1998 Fiscal Year Annual Research Report

南大西洋域磁気異常帯での超高層現象の研究

Research Project

Project/Area Number	09874094
Research Institution	Kyushu University
Principal Investigator	湯元清文九州大学, 理学部, 教授 (20125686)
Co-Investigator(Kenkyū-buntansha)	立原裕司九州大学, 理学部, 助手 (00227092) 河野英昭九州大学, 理学部, 助教授 (60304721) 行松彰国立極地研究所, 研究系, 助手 (70260007) 藤高和信放射線医学総合研究所, 第3研究グループ, 総合研究官 (70165398) 巻田和男拓殖大学, 工学部, 教授 (40129945)
Keywords	南大西洋域磁気異常 / 超高層現象 / 地球磁場減少 / 高エネルギー粒子 / 地球環境 / 影響評価 / 調査研究の集会 / 国際共同観測
Research Abstract	本研究目的は、地磁気強度が日本付近の半分程度と異常に弱く磁場減少率が異常に大きいブラジル南部地域で、超高層や中層大気圏における諸現象の形態学的な調査を行い、将来予想される汎地球的な地球磁場減少がもたらすであろう宇宙からの高エネルギー粒子の入射量増加に伴って、どのように地球環境が変動するかについての影響評価とその予測を行うことであり、そのためにどのような共同観測調査が必要なのか等を研究することである。平成10年度も磁気異常帯での超高層異常現象の研究をする際、どのような観測項目をどの程度の観測精度で、いかなる方法により測定すべきかの調査研究のための研究集会を再度開催した。国内の学際的な分野の研究者を交え共同で研究する為の情報交換の場として、1998年5月下旬に開催された地球惑星科学関連合同大会や、10月の名古屋大学太陽地球環境研究所で開催された研究集会と協賛した会合の場を設けた。具体的には、放射線計測を航空機や気球で行うことや、光学観測、オゾン観測、自然電波観測、宇宙雑音電波観測、地磁気観測を行う場合の測定器の感度をどの程度にすべきか検討した。また、磁気異常帯は広範囲に及んでいるため、船舶による広域観測や地磁気共役点(ブラジル-トリニダード)での比較観測の調査についても検討し、理論的な予測研究を行なった。以上のような情報交換や予備調査研究を行うことによって、“南大西洋域磁気異常帯での超高層現象の研究"の研究対象をしぼり込み、具体的な国際学術調査や現地研究者との共同研究への発展の可能性を探ることができた。

Research Products
(17 results)

All Other

All Publications (17 results)

[Publications] Li., Y., B. J. Fraser、 F. W. Menk, D. J. Webster, and K. Yumoto: "Properties and Sources of low and very low latitude Pi 2 pulsations" J. Geophys. Res.103, No.A4. 2343-2358 (1998)
[Publications] Sibeck, D. G., Takahashi, K. Yumoto, and G. D. Reeves: "Concerning the origin of signatures in dayside equatorial ground magnetograms" J. Geophys. Res.103, No.A4. 6763-6769 (1998)
[Publications] Tanaka, Y. -M., K.Yumoto, M. Shinohara, S. I. Solovyev, E. F. Vershinin, B. J. Fraser and D. Cole: "Coherent Pc 3 pulsations in the prenoon sector observed along the 210 deg. magnetic meridian" Geophys. Res. Lett.25, No.18. 3477-3480 (1998)
[Publications] Vershinin, E. F., A. V. Buzevich, K. Yumoto, K. Saita, and Y. Tanaka: "Correlations of seismic activity with electromagnetic emssions and variations in Kamchatka region" Monograph on " Seismo-Atmospheric and-Ionospheric Electromagnetic Phenomenas. (in press).
[Publications] Colqui, R., K. Yumoto, H. Tachihara, T-I Kitamura, N.B. Trivedi, and J. M. ds Costa: "Two-dimensional equational current system deduced from the Brazilian network, 1. based on the H component" Mem. Fac. Sci., Kyushu Univ., Ser. D, Earth Planet. Sci.vol.30, No.1. 1-14 (1998)
[Publications] 巻田和男: "ブラジル磁気異常帯の観測概況と計画" STEシンポジウム、名古屋大学. 4-5 (1998)
[Publications] Saka, O., T. Kitamura, H. Tachihara, M. Shinohara, N. B. Trivedi, G. D. Reeves, and T. L. hansen: "Amplitude modulation of the equatorial electrojet (EEJ) during a magnetospheric storm" Jour. Atmos. Solar-Terr. Phys.vol.60. 1129-1137 (1998)
[Publications] 藤高和信: "宇宙と地球の放射線環境-その未来予測への挑戦-" 地球. 22. 5-8 (1998)
[Publications] 藤高和信: "宇宙と地球の放射線環境の進化" 地球. 22. 17-25 (1998)
[Publications] Kikuchi T., M. Pinnock, A. Rodger, H. Luehr, T. Kitamura, H. Tachihara, M. Watanabe, N. Sato, and M. Ruohoniemi: "Global evolution of a substorm-associated DP2 current system observed by Super DARN and magnetometers" Advances in Space Research. (in press).
[Publications] Kawano, H., R. Nakamura, S. Kokubun, T. Mukai, T. Yamamoto, K. Yumoto, and A. Slavin: "Substorm-associated shrinkage of the mid-tail magnetosphere : IACG Campaign #2" Advances in Space Research. (in press).
[Publications] Abdu, M. A., J. H. Sastri, H. Luhr, H. Tachihara, T. Kitamura, N. B. Trivedi, and J. H. A. Sobral: "DP 2 electric field fluctuations in the dusk-time dip equatorial ionosphere" Geophys. Res. Lett.VOL.25, NO.9. 1511-1514 (1998)
[Publications] Kikuchi, T., H. Luhr, K. Schlegel, T. -I. Kitamura, and H. Tachihara: "Instantaneous penetration of electric fields associated with Region-1 and 2 fiels-aligned currents during a substorm as deduced from the EISCAT and the polar and equatorial magnetometer arrays" J. Geophys. Res.(in press).
[Publications] Itonaga, M., A. Yoshikawa, and K. Yumoto: "Transient response of the non-uniform equatorial ionosphere to compressional MHD waves" J. Atmos. Solar-Terr. Phys.Vol.60, No.2. 253-261 (1998)
[Publications] Itonaga, M., and K. Yumoto: "ULF waves and the ground magnetic field" J. Geophys. Res.Vol.103, No.A5. 9295-9291 (1998)
[Publications] Itonaga, M., A. Yoshikawa, K. Yumoto, and S. Fujita: "Transient response of the non-uniform equatorial ionosphere to the ionospheric current of polar origin" 1998 Western Pacific Geophysics Metting, Taipei. SP41A-17 (1998)
[Publications] Fujita, S., and M. Itonaga: "On instantaneous horizontal transmission of magnetic signals associated with the incident Alfven mode impulse from high-latitudes to middle-and low-latitudes" AGU 1998 Fall Meeting, San Francisco. SM41B-07 (1998)

1998 Fiscal Year Annual Research Report

南大西洋域磁気異常帯での超高層現象の研究

Principal Investigator

湯元 清文 九州大学, 理学部, 教授 (20125686)

Research Products

[Publications] Li., Y., B. J. Fraser、 F. W. Menk, D. J. Webster, and K. Yumoto: "Properties and Sources of low and very low latitude Pi 2 pulsations" J. Geophys. Res.103, No.A4. 2343-2358 (1998)

[Publications] Sibeck, D. G., Takahashi, K. Yumoto, and G. D. Reeves: "Concerning the origin of signatures in dayside equatorial ground magnetograms" J. Geophys. Res.103, No.A4. 6763-6769 (1998)

[Publications] Tanaka, Y. -M., K.Yumoto, M. Shinohara, S. I. Solovyev, E. F. Vershinin, B. J. Fraser and D. Cole: "Coherent Pc 3 pulsations in the prenoon sector observed along the 210 deg. magnetic meridian" Geophys. Res. Lett.25, No.18. 3477-3480 (1998)

[Publications] Vershinin, E. F., A. V. Buzevich, K. Yumoto, K. Saita, and Y. Tanaka: "Correlations of seismic activity with electromagnetic emssions and variations in Kamchatka region" Monograph on " Seismo-Atmospheric and-Ionospheric Electromagnetic Phenomenas. (in press).

[Publications] Colqui, R., K. Yumoto, H. Tachihara, T-I Kitamura, N.B. Trivedi, and J. M. ds Costa: "Two-dimensional equational current system deduced from the Brazilian network, 1. based on the H component" Mem. Fac. Sci., Kyushu Univ., Ser. D, Earth Planet. Sci.vol.30, No.1. 1-14 (1998)

[Publications] 巻田和男: "ブラジル磁気異常帯の観測概況と計画" STEシンポジウム、名古屋大学. 4-5 (1998)

[Publications] Saka, O., T. Kitamura, H. Tachihara, M. Shinohara, N. B. Trivedi, G. D. Reeves, and T. L. hansen: "Amplitude modulation of the equatorial electrojet (EEJ) during a magnetospheric storm" Jour. Atmos. Solar-Terr. Phys.vol.60. 1129-1137 (1998)

[Publications] 藤高和信: "宇宙と地球の放射線環境-その未来予測への挑戦-" 地球. 22. 5-8 (1998)

[Publications] 藤高和信: "宇宙と地球の放射線環境の進化" 地球. 22. 17-25 (1998)

[Publications] Kikuchi T., M. Pinnock, A. Rodger, H. Luehr, T. Kitamura, H. Tachihara, M. Watanabe, N. Sato, and M. Ruohoniemi: "Global evolution of a substorm-associated DP2 current system observed by Super DARN and magnetometers" Advances in Space Research. (in press).

[Publications] Kawano, H., R. Nakamura, S. Kokubun, T. Mukai, T. Yamamoto, K. Yumoto, and A. Slavin: "Substorm-associated shrinkage of the mid-tail magnetosphere : IACG Campaign #2" Advances in Space Research. (in press).

[Publications] Abdu, M. A., J. H. Sastri, H. Luhr, H. Tachihara, T. Kitamura, N. B. Trivedi, and J. H. A. Sobral: "DP 2 electric field fluctuations in the dusk-time dip equatorial ionosphere" Geophys. Res. Lett.VOL.25, NO.9. 1511-1514 (1998)

[Publications] Itonaga, M., A. Yoshikawa, and K. Yumoto: "Transient response of the non-uniform equatorial ionosphere to compressional MHD waves" J. Atmos. Solar-Terr. Phys.Vol.60, No.2. 253-261 (1998)

[Publications] Itonaga, M., and K. Yumoto: "ULF waves and the ground magnetic field" J. Geophys. Res.Vol.103, No.A5. 9295-9291 (1998)

[Publications] Itonaga, M., A. Yoshikawa, K. Yumoto, and S. Fujita: "Transient response of the non-uniform equatorial ionosphere to the ionospheric current of polar origin" 1998 Western Pacific Geophysics Metting, Taipei. SP41A-17 (1998)

[Publications] Fujita, S., and M. Itonaga: "On instantaneous horizontal transmission of magnetic signals associated with the incident Alfven mode impulse from high-latitudes to middle-and low-latitudes" AGU 1998 Fall Meeting, San Francisco. SM41B-07 (1998)

湯元清文九州大学, 理学部, 教授 (20125686)