1997 Fiscal Year Annual Research Report

SuperDARNレーダーを用いた極域電磁圏ダイナミクスの研究

Research Project

Project/Area Number	08454138
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)	行松章国立極地研究所, 研究系, 助手 (70260007) 麻生武彦国立極地研究所, 北極圏環境研究センター, 教授 (10026255) 江尻全機国立極地研究所, 資料系, 教授(資料主幹) (30013692) 小川忠彦名古屋大学, 太陽地球環境研究所, 教授 (60271607)
Keywords	HFレーダー / オーロラ / レーダー / 衛星 / 磁気圏 / プラズマ現象 / 南極 / 電離圏
Research Abstract	南極昭和基地のHFレーダーは国際HFレーダー網観測(SuperDARN)の一環として活動している。本研究目的は、昭和基地を含めたSuperDARNレーダーを用いて、電離圏や磁気圏で生起するプラズマダイナミックスの形態を明らかにする事を目的にしている。本年度の測定面での特記事項は、SuperDARNを中心と位置づけての、EISCATレーダー、GeotailやAkebono衛星との同時観測を企画し、磁気圏境界面付近プラズマの時間的・空間的変動について貴重な観測情報を得る事ができた。 SuperDARN観測データを用いての研究成果概要は以下のとうりである。 1.オーロラサブストームに伴い、夜側磁気圏が急激に地球方向に早い速度で移動する事実をつきとめた。 2.昼間側の磁気圏では、太陽風と地球磁気圏との相互作用による早いプラズマ対流が存在する事を、新たに開発した高時間分解能観測で明らかにした。 3.衛星で観測したグローバルなオーロラ形態とHFレーダーとの同時観測から、可視オーロラの発達過程と電磁気圏電場の変動との相関関係を明らかにできた。 4.極域でのプラズマ対流が赤道付近のジェット電流と良い相関がある事が分かり、極域の磁気圏電場が瞬時に赤道域まで達している事を明らかにした。

Research Products
(18 results)

All Other

All Publications (18 results)

[Publications] Ogawa,T. et al.: "Polar Cap Patches and Auroral Blobs Observed with Antarctic HF Radar:Preliminary Results." Proc.NIPR Symp.Upper Atmos.Phys.11. 11-18 (1997)
[Publications] Nishitani,N. et al.: "Averaged Pattern of Ionospheric Echo Region and Convection:Initial Results from the Syowa Station HF Radar" Proc.NIPR Symp.Atmos.Phys.10. 42-47 (1997)
[Publications] Saka,O. et al.: "Earth induction effect for Pc5 pulsations observed by unmanned magnetometer network near Syowa Stati,Antarctica." J.Geomag.Geoelectr.49. 1197-1204 (1997)
[Publications] Watanabe,M. and Iijima,T.: "Nightside subauroral filed-aligned current system during grest magnetic storms(Extended abstract)." Proc.NIPR Symp.Upper Atmos.,Phys.10. 135-141 (1997)
[Publications] Sato,N. et al.: "Activities and forms of pulsating auroras at the conjugate-pair observatories nere L=6." Proc.NIPR Symp.Upper Atmos.Phys.11. 134-138 (1998)
[Publications] Yang.H. et al.: "Anote on pixel intensity correction in projection transform of an all-sky image." Proc.NIPR Symp.Upper Atmos.Phys.11. 55-60 (1998)
[Publications] Lewis,R.V. et al.: "The behaviour of the electric field within the substorm current wedge." J.Geophys.Res.103. 179-190 (1998)
[Publications] Watanabe,M. et al.: "Localized bursty flow in the nightside ionosphere-Implication for distant tail reconnection(Extended abstract)." Proc.NIPR Symp.Upper Atmos.,Phys.11. 143-149 (1998)
[Publications] Fujita,Y. et al.: "Seasonal variation in the latitude of geomagnetically conjugate points observed with imaging riometers in the auroral zone" Nankyoku Shiryo(Antarctic Record). 42,1. 1-20 (1998)
[Publications] Sato,N. et al.: "Conjugacy of isolated auroral arcs and nonconjugate auroral breskups." J.Geophy.Res.(in press).
[Publications] Hashimoto,K.and Sato,N.: "Solar and particle contributions to conjugacy of eastward and westward auroral electrojet intensity." Proc.NIPR Symp.Upper Atmos.Phys.12(in press).
[Publications] Ogawa,T.: "A Review of Radar and Satellite Observations of Atmospheric Gravity Waves at Syowa Station" Proceedings of the International Symp.on Environmental Research in the Antarctic. (in press).
[Publications] Ogawa,T. et al.: "Antarctic HF Radar Observations of Irregularities Associated with Polar Patches and Auroral Blobs." J.Geophys.Res.(in press).
[Publications] Watanabe,M. et al.: "Localized activation of the distant tail neutral line just prior to substorm onsets." J.Geopy.Res.(in press).
[Publications] Watanabe,M. et al.: "Field-aligned current systems in the magnetospheric ground state." J.Geophy.Res.(in press).
[Publications] Watanabe,M. et al.: "Fast equatorwaed separatrix motion in the nightside ionosphere just prior to substorm onset(Extended abstract)." Proc.NIPR Symp.Upper Atmos.,Phys.(in press).
[Publications] Yamagishi,H. et al.: "Conjugate features of auroras observed by TV cameras and imaging riometers at auroral zone and polar cap conjugate-pair stations" Polar Cap Boundary Phenomena,ed.by A.Egeland,Netherlands,Kluwer A.P.(in press).
[Publications] Nose,M. et al.: "Electron precipitation accompanying Pc5 pulsations observed by the DE satellites and at a ground station" J.Geopy.Res.(in press).

1997 Fiscal Year Annual Research Report

SuperDARNレーダーを用いた極域電磁圏ダイナミクスの研究

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] Ogawa,T. et al.: "Polar Cap Patches and Auroral Blobs Observed with Antarctic HF Radar:Preliminary Results." Proc.NIPR Symp.Upper Atmos.Phys.11. 11-18 (1997)

[Publications] Nishitani,N. et al.: "Averaged Pattern of Ionospheric Echo Region and Convection:Initial Results from the Syowa Station HF Radar" Proc.NIPR Symp.Atmos.Phys.10. 42-47 (1997)

[Publications] Saka,O. et al.: "Earth induction effect for Pc5 pulsations observed by unmanned magnetometer network near Syowa Stati,Antarctica." J.Geomag.Geoelectr.49. 1197-1204 (1997)

[Publications] Watanabe,M. and Iijima,T.: "Nightside subauroral filed-aligned current system during grest magnetic storms(Extended abstract)." Proc.NIPR Symp.Upper Atmos.,Phys.10. 135-141 (1997)

[Publications] Sato,N. et al.: "Activities and forms of pulsating auroras at the conjugate-pair observatories nere L=6." Proc.NIPR Symp.Upper Atmos.Phys.11. 134-138 (1998)

[Publications] Yang.H. et al.: "Anote on pixel intensity correction in projection transform of an all-sky image." Proc.NIPR Symp.Upper Atmos.Phys.11. 55-60 (1998)

[Publications] Lewis,R.V. et al.: "The behaviour of the electric field within the substorm current wedge." J.Geophys.Res.103. 179-190 (1998)

[Publications] Watanabe,M. et al.: "Localized bursty flow in the nightside ionosphere-Implication for distant tail reconnection(Extended abstract)." Proc.NIPR Symp.Upper Atmos.,Phys.11. 143-149 (1998)

[Publications] Fujita,Y. et al.: "Seasonal variation in the latitude of geomagnetically conjugate points observed with imaging riometers in the auroral zone" Nankyoku Shiryo(Antarctic Record). 42,1. 1-20 (1998)

[Publications] Sato,N. et al.: "Conjugacy of isolated auroral arcs and nonconjugate auroral breskups." J.Geophy.Res.(in press).

[Publications] Hashimoto,K.and Sato,N.: "Solar and particle contributions to conjugacy of eastward and westward auroral electrojet intensity." Proc.NIPR Symp.Upper Atmos.Phys.12(in press).

[Publications] Ogawa,T.: "A Review of Radar and Satellite Observations of Atmospheric Gravity Waves at Syowa Station" Proceedings of the International Symp.on Environmental Research in the Antarctic. (in press).

[Publications] Ogawa,T. et al.: "Antarctic HF Radar Observations of Irregularities Associated with Polar Patches and Auroral Blobs." J.Geophys.Res.(in press).

[Publications] Watanabe,M. et al.: "Localized activation of the distant tail neutral line just prior to substorm onsets." J.Geopy.Res.(in press).

[Publications] Watanabe,M. et al.: "Field-aligned current systems in the magnetospheric ground state." J.Geophy.Res.(in press).

[Publications] Watanabe,M. et al.: "Fast equatorwaed separatrix motion in the nightside ionosphere just prior to substorm onset(Extended abstract)." Proc.NIPR Symp.Upper Atmos.,Phys.(in press).

[Publications] Yamagishi,H. et al.: "Conjugate features of auroras observed by TV cameras and imaging riometers at auroral zone and polar cap conjugate-pair stations" Polar Cap Boundary Phenomena,ed.by A.Egeland,Netherlands,Kluwer A.P.(in press).

[Publications] Nose,M. et al.: "Electron precipitation accompanying Pc5 pulsations observed by the DE satellites and at a ground station" J.Geopy.Res.(in press).

佐藤夏雄国立極地研究所, 情報科学センター, 教授 (50132709)