2000 Fiscal Year Annual Research Report

国際SuperDARNレーダー網による極域電磁圏擾乱の南北半球比較研究

Research Project

Project/Area Number	11304029
Research Institution	National Institute of Polar Research
Principal Investigator	佐藤夏雄国立極地研究所, 情報科学センター, 教授 (50132709)
Co-Investigator(Kenkyū-buntansha)	小川忠彦名古屋大学, 太陽地球環境研究所, 教授 (60271607) 飯島健九州大学, 大学院・理学研究科, 教授 (70011624) 山岸久雄国立極地研究所, 研究系, 教授 (20132714) 渡辺正和日本学術振興会, 特別研究員福西浩東北大学, 大学院・理学研究科, 教授 (90099937)
Keywords	SuperDARNレーダー / HFレーダー / 極域電磁圏擾乱 / オーロラ / プラズマ対流 / 太陽風 / 地磁気脈動 / 地磁気共役点
Research Abstract	本研究課題は、南北両極域の広範囲を高時間分解能で観測している国際SuperDARNレーダー網の特徴・利点を最大限に生かし、両半球の極域電磁圏で生起している電磁現象のマクロ的・ミクロ的特性を明確にし、太陽風と地球磁気圏との相互作用の物理的プロセスを総合的に解き明かすことを最終目的としている。今年度に得られた具体的な研究成果として、1)昼側の地磁気共役点領域を観測するHFレーダーと光学オーロラの同時観測により、太陽風-磁気圏リコネクションに伴う渦巻き状オーロラ現象を発見した。2)CUTLASSレーダーとEISCATレーダーで同時に得られたカスプ近傍のF層プラズマデータを解析し、ポーラーパッチの生成過程を明らかにした。また、昭和基地レーダーの長期間データを統計解析し、近距離レーダーエコーの特性を明らかにした。3)SuperDARNとGEOTAIL衛星の特別共同観測期間のデータを用い、Pc5帯時期脈動の伝播機構を主に研究した。4)SuperDARNによって観測されるプラズマトラフおよびカスプ領域に出現する電離層F層沿磁力線不規則構造出現の統計的性質を詳細に解析し、日照や太陽風パラメーター等との関係を明らかにした。5)レーダーによるプラズマ対流から、沿磁力線電流の空間・時間構造特性を求めた。磁気圏システムにおける運動量・エネルギー輸送の実体を把握しつつある。6)電離圏カスプの惑星間磁場急峻南転に対するの応答の研究として、惑星間磁場が理想的に北向きから南向きに変化している事象を選び詳細解析を行った。その結果、磁束輸送事象(Flux Transfer Event)の電離圏投影について、その詳細な現象論を明らかにすることができた。

Research Products
(30 results)

All Other

All Publications (30 results)

[Publications] Kikuchi,T. et al: "Global evolution of a substorm-associated DP2 current system observed by SuperDARN and magnetometers"Adv.Space Res.. (in press).
[Publications] Watanabe,M. et al: "The ionospheric response to interplanetary magnetic field variations : Evidence for rapid global change and the role of preconditioning in the magnetosphere"J.Geophys.Res.. 105・22. 955-977 (2000)
[Publications] Yang,H. et al: "Synoptic auroral display along the postnoon auroral oval : A survey with all-sky TV observation at Zhongshan, Antarctica"J.Atmos.Terr.Phys.. 62. 787-797 (2000)
[Publications] Saka,O. et al: "Simultaneous convection transientsin auroral zone and in equator as observed with SuperDARN and equatorial matnetometers : a correlation with Equatorial counter Electrojet (CEJ) event"Adv.Polar Upper Atmos.Res.. 14. 45-54 (2000)
[Publications] Ogawa,T. et al: "Plasma Density Suppression Process Around the Cusp Revealed by Simultaneous, CUTLASS and EISCAT Svalbard Radar Observations"J.Geophys.Res.. in press.
[Publications] Fukumoto,M. et al: "Statistical study of doppler velocity and echo power around 75°magnetic latitude obtaned with the Syowa East HF radr in 1997"Adv.Polar Upper Atmos.Res.. 14. 93-102 (2000)
[Publications] Hosokawa,K. et al: "Characteristics of Solar Flare Effect in the high-latitude ionosphere as oberved by the SuperDARN radars"Adv.Polar Upper Atmos.Res.. 14. 66-75 (2000)
[Publications] Yamagishi,H. et al: "Interhemispheric conjugacy of auroral poleward expansion observed by conjugate imaging riometers at〜67°and 75°-77°invariant latitude"Adv.Polar Upper Atmos.Res.. 14. 12-33 (2000)
[Publications] Nishino,M. et al: "Conjugate features of daytime absorption associated with specific changes in the solar wind observed by inter-hemispheric high latitude imaging riometers"Adv.Polar Upper Atmos.Res.. 14. 76-92 (2000)
[Publications] Milan,S.E. et al: "Investigation of the relationship between optical auroral forms and HF radar E region backscatter"Ann.Geophys.. 18. 608-617 (2000)
[Publications] Murata,Y. et al: "Simultaneous quasi-periodic optical and HF radar signatures observed in the postnoon sector"Adv.Polar Upper Atmos.Res.. 14. 34-44 (2000)
[Publications] Milan,S.T. et al: "A seasonal variation in the convection response to IMF orientation"Geophys.Res., Lett.. 28・3. 471-474 (2001)
[Publications] Sato,N. et al: "Enhancement of optical aurora triggered by the solar wind negative pressure impulse (SI-)"Geophys.Res., Lett.. 28・1. 127-130 (2001)
[Publications] Hosokawa,T. et al: "Spatial Distribution of Irregularity Occurrence Rate in the Subauroral F Region as Observed by the SuperDARN Radars"Proceeding of SuperDARN Workshop 2000.
[Publications] 新海雄一他: "昼側シース領域におけるPc3波動の特性"東海大学紀要工学部. 40・1. 131-135 (2000)
[Publications] 坂田圭司他: "中緯度で観測された太陽活動極大期の磁気嵐"東海大学紀要工学部. 40・2. 109-113 (2000)
[Publications] Tonegawa,Y. et al: "ULF waves simultaneously observed by SuperDARN and GEOTAIL around LLBL"Proceedings from SuperDARN 2000 at La Trobe University. (2000)
[Publications] Aso,T. et al: "a state-of-the-art optical observation network for the exploration of polar atmospheic processes"Adv.Space Res.. 26・6. 917-924 (2000)
[Publications] Tsuda,T. et al: "Coordinated observations of the mesopause region with radar and optical techniques"Adv.Space Res.. 26・6. 907-916 (2000)
[Publications] Ebihara,Y.and M.Ejiri: "Simulation study on fundamental properties of the storm-time ring current"J.Geophys.Res.. 105・A7. 15843-15859 (2000)
[Publications] Leyser,T.B. et al: "Simultaneous measurements of high-frequency pump-enhanced airglow and ionospheric temperature at auroral latitudes"Adv.Polar Upper Atmos.Res.. 14. 1-11 (2000)
[Publications] Watanabe,M.: "Constitution of dayside field-aligned current systems"International J.Geomag.Aeron.. 2(1). 67-75 (2000)
[Publications] Fujii,R. et al: "Energy coupling between the magnetosphere, ionosphere and thermosphere"Adv.Space Res.. 25・1. 213-218 (2000)
[Publications] Kosch,M.J.et al: "A comparison of thermospheric winds and temperatures from Fabry-Perot interferometer and EISCAT radar measurements with models"Adv.Space Res.. 26・6. 979-984 (2000)
[Publications] Ogawa,Y. et al: "Simultaneous EISCAT Svalbard and VHF radar observations of ion upflows at different aspect angles"Geophys.Res.Lett.. 27. 81-84 (2000)
[Publications] Endo,M. et al: "Ion outflow and inflow at the topside ionosphere observed by the EISCAT VHF radar"Ann.Geophys. 18. 170-181 (2000)
[Publications] Yoshida,N. et al: "Coordinated Akebono and EISCAT observations of suprathermal ion outflows in the nightside inverted-V region"J.Atmos.Solar-Terr.Phys. 62. 449-465 (2000)
[Publications] Saito,S. et al: "Effects of kappa distribution electrons on incoherent scatter spectra"Ann.Geophys.. 18. 1216-1223 (2000)
[Publications] Oyama,S. et al: "Effects of atmospheric oscillations on the field-aligned ion motions in the polar F-region"Ann.Geophys.. 18. 1154-1163 (2000)
[Publications] Saito,S. et al: "Observation of isotropic electron temperature in the turbulent E region"Ann.Geophys.. 19. 11-15 (2000)

2000 Fiscal Year Annual Research Report

国際SuperDARNレーダー網による極域電磁圏擾乱の南北半球比較研究

Principal Investigator

佐藤 夏雄 国立極地研究所, 情報科学センター, 教授 (50132709)

Research Products

[Publications] Kikuchi,T. et al: "Global evolution of a substorm-associated DP2 current system observed by SuperDARN and magnetometers"Adv.Space Res.. (in press).

[Publications] Watanabe,M. et al: "The ionospheric response to interplanetary magnetic field variations : Evidence for rapid global change and the role of preconditioning in the magnetosphere"J.Geophys.Res.. 105・22. 955-977 (2000)

[Publications] Yang,H. et al: "Synoptic auroral display along the postnoon auroral oval : A survey with all-sky TV observation at Zhongshan, Antarctica"J.Atmos.Terr.Phys.. 62. 787-797 (2000)

[Publications] Saka,O. et al: "Simultaneous convection transientsin auroral zone and in equator as observed with SuperDARN and equatorial matnetometers : a correlation with Equatorial counter Electrojet (CEJ) event"Adv.Polar Upper Atmos.Res.. 14. 45-54 (2000)

[Publications] Ogawa,T. et al: "Plasma Density Suppression Process Around the Cusp Revealed by Simultaneous, CUTLASS and EISCAT Svalbard Radar Observations"J.Geophys.Res.. in press.

[Publications] Fukumoto,M. et al: "Statistical study of doppler velocity and echo power around 75°magnetic latitude obtaned with the Syowa East HF radr in 1997"Adv.Polar Upper Atmos.Res.. 14. 93-102 (2000)

[Publications] Hosokawa,K. et al: "Characteristics of Solar Flare Effect in the high-latitude ionosphere as oberved by the SuperDARN radars"Adv.Polar Upper Atmos.Res.. 14. 66-75 (2000)

[Publications] Yamagishi,H. et al: "Interhemispheric conjugacy of auroral poleward expansion observed by conjugate imaging riometers at〜67°and 75°-77°invariant latitude"Adv.Polar Upper Atmos.Res.. 14. 12-33 (2000)

[Publications] Nishino,M. et al: "Conjugate features of daytime absorption associated with specific changes in the solar wind observed by inter-hemispheric high latitude imaging riometers"Adv.Polar Upper Atmos.Res.. 14. 76-92 (2000)

[Publications] Milan,S.E. et al: "Investigation of the relationship between optical auroral forms and HF radar E region backscatter"Ann.Geophys.. 18. 608-617 (2000)

[Publications] Murata,Y. et al: "Simultaneous quasi-periodic optical and HF radar signatures observed in the postnoon sector"Adv.Polar Upper Atmos.Res.. 14. 34-44 (2000)

[Publications] Milan,S.T. et al: "A seasonal variation in the convection response to IMF orientation"Geophys.Res., Lett.. 28・3. 471-474 (2001)

[Publications] Sato,N. et al: "Enhancement of optical aurora triggered by the solar wind negative pressure impulse (SI-)"Geophys.Res., Lett.. 28・1. 127-130 (2001)

[Publications] Hosokawa,T. et al: "Spatial Distribution of Irregularity Occurrence Rate in the Subauroral F Region as Observed by the SuperDARN Radars"Proceeding of SuperDARN Workshop 2000.

[Publications] 新海雄一 他: "昼側シース領域におけるPc3波動の特性"東海大学紀要工学部. 40・1. 131-135 (2000)

[Publications] 坂田圭司 他: "中緯度で観測された太陽活動極大期の磁気嵐"東海大学紀要工学部. 40・2. 109-113 (2000)

[Publications] Tonegawa,Y. et al: "ULF waves simultaneously observed by SuperDARN and GEOTAIL around LLBL"Proceedings from SuperDARN 2000 at La Trobe University. (2000)

[Publications] Aso,T. et al: "a state-of-the-art optical observation network for the exploration of polar atmospheic processes"Adv.Space Res.. 26・6. 917-924 (2000)

[Publications] Tsuda,T. et al: "Coordinated observations of the mesopause region with radar and optical techniques"Adv.Space Res.. 26・6. 907-916 (2000)

[Publications] Ebihara,Y.and M.Ejiri: "Simulation study on fundamental properties of the storm-time ring current"J.Geophys.Res.. 105・A7. 15843-15859 (2000)

[Publications] Leyser,T.B. et al: "Simultaneous measurements of high-frequency pump-enhanced airglow and ionospheric temperature at auroral latitudes"Adv.Polar Upper Atmos.Res.. 14. 1-11 (2000)

[Publications] Watanabe,M.: "Constitution of dayside field-aligned current systems"International J.Geomag.Aeron.. 2(1). 67-75 (2000)

[Publications] Fujii,R. et al: "Energy coupling between the magnetosphere, ionosphere and thermosphere"Adv.Space Res.. 25・1. 213-218 (2000)

[Publications] Kosch,M.J.et al: "A comparison of thermospheric winds and temperatures from Fabry-Perot interferometer and EISCAT radar measurements with models"Adv.Space Res.. 26・6. 979-984 (2000)

[Publications] Ogawa,Y. et al: "Simultaneous EISCAT Svalbard and VHF radar observations of ion upflows at different aspect angles"Geophys.Res.Lett.. 27. 81-84 (2000)

[Publications] Endo,M. et al: "Ion outflow and inflow at the topside ionosphere observed by the EISCAT VHF radar"Ann.Geophys. 18. 170-181 (2000)

[Publications] Yoshida,N. et al: "Coordinated Akebono and EISCAT observations of suprathermal ion outflows in the nightside inverted-V region"J.Atmos.Solar-Terr.Phys. 62. 449-465 (2000)

[Publications] Saito,S. et al: "Effects of kappa distribution electrons on incoherent scatter spectra"Ann.Geophys.. 18. 1216-1223 (2000)

[Publications] Oyama,S. et al: "Effects of atmospheric oscillations on the field-aligned ion motions in the polar F-region"Ann.Geophys.. 18. 1154-1163 (2000)

[Publications] Saito,S. et al: "Observation of isotropic electron temperature in the turbulent E region"Ann.Geophys.. 19. 11-15 (2000)

佐藤夏雄国立極地研究所, 情報科学センター, 教授 (50132709)

[Publications] 新海雄一他: "昼側シース領域におけるPc3波動の特性"東海大学紀要工学部. 40・1. 131-135 (2000)

[Publications] 坂田圭司他: "中緯度で観測された太陽活動極大期の磁気嵐"東海大学紀要工学部. 40・2. 109-113 (2000)