磁気圏サブスト-ムの研究:現状と展望

1991 年度 実績報告書

• 研究課題/領域番号: 02302027
• 研究機関: 東京大学
• 研究代表者: 飯島 健 東京大学, 理学部, 助教授 (70011624)
• 研究分担者: 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)
• キーワード: 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

研究概要

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。

研究成果

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