エルニーニョ気候変動に対する超高層大気の応答とそのメカニズムの解明

2015 Fiscal Year Research-status Report

• Project/Area Number: 15K05301
• Research Institution: Kyushu University
• Principal Investigator: フイシン リュウ 九州大学, 国際宇宙天気科学・教育センター, 准教授 (70589639)
• Co-Investigator(Kenkyū-buntansha): 三好 勉信 九州大学, 理学(系)研究科(研究院), 准教授 (20243884) ; 藤原 均 成蹊大学, 理工学部, 教授 (50298741)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 大気圏ー熱圏結合

Outline of Annual Research Achievements

本研究は、顕著な気候変動をもたらすエルニーニョ南方振動の超高層大気への影響を明らかにすることを目的としている。平成２７年度に、過去５０年間の熱圏密度観測を分析し、エルニーニョ南方振動による変動があることを明らかにした。具体的に、熱圏密度は人工衛星による長期観測を、エルニーニョ南方振動は気象庁が提供しているニーニョ指数を用いて、両者の相関をスペクトル分析などによって、明らかにした。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

データの事前準備などができたので、順調に進展することができた

Strategy for Future Research Activity

今後は数値モデルでシミュレーションをし、その結果の分析、観測との比較をおこなう。

Research Products

• [Journal Article] Modifications of the ionosphere prior to large earthquakes: report from the ionosphere precursor study group (2016)
  • Author(s): Oyama, K.-I., M. Devi, K. Ryu, C. H. Chen, J. Y. Liu, Huixin Liu, L. Bankov, T. Kodama
  • Journal Title: Geosci. Lett Volume: 3 Pages: 1-10
  • DOI: 10.1186/s40562-016-0038-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Alfve waves as a solar-interplanetary driver of the thermospheric disturbancesurbancesurbances (2016)
  • Author(s): Guo, J., F. Wei, X. Feng, Huixin Liu, W. Wan, Z. Yang, J. Yao, and C. Liu
  • Journal Title: Scientific Reports Volume: 6 Pages: 1-7
  • DOI: 10.1038/srep-18895
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Precursory enhancement of EIA in the morning sector: contribution from Mid-latitude large earthquake in the north-east Asian region (2016)
  • Author(s): Ryu, K., K. Oyama, L. Bankov, C. Chen, M. Devi, Huixin Liu, J. Liu
  • Journal Title: Adv. in Space. Res Volume: 57 Pages: 268-280
  • DOI: http://dx.doi.org/10.1016/j.asr.2015.08.030
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Observations of a large-scale gravity wave propagating over an extremely large horizontal distance in the thermosphere (2015)
  • Author(s): Guo, J., J. Forbes, F. Wei, X. Feng, Huixin Liu, W. Wan, Z. Yang, and C. Liu, B. Amery, Y. Deng
  • Journal Title: Geophys. Res. Lett Volume: 42 Pages: 6560-6565
  • DOI: 10.1002/2015GL065671
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Empirical model of equatorial electrojet based on ground-based magnetometer data during solar minimum in fall (2015)
  • Author(s): Hamid, N. S. A., Huixin Liu, T. Uozumi
  • Journal Title: Earth. Planets and Space Volume: 67 Pages: 1-8
  • DOI: 10.1186/s40623-015-0373-1
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Longitudinal and Solar Activity Dependence of Equatorial Electrojet At Southeast Asian Sector (2015)
  • Author(s): Hamid, N. S. A., Huixin Liu, T. Uozumi, G. K. Gopir, H. A. Hadin, A. Yoshikawa
  • Journal Title: IEEE Proc. of the 2015 IconSpace Volume: 30 Pages: 262-266
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Capacity building: A tool for advancing space weather science (2015)
  • Author(s): Cardinal, M. G., A. Yoshikawa, H. Kawano, Huixin Liu, M. Watanabe, S. Abe, T. Uozumi, G. Maeda, T. Hada, K. Yumoto
  • Journal Title: Space Weather Quarterly Volume: 20 Pages: 16-20
  • DOI: 10.1002/2014SW001110
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations (2015)
  • Author(s): Miyoshi, Y., S. Oyama, S. Saito, S. Kurita, H. Fujiwara, R. Kataoka, Y. Ebihara, C. Kletzing, G. Reeves, O. Santolik, M. Clilverd, C. J. Rodger, E. Turunen, and F. Tsuchiya
  • Journal Title: J. Geophys. Res Volume: 1 Pages: 1
  • DOI: 10.1002/2014JA020690
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A case study on generation mechanisms of a sporadic sodium layer above Tromso (69.6° N) during a night of high auroral activity (2015)
  • Author(s): Takahashi, T., S. Nozawa, T. T. Tsuda, Y. Ogawa, N. Saito, T. D. Kawahara, C. Hall, H. Fujiwara, N. Matsuura, A. Brekke, M. Tsutsumi, S. Wada, T. Kawabata, S. Oyama, and R. Fujii
  • Journal Title: Ann. Geophys Volume: 33 Pages: 941-953
  • DOI: 10.5194/angeo-33-941-2015
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Thermosphere inter-annual variability potentially due to ENSO (2015)
  • Author(s): Liu Huixin
  • Organizer: AGU2015
  • Place of Presentation: San Francisco, US
  • Year and Date: 2015-12-14 – 2015-12-18
  • Int'l Joint Research
• [Presentation] Inter-annual variability in the thermosphere (2015)
  • Author(s): Liu Huixin
  • Organizer: SGEPSS2015
  • Place of Presentation: Tokyo
  • Year and Date: 2015-10-31 – 2015-11-03
• [Presentation] Thermosphere response to stratosphere sudden warming simulated by GAIA (2015)
  • Author(s): Liu Huixin
  • Organizer: ISEA14
  • Place of Presentation: Bahir Dar, Ethiopia
  • Year and Date: 2015-10-19 – 2015-10-23
  • Int'l Joint Research / Invited
• [Presentation] Thermosphere response to external forcing: decadal observations from CHAMP (2015)
  • Author(s): Liu Huixin
  • Organizer: MTI2015
  • Place of Presentation: NICT, Tokyo
  • Year and Date: 2015-08-31 – 2015-09-02
  • Invited
• [Presentation] Periodic Variations in the Thermospheric Density (2015)
  • Author(s): Liu Huixin
  • Organizer: AOGS
  • Place of Presentation: Singapore
  • Year and Date: 2015-08-02 – 2015-08-07
  • Int'l Joint Research
• [Presentation] Thermosphere response to stratosphere sudden warming simulated by GAIA (2015)
  • Author(s): Liu Huixin
  • Organizer: CEDAR2015
  • Place of Presentation: Seattle
  • Year and Date: 2015-06-21 – 2015-06-25
  • Int'l Joint Research / Invited
• [Presentation] Thermosphere inter-annual variability due to lower atmosphere climate change (2015)
  • Author(s): Liu Huixin
  • Organizer: JPGU 2015
  • Place of Presentation: Makuhari, Chiba
  • Year and Date: 2015-05-24 – 2015-05-28
  • Int'l Joint Research