fluctuations as they intersect with the downlink signals of both spacecraft. This method is applied to the data collected on 2021 March 13 and 2021 March 14. The analysis of the March 13 data has shown that the two Doppler residuals timeseries present a clear correlation at a time-lag of 2910 s. Using the knowledge of the relative distance between the two probe-ground station lines of sight at the closest approach to the Sun, we estimated the solar wind velocity to be 421 ± 21 km s−1. Following the same procedure for the second experiment, we estimated the solar wind speed velocity to be 336 ± 7 km s−1. These results are compatible with the sampling of the slow solar wind at heliographic latitudes of −22◦ and −26◦, respectively.

    DOI: 10.1093/mnras/stae1929

    Web of Science

    Scopus

KAKENHI (Grants-in-Aid for Scientific Research) 1

  1. 新たな信号解析手法と複合的観測による太陽風駆動機構の解明

    Grant number:23KJ0481  2023.4

    日本学術振興会  特別研究員奨励費 

    千葉 翔太

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\1800000 ( Direct Cost: \1800000 )