磁気圏サブスト-ムの研究:現状と展望

1991 Fiscal Year Annual Research Report

• Project/Area Number: 02302027
• Research Institution: The University of Tokyo
• Principal Investigator: 飯島 健 東京大学, 理学部, 助教授 (70011624)
• Co-Investigator(Kenkyū-buntansha): 西田 篤弘 宇宙科学研究所, 教授 (40013643) ; 大家 寛 東北大学, 理学部, 教授 (80025931) ; 國分 征 東京大学, 理学部, 教授 (00011502) ; 向井 利典 宇宙科学研究所, 助教授 (60013695) ; 小口 高 名古屋大学, 太陽地球環境研究所, 教授 (40011457)
• Keywords: 磁気圏サブスト-ム / キクパンジョン相 / グロ-ス相 / プラズマシ-ト / 電離圏磁気圏カップリング / オ-ロラ嵐 / 磁気圏電流系 / 磁気圏プラズマ

Research Abstract

平成2年9月3日ー7日、箱根で国際研究集会を主催し、磁気圏サブスト-ムの研究:現状土展望を討議した。会議を通じて得られた学術上の成果は米国地球物理学連合出版図書“MAGNETOSPHERIC SUBSTORMS" (総頁数476)に収録されている。7項目にわたり、観測、シミュレ-ション理論の立場から一貫して論じられている。電離圏とプラズマシ-トでのサブスト-ムの理解が主であった従来に対し、将来は磁気圏全体に着目したグロ-バルな理解が必須との認識に到った。長年の懸案事項で、本会議により新しい観点から解決の糸口を得られた例は、(1)磁気X線形成はサブスト-ムエクパンジョンの原因か結果か、(2)クロスティル電流の崩壊はキクパンジョンの原因か結果か、(3)磁形気圏プラズマ対流の強度に対する電離圏応答はキクパンジョンの引き金か結果か等々である。これら諸問題を解決する鍵は、キクパンジョンの開始を何が決めるか、クロスティル電流の崩壊は何をもって決定されるか、X型線成は何で決定されるか、現象論的にそれぞれについてタイミングと空間位置をどの程度的確におさえられるかにあることが総括された。磁気圏サブスト-ムの研究は、電離圏と磁気圏プラズマシ-トを包括してグロ-バルに考察していくこと、観測ー計算機シミュレションー理論を一環とした研究体制で臨むことが出来るかどうかが今後の発展を決定するということであった。本研究課題の実施を通じて得られた磁気圏研究の動向に関する国際的認識は、現在既に進められている国際共同研究計画(ISTP、GEM、STEP)に活用され、この方面の研究の急速な進展に寄与し得るものと確信している。

Research Products

• [Publications] Akasofu,S.I.: "Development of magnetospheric physics." "Magnetospheric Substorms" Geophysical Monograph. 64. 3-10 (1991)
• [Publications] Stern,D.P.: "The beginning of substorm research." "Magnetospheric Substorms" Geophysical Monograph. 64. 11-16 (1991)
• [Publications] Pudovkin,M.I.: "Physics of magnetospheric substorm:A review." “Magnetospheric Substorms" Geophysical Monograph. 64. 17-28 (1991)
• [Publications] Feldstein,Y.I.: "Substorm current systems and auroral dynamics." “Magnetospheric Substorms" Geophysical Monograph. 64. 29-42 (1991)
• [Publications] Lui,A.T.Y.: "A synthesis model for magnetospheric substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 43-60 (1991)
• [Publications] Rostoker,G.: "Observational constraints for substorms models." “Magnetospheric Substorms" Geophysical Monograph. 64. 61-72 (1991)
• [Publications] Kan,J.R.: "Synthesizing a global model of substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 73-90 (1991)
• [Publications] Nagai,T.: "An empirical model of substormーrelated magnetic field variations at synchronous orbit." “Magnetospheric Substorms" Geophysical Monograph. 64. 91-96 (1991)
• [Publications] Iijima,T.: "The relationship between ion and electron precipitation patterns and fieldーaligned current systems during a substorm." “Magnetospheric Substorms" Geophysical Monograph. 64. 97-110 (1991)
• [Publications] Zanetti,L.J.: "Birkelandーionosphere currents of the magnetospheric storm circuit." “Magnetospheric Substorms" Geophysical Monograph. 64. 111-122 (1991)
• [Publications] Lopez,R.E.: "Simultaneous observations of the westward electrojet and the crosstail current sheet during substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 123-130 (1991)
• [Publications] Ohtani,S.: "Tail current disruption in the geosynchronous region." “Magnetospheric Substorms" Geophysical Monograph. 64. 131-140 (1991)
• [Publications] Baumjohann,W.: "Heating and fast flows in the nearーearth tail." “Magnetospheric Substorms" Geophysical Monograph. 64. 141-146 (1991)
• [Publications] Baker,D.N.: "The earthward edge of the plasma sheet in magnetospheric substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 147-160 (1991)
• [Publications] Lyons,L.R.: "Association between tail substorm phenomena and magnetic separatrix distortion." “Magnetospheric Substorms" Geophysical Monograph. 64. 161-170 (1991)
• [Publications] Scholer,M.: "Three dimensional numerical simulations of magnetotail reconnection." “Magnetospheric Substorms" Geophysical Monograph. 64. 171-176 (1991)
• [Publications] Birn,J.: "Substorm features in MHD simultations of magnetotail dynamics." “Magnetospheric Substorms" Geophysical Monograph. 64. 177-190 (1991)
• [Publications] Atkinson,G.: "A magnetosphere wags the tail model of substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 191-200 (1991)
• [Publications] Roux,A.: "Role of the near earth plasma sheet at substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 201-214 (1991)
• [Publications] Owen,C.J.: "Properties of the geotail plasma sheetーtheory and observations." “Magnetospheric Substorms" Geophysical Monograph. 64. 215-224 (1991)
• [Publications] Delcourt,D.C.: "Tracing and acceleration of midーtail ions during substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 225-234 (1991)
• [Publications] Kaneda,E.: "Auroral substorm observed by UVーimager on Akebono." “Magnetospheric Substorms" Geophysical Monograph. 64. 235-240 (1991)
• [Publications] Murphree,J.S.: "Viking optical substorm signatures." “Magnetospheric Substorms" Geophysical Monograph. 64. 241-256 (1991)
• [Publications] Elphinstone,R.D.: "Observations of charges to the auroral distribution prior to substorm onset." “Magnetospheric Substorms" Geophysical Monograph. 64. 257-276 (1991)
• [Publications] Mukai,T.: "EXOSーD observations of charged particle precipitation and acceleration process." “Magnetospheric Substorms" Geophysical Monograph. 64. 277-284 (1991)
• [Publications] Nakamura,R.: "Auroral and energetic particle signatures during a substorm with multiple expansion." “Magnetospheric Substorms" Geophysical Monograph. 64. 285-294 (1991)
• [Publications] Heikkila,W.: "Auroral substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 295-304 (1991)
• [Publications] Marklund,G.: "Toward a better understanding of the global auroral electrodynamics through numerical modeling studies." “Magnetospheric Substorms" Geophysical Monograph. 64. 305-322 (1991)
• [Publications] Daglis,I.A.: "Statistical features of the substorm expansion phase ad observed by the AMPTE/CCE spacecraft." “Magnetospheric Substorms" Geophysical Monograph. 64. 323-332 (1991)
• [Publications] Pulkkinen,I.A.: "Auroral signatures of substorm recovery phase:A Case study." “Magnetospheric Substorms" Geophysical Monograph. 64. 333-342 (1991)
• [Publications] Korth,A.: "A statistical study of substorm onset conditions at geostationary orbit." “Magnetospheric Substorms" Geophysical Monograph. 64. 343-354 (1991)
• [Publications] Lundin,R.: "The contribution of the boundary layer EMF to magnetospheric substorms." “Magnetospheric Substorms" Geophysical Monograph. 64. 355-374 (1991)
• [Publications] Moses,J.J.: "Polar cap convection:steady state and dynamic effects." “Magnetospheric Substorms" Geophysical Monograph. 64. 375-386 (1991)
• [Publications] Ondoh,T.: "Polar hiss." “Magnetospheric Substorms" Geophysical Monograph. 64. 387-398 (1991)
• [Publications] Lassen,K.: "Driven and unloading electrojets during the main phase of a magnetic storm." “Magnetospheric Substorms" Geophysical Monograph. 64. 399-408 (1991)
• [Publications] Kawano,H.: "Occurrence of magnetic flux transfer events during substorm." “Magnetospheric Substorms" Geophysical Monograph. 64. 409-420 (1991)
• [Publications] Stern,D.: "Substorm electrodynamics." “Magnetospheric Substorms" Geophysical Monograph. 64. 421-424 (1991)
• [Publications] Winglee,R.M.: "Characteristics of the field and particle acceleration during rapidly induced tail thinning." “Magnetospheric Substorms" Geophysical Monograph. 64. 425-436 (1991)
• [Publications] Dusenbery,P.B.: "The development of fieldーaligned currents and auroral particle acceleration during active times." “Magnetospheric Substorms" Geophysical Monograph. 64. 437-448 (1991)
• [Publications] Klimas,A.J.: "A nonlinear dynamic analogue model of geomagnetic activity." “Magnetospheric Substorms" Geophysical Monograph. 64. 449-460 (1991)
• [Publications] Voros,Z.: "Synergetic approach to substorm phenomena." “Magnetospheric Substorms" Geophysical Monograph. 64. 461-468 (1991)
• [Publications] Li,X.: "Ring current ion with micropulsations during the recovery phase of geomagnetic storms." “Magnetospheric Substorms" Geophysical Monograph. 64. 469-476 (1991)