Study on the generation mechanism of micro-scale turbulence in Earth's magnetosphere based on high-resolution plasma measurements and innovative analysis methods

• Project/Area Number: 21K03504
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 14010:Fundamental plasma-related
• Research Institution: Japan Aerospace EXploration Agency
• Principal Investigator: 長谷川 洋 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 助教 (50435799)
• Project Period (FY): 2021-04-01 – 2025-03-31
• Project Status: Granted (Fiscal Year 2023)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: プラズマ乱流 / 磁気リコネクション / 人工衛星直接観測 / ケルビン・ヘルムホルツ不安定 / 無衝突プラズマ / 磁場消滅 / 磁気フラックスロープ / 電子電磁流体力学 / 地球磁気圏 / 編隊飛行衛星

Outline of Research at the Start

プラズマ乱流は、無衝突プラズマにおける物質・運動量輸送、粒子加熱・加速の重要な要素である。本研究では、宇宙プラズマ乱流の発生機構の解明を目的として、NASAのMagnetospheric Multiscale（MMS）衛星が取得した高精度かつ高分解能の地球磁気圏プラズマ観測データを、乱流モードを同定できる革新的な解析手法を用いて解析する。特に、プラズマ拡散輸送や加熱への直接的な影響が期待されるが、実態はよくわかっていない、ミクロ乱流の発生・進化過程に焦点をあて、地球磁気圏内外の各領域にどのような乱流が介在し、乱流が物質・エネルギー輸送に寄与しているかどうか、観測的に理解することを目指す。

Outline of Annual Research Achievements

プラズマ乱流は太陽風や実験室プラズマなどプラズマ宇宙に普遍的に存在する現象であり、プラズマの輸送や混合などに関わる重要な素過程であるが、その励起・発達機構はよくわかっていない。その理由の一つはプラズマ乱流が成長する現場の直接観測が容易でないことである。本研究では、太陽風と地球磁気圏の相互作用によってプラズマ乱流が励起される現場である磁気圏境界領域等における人工衛星直接詳細観測データを最先端のデータ解析手法を用いて分析し、乱流の励起過程に関する知見を得ることを目的としている。
2023年度は、Magnetospheric Multiscale（MMS）衛星によって太陽風磁場が南向きという条件下で観測された磁気圏境界でのケルビン・ヘルムホルツ不安定（KHI）イベントを解析した。太陽風磁場が北向きの場合には、KHIに伴って磁気リコネクションが誘発され、プラズマ輸送に寄与しうることが理論的にも観測的にも検証されていた。しかし、太陽風磁場が南向きの時に磁気リコネクションがKHIの成長に伴って誘発されるかどうかについては、数値シミュレーションによる予測はあったものの、観測的証拠はなかった。2023年度は、KHIによって成長した渦乱流中の電流層の三次元磁場構造をMMS衛星の磁場・プラズマ観測データを用いて再現し、渦中の密度勾配層で磁気リコネクションが起こっていることを世界で初めて発見した。KHI渦中の密度勾配層で、低域混成ドリフト不安定と呼ばれる運動論的プラズマ不安定の成長に伴って磁気リコネクションが誘発される、という三次元数値シミュレーションの予測と整合する観測である。これは、太陽風磁場が南向きの場合の磁気圏境界層における無衝突プラズマ混合過程を同定したという点で意義のある成果である。

Current Status of Research Progress

3: Progress in research has been slightly delayed.

Reason

プラズマ乱流中で磁気エネルギーがいかに散逸されるかという問題は無衝突プラズマ乱流における最重要課題の一つであるが、2022年に報告した「磁気リコネクションが起こっている電流層での磁場消滅」の発見（Hasegawa et al. 2022）は、乱流磁場の散逸機構の一つになりうるという点で、問題解決のための転換点になりうる画期的な成果であると考える。
研究協力者の一人として海外で数値シミュレーション研究を行っていた中村琢磨氏が2022年度中に研究業界を去ったため、理論・数値実験の側面からのサポートが激減し、研究の進捗がやや遅れている。
また現在、MMS衛星ミッションの科学成果をまとめたレヴュー論文集が準備されており、研究代表者は磁気リコネクションの直接観測データを解析するための一連の手法の概要を整理してまとめたレヴュー論文の筆頭著者として、国際研究者チームをリードし、論文の執筆・投稿・改訂を行った。2022年度から2023年度にかけて、この作業に多くの時間が割かれたことも、データ解析の進捗が遅れている理由の一つである。しかし、このレヴュー論文でまとめたデータ解析手法群のいくつかは、乱流を含む様々な宇宙プラズマ現象の解析にも利用できるものであり、この論文出版も本研究課題の成果の一つとなる予定である。

Strategy for Future Research Activity

2024年度はMagnetospheric Multiscale（MMS）衛星によって地球磁気圏境界領域で同定されたケルビン・ヘルムホルツ不安定に伴う表面波・プラズマ渦乱流の観測事例の中から、特殊な例として、コロナ質量放出（CME）の発生下で太陽風の密度が著しく低下し、太陽風のアルヴェンマッハ数が１を下回った（亜アルヴェン速度太陽風）時の観測事例のデータ解析を進める。
また、プラズマ乱流を解析するための新しい手法の開発に着手する。特に、プラズマ乱流中で発生することがある磁気リコネクションは、しばしば強い温度異方性（磁力線に平行方向と垂直方向の温度が異なる状況）を伴って観測されることがあるので、温度異方性を考慮した上で磁気リコネクション領域の二次元構造（磁場や電子の速度場）をその場観測データから再現するための解析手法を開発する。理論的なアイデアはほぼ完成しているので、今後はデータ解析プログラムを改良し、数値コードを試験していく予定である。

Research Products

• [Int'l Joint Research] Dartmouth College/Southwest Research Institute/University of New Hampshire(米国)
• [Int'l Joint Research] Austrian Academy of Science/University of Graz(オーストリア)
• [Int'l Joint Research] Shandong University(中国)
• [Int'l Joint Research] Swedish Institute of Space Physics(スウェーデン)
• [Int'l Joint Research] Sorbonne University/University of Paul Sabatier/University of Bordeaux(フランス)
• [Int'l Joint Research]
• [Int'l Joint Research] Dartmouth College/Southwest Research Institute/NASA Goddard Space Flight Center(米国)
• [Int'l Joint Research] Austrian Academy of Science/University of Graz(オーストリア)
• [Int'l Joint Research] Shandong University/Chinese Academy of Science(中国)
• [Int'l Joint Research] Royal Institute of Technology/Swedish Institute of Space Physics(スウェーデン)
• [Int'l Joint Research] Universiti Kebangsaan Malaysia(マレーシア)
• [Int'l Joint Research] Austrian Academy of Science/University of Graz(オーストリア)
• [Int'l Joint Research] Dartmouth College/Southwest Research Institute/University of California, Berkeley(米国)
• [Int'l Joint Research] University of Bergen(ノルウェー)
• [Int'l Joint Research] MPI for Extraterrestrial Physics/Technische Universitaet Braunschweig(ドイツ)
• [Int'l Joint Research] Rutherford-Appleton Laboratory/Imperial College London(英国)
• [Int'l Joint Research]
• [Journal Article] Determining the Orientation of a Magnetic Reconnection X Line and Implications for a 2D Coordinate System (2024)
  • Author(s): Denton Richard E.、Liu Yi‐Hsin、Agudelo Rueda Jefferson A.、Genestreti Kevin J.、Hasegawa Hiroshi、Hosner Martin、Torbert Roy B.、Burch James L.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 129 Issue: 1
  • DOI: 10.1029/2023ja032167
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Characterization of Magnetic Flux Contents for Two Flux Transfer Events From Both In Situ and Ionospheric Observations (2024)
  • Author(s): Wang Shuo、Zou Ying、Hu Qiang、Shi Xueling、Hasegawa Hiroshi
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 129 Issue: 2
  • DOI: 10.1029/2023ja032088
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Electron‐Scale Reconnecting Current Sheet Formed Within the Lower‐Hybrid Wave‐Active Region of Kelvin‐Helmholtz Waves (2023)
  • Author(s): Blasl K. A.、Nakamura T. K. M.、Nakamura R.、Settino A.、Hasegawa H.、Voros Z.、Hosner M.、Schmid D.、Volwerk M.、Roberts Owen W.、Panov E.、Liu Yi‐Hsin、Plaschke F.、Stawarz J. E.、Holmes J. C.
  • Journal Title: Geophysical Research Letters Volume: 50 Issue: 19
  • DOI: 10.1029/2023gl104309
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Kelvin-Helmholtz instability-driven magnetopause dynamics as turbulent pathway for the solar wind-magnetosphere coupling and the flank-central plasma sheet communication (2023)
  • Author(s): Hwang Kyoung-Joo、Wang Chih-Ping、Nykyri Katariina、Hasegawa Hiroshi、Tapley Mark B.、Burch James L.、Fuselier Stephen A.、Goldstein Jerry、Dokgo Kyunghwan、Nakamura Takuma、Sitnov Mikhail、Ma Xuanye、Lin Yu、Wang Xue
  • Journal Title: Frontiers in Astronomy and Space Sciences Volume: 10
  • DOI: 10.3389/fspas.2023.1151869
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cross-Scale Processes of Magnetic Reconnection (2023)
  • Author(s): Hwang K.-J.、Nakamura R.、Eastwood J. P.、Fuselier S. A.、Hasegawa H.、Nakamura T.、Lavraud B.、Dokgo K.、Turner D. L.、Ergun R. E.、Reiff P. H.
  • Journal Title: Space Science Reviews Volume: 219 Issue: 8
  • DOI: 10.1007/s11214-023-01010-9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spatial and time scaling of coalescing multiple magnetic islands (2023)
  • Author(s): Nakamura T. K. M.、Teh W.-L.、Zenitani S.、Umeda T.、Oka M.、Hasegawa H.、Veronig A. M.、Nakamura R.
  • Journal Title: Physics of Plasmas Volume: 30 Issue: 2 Pages: 022902-022902
  • DOI: 10.1063/5.0127107
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ion‐Scale Magnetic Flux Rope Generated From Electron‐Scale Magnetopause Current Sheet: Magnetospheric Multiscale Observations (2023)
  • Author(s): Hasegawa H.、Denton R. E.、Dokgo K.、Hwang K.‐J.、Nakamura T. K. M.、Burch J. L.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 128 Issue: 3
  • DOI: 10.1029/2022ja031092
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Magnetic Field Annihilation in a Magnetotail Electron Diffusion Region With Electron‐Scale Magnetic Island (2022)
  • Author(s): Hasegawa H.、Denton R. E.、Nakamura T. K. M.、Genestreti K. J.、Phan T. D.、Nakamura R.、Hwang K.‐J.、Ahmadi N.、Shi Q. Q.、Hesse M.、Burch J. L.、Webster J. M.、Torbert R. B.、Giles B. L.、Gershman D. J.、Russell C. T.、Strangeway R. J.、Wei H. Y.、Lindqvist P.‐A.、Khotyaintsev Y. V.、Ergun R. E.、Saito Y.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 127 Issue: 7
  • DOI: 10.1029/2022ja030408
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Polynomial Reconstruction of the Magnetic Field Observed by Multiple Spacecraft With Integrated Velocity Determination (2022)
  • Author(s): Denton Richard E.、Liu Yi‐Hsin、Hasegawa Hiroshi、Torbert Roy B.、Li Wenya、Fuselier Stephen、Burch James L.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 127 Issue: 10
  • DOI: 10.1029/2022ja030512
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Multi-scale observations of the magnetopause Kelvin?Helmholtz waves during southward IMF (2022)
  • Author(s): Blasl K. A.、Nakamura T. K. M.、Plaschke F.、Nakamura R.、Hasegawa H.、Stawarz J. E.、Liu Yi-Hsin、Peery S.、Holmes J. C.、Hosner M.、Schmid D.、Roberts O. W.、Volwerk M.
  • Journal Title: Physics of Plasmas Volume: 29 Issue: 1
  • DOI: 10.1063/5.0067370
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multi-scale evolution of Kelvin?Helmholtz waves at the Earth's magnetopause during southward IMF periods (2022)
  • Author(s): Nakamura T. K. M.、Blasl K. A.、Hasegawa H.、Umeda T.、Liu Y.-H.、Peery S. A.、Plaschke F.、Nakamura R.、Holmes J. C.、Stawarz J. E.、Nystrom W. D.
  • Journal Title: Physics of Plasmas Volume: 29 Issue: 1 Pages: 012901-012901
  • DOI: 10.1063/5.0067391
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Transport Path of Cold‐Dense Plasmas in the Dusk Magnetotail Plasma Sheet: MMS Observations (2022)
  • Author(s): Nishino M. N.、Hasegawa H.、Saito Y.、Kitamura N.、Miyashita Y.、Nagai T.、Yokota S.、Russell C. T.、Gershman D. J.、Giles B. L.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 127 Issue: 1
  • DOI: 10.1029/2021ja029747
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spatial Scales of the Velocity Shear Layer and Kelvin‐Helmholtz Waves on the Magnetopause: First Statistical Results (2022)
  • Author(s): Zhou Yue、Shue Jih‐Hong、Hasegawa Hiroshi、Lu Jianyong、Wang Ming、Zhang Hanxiao
  • Journal Title: Geophysical Research Letters Volume: 49 Issue: 4
  • DOI: 10.1029/2021gl097271
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Reconstruction of the Electron Diffusion Region With Inertia and Compressibility Effects (2021)
  • Author(s): Hasegawa H.、Nakamura T. K. M.、Denton R. E.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 11
  • DOI: 10.1029/2021ja029841
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fast Cross‐Scale Energy Transfer During Turbulent Magnetic Reconnection (2021)
  • Author(s): Nakamura T. K. M.、Hasegawa H.、Genestreti K. J.、Denton R. E.、Phan T. D.、Stawarz J. E.、Nakamura R.、Nystrom W. D.
  • Journal Title: Geophysical Research Letters Volume: 48 Issue: 13
  • DOI: 10.1029/2021gl093524
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Flank magnetopause as turbulent pathway for the solar wind-magnetosphere coupling and to/from the magnetotail (2023)
  • Author(s): Hwang, K.-J., Dokgo, K., Wang, C.-P., Nykyri, K., Burch, J. L., Tapley, M., Goldstein, J., Hasegawa, H., Nakamura, T. K. M., Sitnov, M., Ma, X., Lin, Y., and Wang, X.-Y.
  • Organizer: 5th COSPAR Symposium, Space Science with Small Satellites
  • Int'l Joint Research
• [Presentation] Reconnection signatures within the Kelvin-Helmholtz vortex-induced lower-hybrid waves at Earth’s magnetopause (2023)
  • Author(s): Blasl, K. A., Nakamura, T. K. M., Nakamura, R., Settino, A., Voros, Z., Hosner, M., Schmid, D., Volwerk, M., Roberts, O. W., Panov, E., Liu, Y.-H., Plaschke, F., Hasegawa, H., Stawarz, J. E., and Holmes, J. C.
  • Organizer: EGU General Assembly 2023
  • Int'l Joint Research
• [Presentation] Ion-scale magnetic flux rope generated from electron-scale magnetopause current sheet: Magnetospheric Multiscale observations (2023)
  • Author(s): Hasegawa, H., Denton, R. E., Dokgo, K., Hwang, K.-J., Nakamura, T. K. M., and Burch, J. L.
  • Organizer: JpGU 2023
  • Int'l Joint Research
• [Presentation] Transient processes in magnetic reconnection in the Earth’s magnetosphere: Magnetic field annihilation and flux rope formation (2023)
  • Author(s): Hasegawa, H., Denton, R. E., Nakamura, T. K. M., Hwang, K.-J., and Burch, J. L.
  • Organizer: MR2023 Workshop on Magnetic Reconnection
  • Int'l Joint Research / Invited
• [Presentation] Reconnection signatures within the Kelvin-Helmholtz vortex-induced Lower- Hybrid waves at Earth’s magnetopause (2023)
  • Author(s): K. A. Blasl, T. K. M. Nakamura, R. Nakamura, A. Settino, Z. Voros, M. Hosner, D. Schmid, M. Volwerk, O. W. Roberts, E. Panov, Yi-Hsin Liu, F. Plaschke, H. Hasegawa, J. E. Stawarz, J. C. Holmes
  • Organizer: MR2023 Workshop on Magnetic Reconnection
  • Int'l Joint Research
• [Presentation] Polynomial reconstruction of magnetic reconnection events observed by the MMS spacecraft (2023)
  • Author(s): Denton, R. E., Hasegawa, H., Liu, Y.-H., and Torbert, R. B.
  • Organizer: IUGG 28th General Assembly
  • Int'l Joint Research
• [Presentation] Magnetospheric Multiscale observations of ion-scale magnetic flux rope generated from electron-scale magnetopause current sheet (2023)
  • Author(s): Hasegawa, H., Denton, R. E., Dokgo, K., Hwang, K.-J., Nakamura, T. K. M., and Burch, J. L.
  • Organizer: AOGS 2023
  • Int'l Joint Research
• [Presentation] Identification and analysis of in-situ observations of magnetic reconnection in the magnetosphere (2023)
  • Author(s): Hasegawa, H., and the ISSI team
  • Organizer: 7th Asia-Pacific Conference on Plasma Physics
  • Int'l Joint Research / Invited
• [Presentation] On the prevalence and significance of electron-scale magnetic reconnection in the context of the Kelvin-Helmholtz instability (2023)
  • Author(s): Blasl, K. A., T. K. M. Nakamura, R. Nakamura, A. Settino, H. Hasegawa, Z. Voros, M. Hosner, E. Panov, D. Schmid, M. Volwerk, O. W. Roberts, and Yi-Hsin Liu
  • Organizer: AGU Fall Meeting 2023
  • Int'l Joint Research
• [Presentation] Determining the orientation of a magnetic reconnection X line and implications for a 2D coordinate system (2023)
  • Author(s): Denton, R. E., Liu, Y.-H., Aguelo Rueda, J. A., Genestreti, K., and Hasegawa, H.
  • Organizer: AGU Fall Meeting 2023
  • Int'l Joint Research
• [Presentation] Reconstruction of the electron diffusion region of guide-field magnetic reconnection (2023)
  • Author(s): Hasegawa, H., Egedal, J., and Denton, R. E.
  • Organizer: AGU Fall Meeting 2023
  • Int'l Joint Research
• [Presentation] Kelvin-Helmholtz instability as turbulent pathway for the solar wind-magnetosphere coupling and the flank-central plasma sheet communication (2023)
  • Author(s): Hwang, K.-J., Wang, C.-P., Nykyri, K., Hasegawa, H., et al.
  • Organizer: AGU Fall Meeting 2023
  • Int'l Joint Research
• [Presentation] Evidence for ion-scale magnetic flux ropes generated in electron-scale magnetopause current sheet (2022)
  • Author(s): Hasegawa, H., Denton, R. E., Hwang, K.-J., Dokgo, K., Nakamura, T. K. M., and Burch, J. L.
  • Organizer: MMS Community Science Workshop #8
  • Int'l Joint Research
• [Presentation] Test of polynomial reconstructions using particle-in-cell simulation data (2022)
  • Author(s): Denton, R. E., Liu, Y.-H., Hasegawa, H., Torbert, R. B., Egedal, J., and Schroeder, J. M.
  • Organizer: MMS Community Science Workshop #8
  • Int'l Joint Research
• [Presentation] Recent developments in reconstruction of the magnetic field observed by spacecraft (2022)
  • Author(s): Denton, R. E., Liu, Y.-H., Hasegawa, H., and Torbert, R.
  • Organizer: US-Japan Workshop on Magnetic Reconnection 2022
  • Int'l Joint Research
• [Presentation] Multi-scale observations of the magnetopause Kelvin-Helmholtz waves during southward IMF (2022)
  • Author(s): Blasl, K. A., Nakamura, T. K. M., Plaschke, F., Nakamura, R., Hasegawa, H., Stawarz, J. E., Liu, Y.-H., Peery, S., Holmes, J. C., Hosner, M., Schmid, D., Roberts, O. W., and Volwerk, M.
  • Organizer: EGU General Assembly 2022
  • Int'l Joint Research
• [Presentation] Reconstruction of the diffusion region of magnetic reconnection with electron inertia and compressibility effects (2022)
  • Author(s): Hasegawa, H., Nakamura, T. K. M., and Denton, R. E.
  • Organizer: JpGU Meeting 2022
  • Int'l Joint Research
• [Presentation] Reconnection signatures within the Kelvin-Helmholtz vortex-induced lower-hybrid waves at Earth’s magnetopause (2022)
  • Author(s): Blasl, K. A., Nakamura, T. K. M., Nakamura, R., Hasegawa, H., Liu, Y.-H., Holmes, J. C., Hosner, M., Schmid, D., Roberts, O. W., Volwerk, M., Voros, Z., and Panov, E.
  • Organizer: COSPAR 2022 - 44th Scientific Assembly
  • Int'l Joint Research
• [Presentation] Origin of positive and negative energy conversion rate j*E' in an electron-scale reconnecting current sheet at the magnetopause (2022)
  • Author(s): Hasegawa, H., R. E. Denton, K. Dokgo, K.-J. Hwang, T. K. M. Nakamura, and J. L. Burch
  • Organizer: MMS Fall 2022 SWT Meeting
  • Int'l Joint Research
• [Presentation] Multi-spacecraft observations of the Kelvin-Helmholtz instability at the magnetopause under northward interplanetary magnetic field: from discovery to recent advances (2022)
  • Author(s): Hasegawa, H., S. Eriksson, and T. K. M. Nakamura
  • Organizer: Cluster 22th Anniversary Symposium
  • Int'l Joint Research / Invited
• [Presentation] Hasegawa, H., R. E. Denton, K.-J. Hwang, K. Dokgo, T. K. M. Nakamura, and J. L. Burch, Generation of ion-scale magnetic flux ropes from electron-scale magnetopause current sheet (2022)
  • Author(s): Hasegawa, H., R. E. Denton, K.-J. Hwang, K. Dokgo, T. K. M. Nakamura, and J. L. Burch
  • Organizer: AGU Fall Meeting 2022
  • Int'l Joint Research
• [Presentation] Reconnection signatures within the Kelvin-Helmholtz vortex-induced lower-hybrid waves at Earth’s magnetopause (2022)
  • Author(s): Blasl, K. A., T. K. M. Nakamura, R. Nakamura, Z. Voros, M. Hosner, D. Schmid, A. Settino, M. Volwerk, O. W. Roberts, E. V. Panov, Y.-H. Liu, F. Plaschke, H. Hasegawa, J. E. Stawarz, and J. C. Holmes
  • Organizer: AGU Fall Meeting 2022
  • Int'l Joint Research
• [Presentation] Multi-scale and cross-process character of the Kelvin-Helmholtz instability during southward interplanetary magnetic field conditions (2022)
  • Author(s): Blasl, K. A., T. K. M. Nakamura, R. Nakamura, F. Plaschke, Z. Voros, H. Hasegawa, M. Hosner, D. Schmid, A. Settino, M. Volwerk, O. W. Roberts, E. V. Panov, Y.-H. Liu, S. Peery, J. E. Stawarz, and J. C. Holmes
  • Organizer: AGU Fall Meeting 2022
  • Int'l Joint Research / Invited
• [Presentation] Micro-scale tearing mode turbulence in the diffusion region during macro-scale evolution of turbulent reconnection (2021)
  • Author(s): Nakamura, T. K. M., H. Hasegawa, K. J. Genestreti, T. D. Phan, R. E. Denton, and R. Nakamura
  • Organizer: EGU General Assembly 2021
  • Int'l Joint Research
• [Presentation] Fast magnetic-field annihilation in electron-scale current sheet in Earth’s magnetotail (2021)
  • Author(s): Hasegawa, H., R. E. Denton, K. J. Genestreti, T. K. M. Nakamura, T. D. Phan, R. Nakamura, K.-J. Hwang, N. Ahmadi, Q. Q. Shi, M. Hesse, J. L. Burch, J. M. Webster, R. B. Torbert, B. L. Giles, D. J. Gershman, C. T. Russell, H. Y. Wei, P.-A. Lindqvist, Y. V. Khotyaintsev, R. E. Ergun, and Y. Saito
  • Organizer: JpGU Meeting 2021
  • Int'l Joint Research
• [Presentation] On the origin of cold-dense plasmas in the dusk magnetotail plasma sheet: MMS and Geotail observations (2021)
  • Author(s): Nishino, M. N., Y. Saito, H. Hasegawa, N. Kitamura, Y. Miyashita, T. Nagai, S. Yokota, D. Gershman, C. T. Russell, and B. L. Giles
  • Organizer: JpGU Meeting 2021
  • Int'l Joint Research
• [Presentation] Fast magnetic field annihilation in electron-scale current sheet in Earth’s magnetotail (2021)
  • Author(s): Hasegawa, H., R. E. Denton, T. K. M. Nakamura, K. J. Genestreti, and T. D. Phan
  • Organizer: AOGS 2021 Virtual Meeting
  • Int'l Joint Research / Invited
• [Presentation] Fast magnetic field annihilation in magnetotail electron-scale current sheet (2021)
  • Author(s): Hasegawa, H., R. E. Denton, T. K. M. Nakamura, K. J. Genestreti, and T. D. Phan
  • Organizer: IAGA-IASPEI 2021 Virtual Conference
  • Int'l Joint Research / Invited
• [Presentation] Reconstruction of the electron diffusion region with inertia and compressibility effects (2021)
  • Author(s): Hasegawa, H., Nakamura, T. K. M., and Denton, R. E.
  • Organizer: MMS Community Science Workshop #7
  • Int'l Joint Research
• [Presentation] Multi-scale observations of the magnetopause Kelvin-Helmholtz waves during southward IMF (2021)
  • Author(s): Blasl, K. A., Nakamura, T. K. M., Plaschke, F., Nakamura, R., Hasegawa, H., Stawarz, J. E., Liu, Y.-H., Peery, S., Hosner, M., Schmid, D., Holmes, J., Roberts, O. W., and Volwerk, M.
  • Organizer: AGU Fall Meeting 2021
  • Int'l Joint Research
• [Presentation] Vortex-induced reconnection at the Earth’s magnetopause (2021)
  • Author(s): Nakamura, T. K. M., Hasegawa, H., Stawarz, J. E., Eriksson, S., Li, W. Y., and Blasl, K. A.
  • Organizer: AGU Fall Meeting 2021
  • Int'l Joint Research / Invited
• [Presentation] Reconstruction of the electron diffusion region with inertia and compressibility effects (2021)
  • Author(s): Hasegawa, H., Nakamura, T. K. M., and Denton, R. E.
  • Organizer: AGU Fall Meeting 2021
  • Int'l Joint Research