Analysis of dynamic properties of the inner magnetosphere using data assimilation

• Project/Area Number: 24740334
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Space and upper atmospheric physics
• Research Institution: The Institute of Statistical Mathematics
• Principal Investigator: Nakano Shin'ya 統計数理研究所, モデリング研究系, 助教 (40378576)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: データ同化 / リングカレント / プラズマ圏 / 内部磁気圏 / 磁気嵐 / 磁気圏 / 国際情報交換(米国) / 地球磁気圏 / 国際情報交換

Outline of Final Research Achievements

The IMAGE satellite obtained global images of energetic neutral atoms (ENAs) and extreme ultraviolet (EUV), which provide valuable information on the ring current and the plasmasphere, respectively. In this study, we have developed a data assimilation system which assimilates these two imaging data into a combined simulation model of the ring current and the plasmasphere. The data assimilation is achieved by using the ensemble transform Kalman filter. The evaluation with an artificial data set suggested that this newly-developed data assimilation system gives reasonable results.

Research Products

• [Int'l Joint Research] The Johns Hopkins University/NASA Goddard Space Flight Center(米国)
• [Journal Article] Determination of the Earth's plasmapause location from the CE-3 EUVC images (2016)
  • Author(s): F. He, X.-X. Zhang, B. Chen, M.-C. Fok, and S. Nakano
  • Journal Title: Journal of Geophysical Research Volume: 121 Issue: 1 Pages: 296-304
  • DOI: 10.1002/2015ja021863
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Formation of the oxygen torus in the inner magnetosphere: Van Allen Probes observations (2015)
  • Author(s): M. Nose, S. Oimatsu, K. Keika, C. A. Kletzing, W. S. Kurth, S. De Pascuale, C. W. Smith, R. J. MacDowall, S. Nakano, G. D. Reeves, H. E. Spence, and B. A. Larsen
  • Journal Title: Journal of Geophysical Research Volume: 120 Issue: 2 Pages: 1182-1196
  • DOI: 10.1002/2014ja020593
  • Peer Reviewed
• [Journal Article] Hybrid algorithm of ensemble transform and importance sampling for assimilation of non-Gaussian observations (2014)
  • Author(s): S. Nakano
  • Journal Title: Tellus A Volume: 66 Issue: 1 Pages: 21429-21429
  • DOI: 10.3402/tellusa.v66.21429
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Estimation of the helium ion density distribution in the plasmasphere based on a single IMAGE/EUV image (2014)
  • Author(s): S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi
  • Journal Title: Journal of Geophysical Research Volume: 119 Issue: 5 Pages: 3724-3740
  • DOI: 10.1002/2013ja019733
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Estimation of temporal evolution of the helium plasmasphere based on a sequence of IMAGE/EUV images (2014)
  • Author(s): S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi
  • Journal Title: Journal of Geophysical Research Volume: 119 Issue: 5 Pages: 3708-3723
  • DOI: 10.1002/2013ja019734
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 地球科学におけるシミュレーションとビッグデータ ─データ同化とエミュレーション─ (2014)
  • Author(s): 中野慎也，樋口知之
  • Journal Title: 電子情報通信学会誌 Volume: 97 Pages: 869-875
  • NAID: 110009864915
• [Journal Article] A prediction algorithm with a limited number of particles for state estimation of high-dimensional systems (2013)
  • Author(s): S. Nakano
  • Journal Title: Proceedings of 16th International Conference on Information Fusion Volume: 16 Pages: 1356-1363
  • Peer Reviewed
• [Journal Article] Weight adjustment of the particle filter on distributed computing systems (2012)
  • Author(s): S. Nakano
  • Journal Title: Proceedings of 15th International Conference on Information Fusion Volume: 15 Pages: 2480-2485
  • Peer Reviewed
• [Presentation] Data assimilation techniques in earth sciences (2016)
  • Author(s): S. Nakano
  • Organizer: Next Generation Transport Aircraft Workshop 2016
  • Place of Presentation: Honolulu, USA
  • Year and Date: 2016-02-22
  • Int'l Joint Research / Invited
• [Presentation] 地球磁気圏データ同化の現状と今後の展開 (2016)
  • Author(s): 中野 慎也
  • Organizer: 第6回データ同化ワークショップ
  • Place of Presentation: 横浜市
  • Year and Date: 2016-02-01
• [Presentation] 宇宙プラズマ撮像観測とデータ同化 (2016)
  • Author(s): 中野 慎也, M.-C. Fok, P. C. Brand
  • Organizer: 第71回 CAVE研究会
  • Place of Presentation: 立川市
  • Year and Date: 2016-01-14
• [Presentation] プラズマ圏データ同化の現状と今後の計画 (2015)
  • Author(s): 中野 慎也
  • Organizer: 大阪電気通信大学エレクトロニクス基礎研究所ワークショップ「プラズマ圏の観測と予測モデルの構築」
  • Place of Presentation: 寝屋川市
  • Year and Date: 2015-12-22
  • Invited
• [Presentation] Maximum likelihood approach for estimating uncertain parameters in data assimilation for a plasmasphere model (2015)
  • Author(s): S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi
  • Organizer: XXVIth IUGG General Assembly
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 2015-06-22
  • Int'l Joint Research
• [Presentation] Towards quantification of auroral properties based on image data with high temporal resolution (2015)
  • Author(s): S. Nakano and Y. Ogawa
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2015-05-24
• [Presentation] Two formulae of the marginal likelihood for parameter estimation using the ensemble Kalman filter (2015)
  • Author(s): S. Nakano
  • Organizer: The 4th International Symposium on Data Assimilation
  • Place of Presentation: 神戸市
  • Year and Date: 2015-02-23 – 2015-02-26
• [Presentation] Estimating the latitudinal dependence of plasmaspheric helium ion density based on data assimilation of the IMAGE/EUV data (2014)
  • Author(s): 中野慎也, M.-C. Fok, P. C. Brandt, 樋口知之
  • Organizer: 第136回 地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 松本市
  • Year and Date: 2014-10-31 – 2014-11-03
• [Presentation] Temporal evolution of helium ion density distribution estimated by assimilation of IMAGE/EUV data into a plasmasphere model (2014)
  • Author(s): S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi
  • Organizer: AOGS 11th Annual Meeting
  • Place of Presentation: 札幌市
  • Year and Date: 2014-07-28 – 2014-08-01
• [Presentation] Application of data assimilation approach to space physics (2014)
  • Author(s): S. Nakano
  • Organizer: The 23rd South Taiwan Statistics Conference and 2014 Chinese Institute of Probability and Statistics Annual Meeting
  • Place of Presentation: 台湾・花蓮市
  • Year and Date: 2014-06-27
• [Presentation] Data assimilation for estimating system dynamics in geosciences (2014)
  • Author(s): S. Nakano
  • Organizer: Workshop on data mining in neuroscience
  • Place of Presentation: 東京都千代田区
  • Year and Date: 2014-05-29
  • Invited
• [Presentation] Inversion method for estimating the helium ion density distribution in the plasmasphere based on IMAGE/EUV data (2014)
  • Author(s): 中野慎也, M.-C. Fok, P. C. Brandt, 樋口知之
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: 横浜市
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Comparison of two ways for representation of the forecast probability density function in ensemble-based sequential data assimilation (2013)
  • Author(s): S. Nakano
  • Organizer: EGU General Assembly 2013
  • Place of Presentation: Vienna, Austria
• [Presentation] Spatial distribution of the plasmaspheric ions estimated by assimilation of IMAGE/EUV data (2013)
  • Author(s): S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi
  • Organizer: 日本地球惑星科学連合2013年大会
  • Place of Presentation: 千葉市
• [Presentation] A prediction algorithm with a limited number of particles for state estimation of high-dimensional systems (2013)
  • Author(s): S. Nakano
  • Organizer: 16th International Conference on Information Fusion
  • Place of Presentation: Istanbul, Turkey
• [Presentation] Global distribution of the plasmaspheric ions and electric potential estimated with data assimilation of the IMAGE/EUV data (2013)
  • Author(s): S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi
  • Organizer: XIIth IAGA Scientific Assembly
  • Place of Presentation: Merida, Mexico
• [Presentation] Estimation of the plasmaspheric helium ion distribution through assimilation of the IMAGE/EUV data (2013)
  • Author(s): S. Nakano, M.-C. Fok, P. C. Brandt, and T. Higuchi
  • Organizer: AGU 2013 Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Invited
• [Presentation] Estimation of the long-term component of the variation in geomagnetic data (2012)
  • Author(s): S. Nakano and T. Higuchi
  • Organizer: EGU General Assembly 2012
  • Place of Presentation: Vienna
• [Presentation] Applicability of the particle filter for high-dimensional problems using a massively parallel computer (2012)
  • Author(s): S. Nakano and T. Higuchi
  • Organizer: EGU General Assembly 2012
  • Place of Presentation: Vienna
• [Presentation] 夜側中緯度静穏時地磁気H成分の長期変動 (2012)
  • Author(s): 中野慎也, 長尾大道，樋口知之
  • Organizer: 日本地球惑星科学連合2012年大会
  • Place of Presentation: 千葉
• [Presentation] Estimation of the spatial structure of the plasmasphere using a data assimilation technique (2012)
  • Author(s): 中野慎也, M.-C. Fok, P. C. Brandt, 樋口知之
  • Organizer: 日本地球惑星科学連合2012年大会
  • Place of Presentation: 千葉
• [Presentation] 高次元システムにおけるデータ同化のための予測分布表現法 (2012)
  • Author(s): 中野慎也
  • Organizer: 2012年度 統計関連学会連合大会
  • Place of Presentation: 札幌
• [Presentation] Two-dimensional structure of the plasmasphere estimated by the ensemble transform Kalman filter (2012)
  • Author(s): 中野慎也, M.-C. Fok, P. C. Brandt, 樋口知之
  • Organizer: 第132回 地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 札幌
• [Presentation] Hybrid approach of ensemble transform and importance sampling for nonlinear data assimilation (2012)
  • Author(s): S. Nakano and G. Ueno
  • Organizer: International Conference on Ensemble Methods in Geophysical Sciences
  • Place of Presentation: Toulouse
• [Presentation] Particle filter with a proposal distribution generated by the ensemble transform Kalman filter (2012)
  • Author(s): S. Nakano and G. Ueno
  • Organizer: AGU 2012 Fall Meeting
  • Place of Presentation: San Francisco