Researcher Database

Yukihiro Takahashi
Faculty of Science Earth and Planetary Sciences Cosmosciences
Professor

Researcher Profile and Settings

Affiliation

  • Faculty of Science Earth and Planetary Sciences Cosmosciences

Job Title

    Professor

E-mail

  • yukihiro@mail.sci.hokudai.ac.jp

URL

Research Interests

  • TLE   ELF   TGF   ISUAL   

Research Areas

  • Earth and planetary science / Space and upper atmospheric physics
  • Environmental science / Environmental dynamic analysis
  • Social/Safety system science / Natural disaster/Disaster prevention science
  • Social/Safety system science / Natural disaster science
  • Earth and planetary science / Meteorology/Physical oceanography/Hydrology
  • Earth and planetary science / Solid earth and planetary physics
  • Geography / Geography

Research Activities

Published Papers

Conference Activities & Talks

  • Next-generation Earth Monitoring System with Micro-satellites and Ground-based Networks  [Invited]
    Yukihiro Takahashi
    17th Conference of the Science Council of Asia  Manila, Philippines
  • Collaborative Promotion of Micro-satellite Utilization by International Consortium  [Invited]
    Yukihiro Takahashi
    APRSAF-17  Manila, Philippines
  • High frequency / precision disaster monitoring with micro-satellite constellation  [Invited]
    Yukihiro Takahashi
    UN World Conference on Disaster Risk Reduction 2015  Sendai, Japan
  • A Scope of Asian Micro-satellite Consortium  [Invited]
    Yukihiro Takahashi
    IEEE Workshop on Geoscience and Remote Sensing 2013  Melaka, Malaysia
  • Role and Scope of Asian Micro-satellite Consortium  [Invited]
    Yukihiro Takahashi
    34th Asia Conference on Remote Sensing “Applications of remote sensing technology on tropical peatlands”  Bali, Indonesia
  • Lifetime and structures of TLEs captured by high-speed camera on board aircraft  [Invited]
    Y. Takahashi, Y. Sanmiya, M. Sato, T. Kudo, NHK Cosmic Shore Project, Y. Yair, S. A. Cummer
    American Geophysical Union 2012 Fall Meeting  San Francisco, US
  • SPRITE-SAT mission for sprites and TGFs studies  [Invited]
    Y. Takahashi, T. Sakanoi, M. Sato, S. Kondo, K. Yoshida, Y. Sakamoto, E. Ujiie, T. Takashima, U. Inan and D. Smith
    European Geoscience Union general assembly  Vienna, Austria
  • Characteristics of TLEs observed by ISUAL/AP onboard FORMOSAT-2  [Invited]
    Y. Takahashi, T. Adachi, H. Fukunishi, S. Chikada, A. Yoshida, K. Yamamoto, R-R. Hsu, H-T. Su, A. Chen, S. B. Mende, H. U. Frey, and L-C. Lee
    American Geophysical Union (AGU) 2006 Fall meeting  San Francisco, US
  • Optical characteristics of elves observed by FORMOSAT-2/ISUAL and properties of parent lightning discharges  [Invited]
    Y. Takahashi, T. Adachi, A. Ohkubo, K. Yamamoto, S. Chikada, H. Fukunishi, H. _T. Su, A. B. Chen, R. _R. Hsu, S. B. Mende, H. U. Frey, L. C. Lee
    International Association of Meteorology and Atmospheric Sciences (IAMAS) 2005 meeting  Beijing, China

MISC

  • SHOJI Yasuhiro, TAGUCHI Makoto, NAKANO Toshihiko, MAEDA Atsunori, TAKAHASHI Yukihiro, IMAI Masataka, NAKAMOTO Junpei, WATANABE Makoto, GODA Yuya, KAWAHARA Takeshi, YOSHIDA Kazuya, SAKAMOTO Yuji  JAXA research and development report  13-  87  -105  2014/03   [Not refereed] [Not invited]  
    Seeing is the most important condition for high spatial resolution optical imaging by a ground-based telescope. The stable wind and low atmospheric density in the stratosphere provide ideal environment for optical observations of celestial objects. Taking advantages of the stratospheric environment even a small telescope with a sub-meter diameter main mirror can realize high spatial resolution imaging comparable to those by huge ground-based telescopes with a several-meter diameter. The circumpolar balloon-borne telescope, FUJIN, is a telescope floating in the polar stratosphere for optical observations of planets. Since the FUJIN was proposed in 2002, the flight system has been developed. The first flight test was conducted in 2009 to be failed due to hung-up of the onboard CPU. Improvement and further development has been continued, and then the FUJIN-1 flight model was rolled out in 2013. Unfortunately the flight experiment in 2013 was canceled due to the bad wind condition and some troubles in the balloon control system, respectively. However the functions of the FUJIN-1 were evaluated in the ground tests, and the flight model stood by as`flight ready.'In the tests the pointing control system of the telescope, which is the key mechanism for the FUJIN-1, was tested and evaluated to be capable of suppressing the pointing error within 0.4"(σ) which is smaller than the diffraction limit of the FUJIN-1 main telescope. From these results it has been decided that the development of the FUJIN-1 has been completed, and the development of the FUJIN-2, the flight system for longer flight duration in the northern polar region has been started. In this article the outline of the FUJIN project, the FUJIN-1 flight system and the ground test results of the pointing control functionality are introduced.
  • TAKAHASHI Yukihiro  Journal of plasma and fusion research  90-  (2)  128  -131  2014/02   [Not refereed] [Not invited]  
    最近,太陽自転周期である27日程度の大気変動がみつかっている.ここでは特に西太平洋における雲変動に焦点を当てて紹介する.従来,11年周期についての調査は多くなされてきたが,それらは振幅が小さく,測定誤差の問題が指摘されているが,1ヶ月程度の周期変動は振幅が数10%を超えることもある.本節では,全球の積乱雲活動の指標であるシューマン共鳴現象と,衛星から観測される雲の変動が,共に太陽極大期のみ27日の周期性を示すことを紹介する.また,太陽振幅ではなく,周期が11年周期の太陽活動に関連していることを指摘し,それがエルニーニョなどより長い時間変動に影響している可能性を議論する.
  • TAKAHASHI Yukihiro  Journal of plasma and fusion research  90-  (2)  137  -140  2014/02   [Not refereed] [Not invited]  
    積乱雲による発電を駆動源とし,地面と電離圏が成す巨大な球殻コンデンサーを基本構造とし,磁気圏・電離圏電流とも結合している可能性のある地球規模の電流回路-全地球回路(グローバルサーキット)-は,その仮説提唱から80年以上経つ今も十分定量的な理解に至っていない.しかし,その回路で運ばれるイオンや電場は,雲の生成・発達・消滅や雲頂高度に作用し,気候変動にも関与している可能性が指摘されている.
  • Yamashita Kozo, Takahashi Yukihiro, Matsumoto Jun, Hamada Jun-ichi  Proceedings of the Society Conference of IEICE  2013-  (1)  2013/09   [Not refereed] [Not invited]
  • Takahashi Y.  Planetary People  21-  (3)  2012/09   [Not refereed] [Not invited]
  • Takahashi Y., Sato M., Fukuhara T., Kurihara J., Nakajima K.  Planetary People  21-  (3)  224  -228  2012/09   [Not refereed] [Not invited]  
    近年,木星大気の大規模構造を決める力学や,大気組成を決める化学過程を理解する上で,積乱雲や雷放電観測の重要性が指摘されている.しかし,対流強度は雲頂高度など雲本体の観測のみからでは難しい.雷放電発光の強度,頻度,高度の情報はそれを補う優れた指標のひとつであるが,通常のカメラでは時間分解能が不十分で,積乱雲活動の定量的な評価は困難である.ここで提案する雷放電発光検出器"OLD"は,高速撮像・画像処理によって雷放電発光の頻度から対流活動強度を求め,また色情報から高度推定することを可能にする.
  • Yamashita Kozo, Ohya Hiroyo, Tsuchiya Fuminori, Takahashi Yukihiro, Matsumoto Jun  Proceedings of the Society Conference of IEICE  2012-  (1)  2012/08   [Not refereed] [Not invited]
  • YOSHIDA Kazuya, SAKAMOTO Yuji, KUWAHARA Toshinori, TAKAHASHI Yukihiro  計測と制御 = Journal of the Society of Instrument and Control Engineers  51-  (5)  438  -443  2012/05   [Not refereed] [Not invited]
  • KIMURA Shinichi, NAKASUKA Shinichi, GOUDA Naoteru, YAMAMOTO Masaya, IWASAKI Akira, KURAHARA Naomi, YOSHIDA Kazuya, TAKAHASHI Yukihiro  Journal of the Japan Society for Aeronautical and Space Sciences  60-  (4)  137  -148  2012/04   [Not refereed] [Not invited]  
    近年,従来の数トン級衛星ではなく,100〜500kgの「小型衛星」が世界各国の地図作成,安全保障,防災,都市計画,自然環境・気象観測,農産物の生産管理,科学調査等の様々な分野に利用され,また,大学・研究機関・企業等の宇宙利用のニーズが高まってきた.こうした状況に合わせ,日本航空宇宙学会誌では計測自動制御学会誌と共同特集企画として,主に超小型衛星の利用に焦点を当てた特集「小型衛星を用いたセンシングアプリケーション」を掲載することとした.日本航空宇宙学会誌では,計測自動制御学会の特集号に先立ち,その特集号にて掲載される内容をダイジェスト版として紹介する.
  • Ohtani E., Kuramoto K., Imamura T., Terada N., Watanabe S., Arakawa M., Ito T.  Planetary People  20-  (4)  349  -365  2011/12   [Not refereed] [Not invited]  
    「月惑星探査の来たる10年」検討では第一段階で5つのパネルの各分野に於ける第一級の科学について議論した.そのとりまとめを報告する.地球型惑星固体探査パネルでは,月惑星内部構造の解明,年代学・物質科学の展開による月惑星進化の解明,固体部分と結合した表層環境の変動性の解明,が挙げられた.地球型惑星大気・磁気圏探査パネルは複数学会に跨がる学際性を考慮して,提案内容に学会間で齟齬が生じないように現在も摺り合わせを進めている.本稿では主たる対象天体を火星にしぼって第一級の科学を論じる.小天体パネルでは始原的・より未分化な天体への段階的な探査と,発見段階から理解段階へ進むための同一小天体の再探査が提案された.木星型惑星・氷衛星・系外惑星パネルは広範な科学テーマの中から,木星の大気と磁気圏探査,氷衛星でのハビタブル環境の探査,系外惑星でも生命存在可能環境と生命兆候の発見について具体的な議論を行った.アストロバイオロジーパネルでは現実的な近未来の目標として火星生命探査を,長期的な目標として氷衛星・小天体生命探査を目指した観測装置開発が検討された.これらのまとめを元に「月惑星探査の来たる10年」検討は2011年7月より第二段階に移行し,ミッション提案・観測機器提案の応募を受け付けた.
  • TAKAHASHI Yukihiro, FUKUHARA Tetsuya, KURIHARA Junichi  Technical report of IEICE. SANE  111-  (239)  33  -35  2011/10   [Not refereed] [Not invited]  
    New types of remote-sensing sensors for 50-kg class micro-satellite have been developed at Hokkaido University, a member of UNIFORM and Hodoyoshi projects promoted by Japanese government. In those sensors, advanced devices, materials or techniques, such as liquid crystal tunable filter, commercial-based bolometer array, zero-expansion ceramic mirror, grinding process for the ceramic mirror are applied for the first time. Also, in this presentation, applications of the sensors to remote-sensing of the Earth are introduced.
  • SAKAMOTO Yuji, KUWAHARA Toshinori, YOSHIDA Kazuya, TAKAHASHI Yukihiro  Mechanical Engineering Congress, Japan  2011-  "S192025  -1"-"S192025-3"  2011/09   [Not refereed] [Not invited]  
    The development of 50-kg class microsatellite RISING-2 was started in July, 2009 by Tohoku Univ. and Hokkaido Univ. At the time of May, 2011, the fabrication and evaluation tests of engineering model (EM) and the fabrication of flight model (FM) were finished. The launch opportunity has been not decided yet. The satellite has a telescope with 10-cm diameter and 1-m focal length, and the resolution of image is 5 meters. It observes multi-spectrum images of cumulonimbus clouds using liquid crystal tunable filter as well as RGB color photos. Also, transient luminous events in upper atmosphere such as sprite are observed using CMOS sensors. This paper shows the final specifications of FM, and the verification tests of bus system.
  • Sakamoto Yuji, Kuwahara Toshinori, Yoshida Kazuya, Takahashi Yukihiro  スペース・エンジニアリング・コンファレンス講演論文集 : Space Engineering Conference  2010-  (19)  "F3  -1"-"F3-6"  2011/01   [Not refereed] [Not invited]  
    Tohoku University and Hokkaido University started the development of a new 50-kg microsatellite RISING-2 at July 2009. This satellite inherits the development technique of RISING (SPRITE-SAT) launched on January 2009. The progress is shown in this paper. Using a Cassegrain telescope with 10-cm diameter and 1-m focal length, earth surface is observed with 5-m resolution from 700-km-alt sun synchronous orbit. By 3-axis attitude stabilization using reaction wheels and star sensors, the designated area on earth surface can be observed. In addition to color images, multi-spectrum images of cumulonimbus are observed by using a liquid crystal tunable filter. As a secondary mission, transient luminous events such as sprite are observed, which is same mission as SPRITE-SAT.
  • USHIO Tomoo, SATO Mitsuteru, MORIMOTO Takeshi, SUZUKI Makoto, KIKUCHI Hiroshi, YAMAZAKI Atsushi, TAKAHASHI Yukihiro, HOBARA Yasuhide, INAN Umran, LINSCOTT Ivan, SAKAMOTO Yuji, ISHIDA Ryohei, KIKUCHI Masayuki, YOSHIDA Kazuya, KAWASAKI Zen-Ichiro  IEEJ Transactions on Fundamentals and Materials  131-  (1)  16  -20  2011/01   [Not refereed] [Not invited]  
    Lightning and sprite measurement sensors on the International Space Station (ISS) are introduced in this paper. Lightning is an electrical discharge which neutralizes the charge inside thunderstorm. In the early 1990s, optical transient luminous events (TLEs) occurring just above the thunderstorm were firstly reported by the US scientists and are associated with positive cloud-to-ground discharges with a large amount of charge. Though the luminous events so-called sprite, elves and jets have been investigated by numerous researchers all over the world based mainly on the ground observations, some important problems have not been fully understood yet such as generation mechanisms of columniform fine structure and horizontal offset of some sprites from the parent lightning discharges. In the JEM-GLIMS mission, observations from our synchronized sensors are going to shed light on above-mentioned unsolved problems regarding TLEs as well as causative lighting discharges. Our goals are (1) to detect and locate lightning and sprite within storm scale resolution over a large region of the Earth's surface along the orbital track of the ISS without any bias, (2) to clarify the generation mechanism of sprite, and (3) to identify the occurrence conditions of TLEs.
  • USHIO Tomoo, SATO Mitsuteru, MORIMOTO Takeshi, SUZUKI Makoto, KIKUCHI Hiroshi, YAMAZAKI Atsushi, TAKAHASHI Yukihiro, HOBARA Yasuhide, INAN Umran, ISHIDA Ryohei, KAWASAKI Zen-Ichiro  電気学会研究会資料. EMC, 電磁環境研究会  2010-  (29)  1  -4  2010/11   [Not refereed] [Not invited]
  • Yoshida Kazuya, Shoji Yasuhiro, Sakamoto Yuji, Taguchi Makoto, Takahashi Yukihiro  Proceedings of the IEICE General Conference  2010-  (1)  "SS  -78"-"SS-79"  2010/03   [Not refereed] [Not invited]
  • TAGUCHI Makoto, SHOJI Yasuhiro, SAKAMOTO Yuji, YOSHIDA Kazuya, TAKAHASHI Yukihiro, TERAGUCHI Tomoko, OHNISHI Tomoya, BATTAZZO Steve, SATO Takao, HOSHINO Naoya, UNO Takeru, YOSHIMURA Atsushi  JAXA research and development report  9-  53  -72  2010/03   [Not refereed] [Not invited]  
    A long-term continuous observation is essential for studies of time-dependent phenomena of the planetary atmospheres and plasmas. A balloon-borne telescope system has been developed for remote sensing of the planets from the polar stratosphere. In this system, a Schmidt-Cassegrain telescope with a 300-mm clear aperture is mounted on a gondola whose attitude is controlled by control moment gyros, an active decoupling motor, and attitude sensors. The gondola can float in the stratosphere for periods in excess of 1 week. A pointing stability of 0.1"rms will be achieved by the cooperative operation of the following three-stage pointing devices: a gondola-attitude control system, twoaxis telescope gimbals for coarse guiding, and a tip/tilt mirror mount for guiding error correction. The first experiment of the balloon-borne telescope system was conducted on June 3, 2009 in Taikicho, Hokkaido targeting Venus. The balloon was launched at 4:10 JST and the system has been operating perfectly for two hours after launch. During the first level flight at an attitude of 14 km attitude control was activated. Oscillation of the azimuthal angle of the gondola was damped at an expected rate and the gondola was stabilized within an error of 1?rms for a several minutes. Unfortunately capture of Venus images by the telescope was aborted because of failure in the onboard computer occurred at two hours after launch. However, from the video signal from the Sun sensor azimuthal angular velocity of the free gondola is estimated to be 20°/min or slower. These results from the experiments including the ground-based tests suggest that the basic system concept of the balloon-borne telescope, especially the attitude control and tracking technology, is correct. A more robust and a dependable onboard computer is required for a future experiment.
  • Takahashi Yukihiro, Hoshino Naoya  Planetary People  18-  (4)  238  -241  2009/12   [Not refereed] [Not invited]  
    金星における世界初の雷放電観測専用機能と微弱大気光の検出能力を兼ね備えた雷・大気光カメラLACは,ハードウェアの製作・各種試験が完了し,実地観測に備えたパラメータ設定と詳細シーケンスの検討に入った.LACの科学的背景と目標,設計方針,これまで行った試験などについて紹介する.
  • Imamura Takeshi, Kasai Yasuko, Sagawa Hideo, Kuroda Takeshi, Satoh Takehiko, Ueno Munetaka, Suzuki Makoto, Takahashi Yukihiro, Takahashi Yoshiyuki, Hashimoto George L., Kuramoto Kiyoshi  Planetary People  18-  (2)  76  -78  2009/06   [Not refereed] [Not invited]  
    火星表層の水循環や気象学の理解を目的とする火星周回衛星の検討を進めている.可視〜赤外域での高解像度の分光撮像による水蒸気マッピングと大気力学場モニター,そしてサブミリ波サウンダーによる水蒸気やその他微量ガスの3次元分布の観測が,二つの柱である.着陸機による局地気象の直接観測や大気電気観測との連携についても検討中である.
  • TAKAHASHI Yukihiro, KURAMOTO Kiyoshi  Planetary People  9-  (1)  33  -46  2000/03   [Not refereed] [Not invited]

Educational Activities

Teaching Experience

  • Inter-Graduate School Classes(General Subject):Natural and Applied Sciences
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 環境汚染、環境修復、環境毒性学、資源開発、環境経済
  • Special Lecture of Cosmosciences 1
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 理学院
    キーワード : Remote-sensing, Asia, Micro-satellite, Drone, Optical payload
  • Inter-Graduate School Classes(General Subject):Natural and Applied Sciences
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
  • Advanced Course on Planetary Systems 2
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 理学院
    キーワード : 地球惑星大気,宇宙空間,惑星探査, 光学計測
  • Earth and Planetary Electromagnetism
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 理学部
    キーワード : 地球内部の電磁気構造,岩石磁気,地磁気,大気科学,プラズマ,電磁流体力学,電磁圏
  • Environment and People
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 太陽系,地球型(内)惑星,外惑星,惑星大気,オーロラ,星間物質, 天文学、宇宙の進化
  • Basic Earth and Planetary Science Ⅱ
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 宇宙,惑星,大気と海洋の運動と構造,気候変動,地球環境


Copyright c MEDIA FUSION Co.,Ltd. All rights reserved.