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Design study of the heliospheric imager

Research Project

Project/Area Number 10554022
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Space and upper atmospheric physics
Research InstitutionNagoya University

Principal Investigator

TOKUMARU Munetoshi  Nagoya University, Solar-Terestrial Environment Laboratory, Associate Professor, 太陽地球環境研究所, 助教授 (60273207)

Co-Investigator(Kenkyū-buntansha) 藤木 謙一  名古屋大学, 太陽地球環境研究所, 助手 (20303597)
小島 正宜  名古屋大学, 太陽地球環境研究所, 教授 (70023687)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1999: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1998: ¥4,200,000 (Direct Cost: ¥4,200,000)
Keywordssolar wind / CME / interplanetery scintillation / tomography / radio observation / アレーアンテナ / プラズマ / トモグラフィー法
Research Abstract

Research of a new instrument for imaging heliosphere (heliospheric imager) and related studies have been done.
(1) Heliospheric Imager
In the first year, we designed the heliospheric imager. Very large effective area at least 3000mィイD12ィエD1 and reducing urban noise about 30dB are required to observe weak radio sources. For these reasons. a phase array antenna surrounded by metallic-fence with 10m height was adopted for the heliospheric imager. Thus we designed a phased array which consists of 16384 λ/2-dipole elements (256E-W) x 64(N-S), 3500mィイD12ィエD1). The sensitivity of the antenna is expected to be 0.2 Jy which will be the highest one among those of the current IPS network in our laboratory.
Various parts such as a dipole element, a schpertop balun and connectors are developed and tested electric performance. Especially these are designed for mass production to cut down the cost. We success to develop a low ohmic-loss (-0.02dB) connector which can be used in the heliospheric imager. And also suitable cable (MFH-8AC) was found which have enough strength and low velocity factor.
In the second year, we built a small phased array antenna (16(E-W) x 8(N-S), 32mィイD12ィエD1 to check our design. The antenna impedance is measured to be about 170Ω which well agrees with design calculation. The Sun and QSOs (3C273, 3C405) were observed to measure beam size, system temperature and aperture area, and they are 6.5 degree (FWHP), 290 K and 17mィイD12ィエD1 respectively. These values also agree with calculated ones. In conclusion, the design can be applied to the heliospheric imager.
(2) Related Studies
Origin compact very low speed solar wind and propagation of interplanetary disturbances measured with IPS were studied in these two years. These analysis techniques will be applied to new observations with the heliospheric imager. We expect that the new data will provide us further insights of dynamical phenomena in heliosphere.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] Tokumaru, M. et al.: "Three-Dimensional propagation of interplanetary disturbances detected with radio scintillation measurement at 327MHz"Journal of Geophysical Research. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hakamada, K. et al.: "Solar wind speed and expansion rate of the coronal magnetic fields during carrington rotation 1909"Solar Physics. 187. 115-122 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kojima M. et al.: "The highest solar wind velocity in a polar region estimated from IPS tomography analysis"Space Science Review. 87. 237-239 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kojima, M. et al.: "Low-speed solar wind association with active regions near solar minimum"Advanced Space Research. 25. 1893-1896 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tokumaru, M. et al.: "Large-scale structure of solar wind turbulence near solar-activity minimum"Advanced Space Research. 25. 1943-1946 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yokobe, A. et al.: "Radial distance depencence of the solar wind speed at high latitudes observed by interplanetary scintillation"Advanced Space Research. 25. 1947-1950 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tokumaru, M. et al.: "Three-Dimensional propagation od interplanetary disturbances detected with radio scintillation measurement at 327 MHz"Journal of Geophysical Research. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hakamada, K. et al.: "Solar wind speed and expansion rate of the coronal magnetic fields during carrington rotation 1909"Solar Physics. 187. 115-122 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kojima, M. et al.: "The highest solar wind velocity in a polar region estimated from IPS tomography analysis"Space Science Review. 87. 237-239 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kojima, M. et al.: "Low-speed solar wind association with active regions near solar minimum"Advanced Space Research. 25. 1893-1896 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tokumaru, M. et al.: "Large-scale structure of solar wind turbulence near solar-activity minimum"Advanced Space Research. 25. 1943-1946 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yokobe, A. et al.: "Radial distance dependence of the solar wind speed at high latitudes observed by interplanetary scintillation"Advanced Space Research. 25. 1947-1950 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tokumaru, M. et al.: "Three-Dimensional propagation of interplanetary disturbances detected with radio scintillation measurement at 327 MHz"Journal of Geophysical Research. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hakamada, K. et al.: "Solar wind speed and expansion rate of the coronal magnetic fiels during carrington rotation 1909"Solar Physics. 187. 115-122 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kojima, M. et al.: "The highest solar wind velocity in a polar region estimated from IPS tomography analysis"Space Science Review. 87. 237-239 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kojima, M. et al.: "Low-speed solar wind association with active regions near solar minimum"Advanced Space Research. 25. 1893-1896 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Tokumaru, M. et al.: "Large-scale structure of solar wind turbulence near solar-activity minimum"Advanced Space Research. 25. 1943-1946 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yokobe, A. et al.: "Radial distance depencence of the solar wind speed at high latitudes observed by interplanetary scintillation"Advanced Space Research. 25. 1947-1950 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kojima,M: "Solar wind measured by interplanetary scintillation method" “Solar Wind Nine", AIP Conference Proceedings,in press.

    • Related Report
      1998 Annual Research Report
  • [Publications] Yokobe, A.: "Comparison of Solar Wind Speed with coronagraph data analyzed by tomography" “Solar Wind Nine", AIP Conference Proceedings,in press.

    • Related Report
      1998 Annual Research Report
  • [Publications] Tokumaru, M.: "Large-scale structure of solar wind turbulence near solar activity minimum" Advances in Space Research. (in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] Ananthakrishnan, S.: "Origin of travelling interplanetary disturbances" Advances in Space Research. (in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] Kojima, M.: "Low-speed solar wind associations with active regions near solar minimum" Advances in Space Research. (in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] Kojima, M.: "The highest solar wind velocity in a polar region estimated from IPS tomography analysis" Proceedings of SOHO 7 Workshop. (in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] Kojima, M.: "The highest solar wind velocity in a polar region estimated from IPS tomography analysis" Proceedings of SOHO 7 Workshop. (in press).

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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