Study on the polar wind in the polar cap using the EISCAT radar

• Project/Area Number: 18740310
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Space and upper atmospheric physics
• Research Institution: National Institute of Polar Research
• Principal Investigator: OGAWA Yasunobu National Institute of Polar Research, 研究教育系, 講師 (00362210)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,600,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥300,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2007: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
• Keywords: 極風 / 電離圏 / 極冠域 / イオン流出 / ロングイアビン

Research Abstract

本研究課題の目的は、極域電離圏及び磁気圏で観測される極風(ポーラーウィンド)の生成機構の解明である。極風が生じ始めると考えられる極冠域の上部電離圏(400-1,000km)におけるイオン組成の高度分布と各イオン種の速度分布を、2007年夏期から2008年冬期にかけて実施した欧州非干渉散乱(EISCAT)スヴァールバルレーダー(ESR)観測データを用いて調べた結果、(1)酸素イオンに対する水素イオンの比率は、電離圏モデル(IRI-2001)値に比べて観測値の方が大きいこと(高度400-600kmでは約3倍)、(2)昼側カスプ領域より低緯度側の領域では、主イオンである酸素イオンとマイナーイオンである水素イオンにより、全上昇イオンフラックスの保存が広い高度幅で成り立っていること、等を明らかにした。

Research Products

• [Journal Article] Characteristics of ion upflow and downflow observed with the European Incoherent Scatter Svalbard radar (2009)
  • Author(s): Y. Ogawa, S. C. Buchert, R. Fujii, S. Nozawa, and A. P. van Eyken
  • Journal Title: J. Geophys. Res. vol.114,A05305
  • Peer Reviewed
• [Journal Article] Characteristics of ion upflow and downflow observed with EISCAT Svalbard radar (2009)
  • Author(s): Y. Ogawa, S. C. Buchert, R. Fujii, S. Nozawa, and A. P. van Eyken
  • Journal Title: J. Geophys. Res. 114
  • Peer Reviewed
• [Journal Article] Acceleration mechanism of high-speed neutral wind obseryed in the polar lower thermosphere (2009)
  • Author(s): T. T. Tsuda, S. Nozawa, S. Oyama, T. Motoba, Y. Ogawa, H. Shinagawa, N. Nishitani, K. Hosokawa, N. Sato, M. Lester, and R. Fujii
  • Journal Title: J. Geophys. Res. 114
  • Peer Reviewed
• [Journal Article] Coordinated EISCAT Svalbard radar and Reimei satellite observations of ion upflows and suprathermal ions (2008)
  • Author(s): Y. Ogawa, K. Seki, M. Hirahara, K. Asamura, T. Sakanoi, S. C. Buchert, Y. Ebihara, Y. Obuchi, A. Yamazaki, I. Sandahl, S. Nozawa, and R. Fujii
  • Journal Title: J. Geophys. Res. vol.113,A05306
  • Peer Reviewed
• [Journal Article] Ion-dispersion and rapid electron fluctuations in the cusp : a case study (2008)
  • Author(s): J. Lunde, S. C. Buchert, Y. Ogawa, M. Hirahara, K. Seki, Y. Ebihara, T. Sakanoi, K. Asamura, M. Okada, T. Raita, and I. Haggstrom
  • Journal Title: Ann. Geophys. 26 Pages: 2485-2502
  • Peer Reviewed
• [Journal Article] Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance (2008)
  • Author(s): S. Oyama, B. J. Watkins, S. Maeda, H. Shinagawa, S. Nozawa, Y. Ogawa, A. Brekke, C. Lathuillere. and W. Kofman
  • Journal Title: Annales Geophysicae 26 Pages: 1491-1505
  • Peer Reviewed
• [Journal Article] Coordinated EISCAT Svalbard radar and Reimei satellite observations of ion upflows and suprathermal ions (2008)
  • Author(s): Y. Ogawa, K. Seki, M. Hirahara, K. Asamura, T. Sakanoi, S. C. Buchert, Y. Ebihara, Y. Obuchi, A. Yamazaki, I. Sandahl, S. Nozawa, and R. Fujii
  • Journal Title: J. Geophys. Res. 113
  • Peer Reviewed
• [Journal Article] SERSIO : Svalbard EISCAT Rocket Study of Ion Outflows (2007)
  • Author(s): K. M. Frederick-Frost, K. A. Lynch, P. M. Kintner Jr., E. Klatt, D. Lorentzen, J. Moen, Y. Ogawa, M. Widholm
  • Journal Title: J. Geophys. Res. vol.112,A08307
  • Peer Reviewed
• [Journal Article] Pulsating dayside aurora in relation to ion upflow events during a northward IMF dominated by a strongly negative IMF BY (2007)
  • Author(s): D. A. Lorentzen, P.M., Kintner, J. Moen, F. Sigernes, K. Oksavik, Y. Ogawa, and J. Holmes
  • Journal Title: J. Geophys. Res. vol.112,A03301
  • Peer Reviewed
• [Journal Article] Energy Input from the Exterior Cusp into the Ionosphere : Correlated Ground-Based and Satellite Observations (2007)
  • Author(s): E. Yordanova, D. Sundkvist, S. Buchert, M. Andre, Y. Ogawa, M. Morooka, O. Margithu, O. Amm A. N. Fazekerley, and H. Reme
  • Journal Title: Geophys. Res. Lett. vol.34,L04102
  • Peer Reviewed
• [Journal Article] SERSIO: Svalbard EISCAT Rocket Study of Ion Outflows (2007)
  • Author(s): K. M. Frederick-Frost, K. A. Lynch, P. M. Kintner Jr., E. Klatt, D. Lorentzen, J. Moen, Y. Ogawa, M. Widholm
  • Journal Title: J. Geophys. Res. 112
  • Peer Reviewed
• [Journal Article] Particle Precipitations during NEIAL events: Simultaneous Ground Based Observations at Svalbard (2007)
  • Author(s): J. Lunde, B. Gustavsson, U. P. Lovhaug, D. A. Lorentzen and Y. Ogawa
  • Journal Title: Ann. Geophysicae 25 Pages: 1323-1336
  • Peer Reviewed
• [Journal Article] Pulsating dayside aurora in relation to ion upflow events during a northward IMF dominated by a strongly negative IMF BY (2007)
  • Author(s): D.A.Lorentzen, P.M., Kintner, J.Moen, F.Sigernes, K.Oksavik, Y.Ogawa, J.Holmes
  • Journal Title: J. Geophys. Res. 112
• [Journal Article] TRANS4 : a new electron/proton transport code - Application to the 22-01-2004 geophysical event (2007)
  • Author(s): C.Simon, J.Lilensten, J.Moen, J.Holmes, Y.Ogawa, K.Oksavik, W.F.Denig
  • Journal Title: Annales Geophysicae 25 Pages: 661-673
• [Journal Article] Naturally enhanced ion-acoustic lines at high altitudes (2006)
  • Author(s): Y. Ogawa, S. C. Buchert, R. Fujii, S. Nozawa, and F. Forme
  • Journal Title: Ann. Geophys. vol.24 Pages: 3351-3364
  • Peer Reviewed
• [Journal Article] Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail (2006)
  • Author(s): O. Amm, R. Nakamura, H. U. Frey, Y. Ogawa, M. Kubyshikina, A. Balogh, and H. Reme
  • Journal Title: Ann. Geophys. vol.24 Pages: 735-750
  • Peer Reviewed
• [Journal Article] Naturally enhanced ion-acoustic lines at high altitudes (2006)
  • Author(s): Y.Ogawa, S.C.Buchert, R.Fujii, S.Nozawa, F.Forme
  • Journal Title: Annales Geophysicae 24 Pages: 3351-3364
• [Presentation] EISCATレーダーを用いた日本の極域超高層大気観測の現状(招待講演) (2008)
  • Author(s): 小川泰信,宮岡宏,藤井良一,野澤悟徳,大山伸一郎,平原聖文,坂野井健,阿部琢美,小野高幸,細川敬祐,門倉昭,行松彰
  • Organizer: 第122回地球電磁気・地球惑星圏学会
  • Place of Presentation: 仙台
  • Year and Date: 2008-10-09
• [Presentation] EISCATレーダーを用いた日本の極域超高層大気観測の現状 (2008)
  • Author(s): 小川泰信, 宮岡宏, 藤井良一, 野澤悟徳, 大山伸一郎, 平原聖文, 坂野井健, 阿部琢美, 小野高幸, 細川敬祐, 門倉昭, 行松彰
  • Organizer: 第102回地球電磁気・地球惑星圏学会
  • Place of Presentation: 仙台
  • Year and Date: 2008-10-09
• [Presentation] EISCATスヴァールバルレーダーを用いた極冠域電離圏における極風の観測的研究 (2008)
  • Author(s): 小川泰信、麻生武彦、宮岡宏、藤井良一、野澤悟徳、大山伸一郎、平原聖文、I. Haggstrom、A. Westman
  • Organizer: 第32回極域宙空圏シンポジウム
  • Place of Presentation: 国立極地研究所
• [Presentation] 人工衛星-地上光学機器-レーダー総合観測による夜側オーロラ帯で発生するイオン上昇流とオーロラとの関係 (2008)
  • Author(s): 小川泰信、平原聖文、関華奈子、麻生武彦、浅村和史、坂野井健、山崎敦、I. Sandahl、S. C. Buchert、藤井良一、野澤悟徳、大山伸一郎、栗原宜子、津田卓雄、岩田陽介、門倉昭、細川敬祐、宮岡宏
  • Organizer: 地球惑星科学関連学会2006年合同大会
  • Place of Presentation: 幕張メッセ国際会議場
• [Presentation] Relationship between ion upflows and suprathermal ions observed with the EISCAT Svalbard radar and Reimei satellite (2008)
  • Author(s): Y. Ogawa, K. Seki, M. Hirahara, K. Asamura, T. Sakanoi, Y. Ebihara, Y. Obuchi, S. C. Buchert, I. Sandahl, S. Nozawa, and R. Fujii
  • Organizer: SCAR/IASC IPY Open Science Conference
  • Place of Presentation: St. Petersburg, Russia
• [Presentation] EISCATスヴァールバルレーダーを用いた極冠域電離圏における極風の観測的研究 (2007)
  • Author(s): 小川泰信,麻生武彦,藤井良一,野澤悟徳,大山伸一郎,平原聖文,S. C. Buchert, I. Haggstrom, A. Westman, and M. Langteigen
  • Organizer: 第120回地球電磁気・地球惑星圏学会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2007-09-29
• [Presentation] サブストーム時における極域電離圏イオン上昇流の時間・空間変化 (2007)
  • Author(s): 小川泰信、澤津橋磨由子、野澤悟徳、藤井良一
  • Organizer: 第120回地球電磁気・地球惑星圏学会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2007-09-29
• [Presentation] サブストーム時における極域電離圏イオン上昇流の時間・空間変化 (2007)
  • Author(s): 小川泰信、澤津橋磨由子、野澤悟徳、藤井良一
  • Organizer: 第31回極域宙空圏シンポジウム
  • Place of Presentation: 国立極地研究所
  • Year and Date: 2007-07-24
• [Presentation] Solar activity dependence of ion upflow in the polar ionosphere (2007)
  • Author(s): Y. Ogawa, S. C. Buchert, A. Sakurai, S. Nozawa, and R. Fujii
  • Organizer: CAWSES/IHY workshop
  • Place of Presentation: 名古屋大学野依記念学術交流館カンファレンスホール
• [Presentation] Relationship between ion upflows and suprathermal ions observed with the EISCAT Svalbard radar and Reimei satellite (2007)
  • Author(s): Y. Ogawa, K. Seki, M. Hirahara, K. Asamura, T. Sakanoi, Y. Ebihara, Y. Obuchi, S. C. Buchert, I. Sandahl, S. Nozawa, and R. Fujii
  • Organizer: The 13th International EISCAT Workshop
  • Place of Presentation: Mariehamn, Finland
• [Presentation] Solar activity dependence of ion upflow in the polar ionosphere (2007)
  • Author(s): Y. Ogawa, S. C. Buchert, A. Sakurai, S. Nozawa, and R. Fujii
  • Organizer: International CAWSES Symposium
  • Place of Presentation: Kyoto University
• [Presentation] EISCATレーダーによるイオン上昇流観測の現状と今後(招待講演) (2006)
  • Author(s): 小川泰信、その他
  • Organizer: 第118回地球電磁気・地球惑星圏学会「特別セッション : 地上-衛星観測・データ解析・モデリングの統合型ジオスペース研究に向けて」
  • Place of Presentation: 相模原市民会館
  • Year and Date: 2006-11-05
• [Presentation] EISCATレーダーによる高高度/高時間分解能/高空間分解能観測手法について (2006)
  • Author(s): 小川泰信、I. Haggstrom、A. Westman
  • Organizer: STE研究集会「リモートセンシングによる極域電離圏・磁気圏プラズマの動態の解明」
  • Place of Presentation: 豊川市民プラザ
  • Year and Date: 2006-09-27
• [Presentation] Coordinated Reimei and EISCAT observations of ion upflows in the polar ionosphere(招待講演) (2006)
  • Author(s): Y. Ogawa, M. Hirahara, T. Sakanoi, K. Asamura, K. Seki, S. Nozawa, R. Fujii, S. Buchert, Y. Kasaba, Y. Obuchi, T. Ino, and A. Yamazaki
  • Organizer: AOGS 2006 meeting
  • Place of Presentation: Singapore
• [Presentation] Current and future EISCAT observations of ion upflows in the polar ionosphere, Future Perspectives of Space Plasma and Particle Instrumentation and International Collaborations, Multipurpose Conference Hall (2006)
  • Author(s): Y. Ogawa et al.
  • Organizer: Tachikawa Memorial Buildin Rikkyo University
  • Place of Presentation: Tokyo, Japan
• [Book] 新しい地球学太陽-地球-生命圏相互作用系の変動学,渡邊誠一郎+檜山哲也+安成哲三編 (2008)
  • Author(s): 阿部学,小川忠彦,小川泰信,上出洋介,河合崇欣,菊池崇,関華奈子,川田佳史,松本英二,才野敏郎,中村健治,塩川和夫,野澤悟徳,松見豊,元場哲郎,増田公明,藤木利之,檜山哲也,佐藤淳,安成哲三,渡邊誠一郎,山口靖
  • Publisher: 名古屋大学出版会(ISBN978-4-8158-0590-6)
• [Remarks]
  • URL: http://www.nipr.ac.jp/~yogawa/