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Observational Research on ionospheric response to EUV irradiance variation of solar flares

Research Project

Project/Area Number 17540422
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionNagoya University

Principal Investigator

MASUDA Satoshi (2007)  Nagoya University, Solar-Terrestrial Environment Laboratory, Associate Professor (10262916)

佐藤 淳 (2005-2006)  名古屋大学, 大学院環境学研究科, 研究員(COE) (30397476)

Co-Investigator(Kenkyū-buntansha) NOZAWA Satonori  Nagoya University, Solar-Terrestrial Environment Laboratory, Associate Professor (60212130)
OTSUKA Yuichi  Nagoya University, Salar-Terrestrial Environment Labaratary, Assistant Professor (40314025)
FUJIKI Ken'ichi  Nagoya University, Solar-Terrestrial Environment Laboratory, Assistant Professor (20303597)
藤木 謙一  名古屋大学, 太陽地球環境研究所, 助教 (20353097)
増田 智  名古屋大学, 太陽地球環境研究所, 助教授 (10262916)
Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥2,580,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywordssolar physics / space physics / magnetosp here / ionosphere / X-ray astronomy
Research Abstract

In this research, we tried to reveal response of the ionosphere to solar activity based on observations. This research has the following four steps; (1) constitution of the database on solar flare X-rays data and EUV irradiance data, (2) observational studies on characteristics of solar flares, (3) development of the method of EUV data analysis and data analysis itself and (4) observational studies on increase of total numbers of electrons (so-called TEC) in the ionosphere due to solar flares. As for the step (1), we made a 10-year catalogue/database for solar flares observed with Yohkoh, including the information of X-ray light curves and flare images. By using this catalogue, we analyzed solar flares statistically for the next step (2). Then, we estimated the density of the solar atmosphere where hard X-rays are emitted. It is also shown that the density depends on energy of the X-ray photons. In the step (3), we developed a new method which estimates EUV flux from soft X-ray flux during solar flares. Because the time resolution is very bad while soft X-ray data are taken continuously. Thanks to this method, we can get virtual EUV flux data any time. In addition to this, we compared EUV flux, F10.7 index, tar (total solar irradiance), and soft X-ray data Then we hard that F10.7 index correlates EUV flux, but can not be used for In the final step (4), we compared zenith angle of the sun, flare intensity, and TEC statistically and revealed that increase of TEC linearly correlated EUV flux from solar flares. The good correlation between TEC derived inn GPS data and EUV flux, indicates that the F-layer of the ionosphere could affect GPS signals. Finally, we found an asymmetry of TEC variations bath in the summer and winter hemispheres. This result suggests that the ionospheric response to EUV flux variations depends on the background condition of the atmosphere

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (46 results)

All 2008 2007 2006 2005

All Journal Article (20 results) (of which Peer Reviewed: 9 results) Presentation (25 results) Book (1 results)

  • [Journal Article] Summer-winter hemispheric asymmetry of the sudden increase in ionospheric total electron content and of the O/N2 ratio: Solar activity dependence.2007

    • Author(s)
      Tsugawa, T., S. R- Zhang, A. J. Coster, Y. Otsuka, J. Sato, A. Saito, 他2名
    • Journal Title

      J. Geophys. Res. 112

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Medium-scale traveling ionospheric disturbances detected with dense and wide TEC maps over North America2007

    • Author(s)
      Tsugawa, T., Y. Otsuka, A. J. Coster, and A. Saito
    • Journal Title

      Geophys. Res. Lett. 34

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Imaging Spectroscopy of a Gradual Hardening Flare on 2000 November 252007

    • Author(s)
      Takasaki, H., J. Kiyohara, A. Asai, H. Nakajima, T. Yokoyama, S. Masuda, J. Sato, 他1名
    • Journal Title

      Astrophys. J. 661

      Pages: 1234-1241

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Summer-winter hemispheric asymmetry of the sudden increase in ionospheric total electron content and of the O/N2 ratio : Solar activity dependence2007

    • Author(s)
      Tsugawa, T., S. R-Zhang, A. J. Coster, Y. Otsuka, J. Sato, A. Saito, et. al.
    • Journal Title

      J. Geophys. Res 112, A08301

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Medium-scale traveling ionospheric disturbances detected with dense and wide TEC maps over North America2007

    • Author(s)
      Tsugawa, T., Y. Otsuka, A. J. Coster, A. Saito
    • Journal Title

      Geophys. Res. Lett 34, L22101

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Imaging Spectroscopy of a Gradual Hardening Flare on 2000 November 252007

    • Author(s)
      Takasalci, H., J. Kiyohara, A. Asai, H. Nakajima, T. Yokoyama, S. Masuda, J. Sato, T. Kosugi
    • Journal Title

      ApJ 661

      Pages: 1234-1241

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Summer-winter hemispheric asymmetry of the sudden increase in ionospheric total electron content and of the O/N2 ratio: Solar activity dependence2007

    • Author(s)
      Tsugawa, T., S. R-Zhang, A. J. Coster, Y. Otsuka, J. Sato, A. Saito 他2名
    • Journal Title

      J. Geophys. Res. 112

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Imaging Spectroscopy of a Gradual Hardening Flare on 2000 November 252007

    • Author(s)
      Takasaki, H., J. Kiyohara, A. Asai, H. Nakajima, T. Yokoyama, S. Masuda, J. Sato 他1名
    • Journal Title

      Astrophys. J. 661

      Pages: 1234-1241

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Summer-winter hemispheric asymmetry of sudden increase in ionospheric total electron content induced by solar flares: A role of O/N_2 ratio2006

    • Author(s)
      Tsugawa, T., T. Sadakane, J. Sato, Y. Otsuka, T. Ogawa, K. Shiokawa, and A. Saito
    • Journal Title

      Journal of Geophysical Research 111

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Yohkoh/WBS recalibration and comprehensive catalogue of solar flares observed by Yohkoh SXT, HXT and WBS instruments2006

    • Author(s)
      Sato, J., Y. Matsumoto, K. Yoshimura, S. Kubo, J. Kotoku, S. Masuda, 他5名
    • Journal Title

      Solar Physics 236

      Pages: 351-368

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Average height of the hard X-ray footpoint sources in solar flares2006

    • Author(s)
      Sato, J.
    • Journal Title

      Adv. Space Res. 38

      Pages: 968-971

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Summer-winter hemispheric asymmetry of sudden increase in ionospheric total electron content induced by solar flares : A role of O/N2 ratio2006

    • Author(s)
      Tsugawa, T., T. Sadakane, J. Sato, Y. Otsuka, T. Ogawa, K. Shiokawa, A. Saito
    • Journal Title

      J. Geophys. Res 111, A11316

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Yohkoh/WBS recalibration and comprehensive catalogue of solar flares observed by Yohkoh SXT, HXT and WBS instruments2006

    • Author(s)
      Sato, J., Y. Matsumoto, K. Yoshimura, S. Kubo, J. Kotoku, S. Masuda, M. Sawa, K. Suga, M. Yoshimori, T. Kosugi, T. Watanabe
    • Journal Title

      Solar Physics 236

      Pages: 351-368

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Average height of the hard X-ray footpoint sources in solar flares2006

    • Author(s)
      Sato, J
    • Journal Title

      Adv. Space Res 38

      Pages: 968-971

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Summer-winter hemispheric asymmetry of sudden increase in ionospheric total electron content induced by solar flares : A role of O/N_2 ratio2006

    • Author(s)
      Tsugawa, T., Sadakane, T., Sato, J., Otsuka, Y., Ogawa, T., Shiokawa K., Saito, A.
    • Journal Title

      Journal of Geophysical Research 111

    • Related Report
      2006 Annual Research Report
  • [Journal Article] YOKOH/WBS REECALIBRATION AND THE COMPREHENSIVE CATALOGUE OF SOLAR FLARES OBSERVED BY YOHKOH SXT, HXT AND WBS INSTRUMENTS2006

    • Author(s)
      Sato, J., Matsumoto, Y., Yoshimura, K., Kubo, S., Kotoku, J., Masuda, S., Sawa, M., Suga, K., Yoshimori, M., Kosugi, T., Watanabe, T.
    • Journal Title

      Solar Phys. (掲載予定)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Transition region of TEC enhancement phenomena during geomagnetically disturbed periods at mid-latitudes2005

    • Author(s)
      Unnikrishnan, K., A. Saito, Y. Otsuka, M. Yamamoto, and S. Fukao
    • Journal Title

      Ann. Geophysicae 23

      Pages: 3439-3450

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Observations of 115-1600 nm solar spectral irradiance variations by the SORCE satellite2005

    • Author(s)
      Yokoyama, M., S. Masuda, and J. Sato
    • Journal Title

      Proceedings of the Sixth International Conference on Global Change: Connection to the Arctic

      Pages: 126-129

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Transition region of TEC enhancement phenomena during geomagnetically disturbed periods at mid-latitudes2005

    • Author(s)
      Unnikrishnan, K. A., Saito, Y. Otsuka, M. Yamamoto, S. Fukao
    • Journal Title

      Ann. Geophysicae 23

      Pages: 3439-3450

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Observations of 115-1600 nm solar spectral irradiance variations by the SORCE satellite2005

    • Author(s)
      Yokoyama, M., S. Masuda, J. Sato
    • Journal Title

      in Proceedings of the Sixth International Conference on Global Change : Connection to the Arctic, Committee of the University Consortium for GCCA

      Pages: 126-129

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A challenge for reconstruction of solar spectral irradiance at the top of earth's atmosphere using Ca-K full-sun images2007

    • Author(s)
      Yokoyama, M. and S. Masuda
    • Organizer
      International CAWSES symposium
    • Place of Presentation
      京都大学(京都市)
    • Year and Date
      2007-10-23
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A challenge for reconstruction of solar spectral irradiance at the top of earth's atmosphere using Ca-K full-sun image2007

    • Author(s)
      Yokoyama, M., S. Masuda
    • Organizer
      International CAWSES symposium
    • Place of Presentation
      Kyoto, Japan
    • Year and Date
      2007-10-23
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 太陽活動極小期における太陽の非活動領域のEUV放射とその特徴2007

    • Author(s)
      横山正樹、増田智
    • Organizer
      第122回SGEPSS講演会
    • Place of Presentation
      名古屋大学(名古屋市)
    • Year and Date
      2007-09-30
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] EUV radiation and its characteristics in non-active regions during the solar avidity minimum2007

    • Author(s)
      Yokoyama, M., S. Masuda
    • Organizer
      SGEPSS
    • Place of Presentation
      Nagoya, Japan
    • Year and Date
      2007-09-30
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Summer-winter hemispheric asymmetry of sudden increase in ionospheric TEC and O/N2 ratio: Solar activity dependence2007

    • Author(s)
      Tsugawa, T., S. -R. Zhang, A. J. Coster, Y. Otsuka, J. Sato, A. Saito, and Y. Zhang
    • Organizer
      日本地球惑星科学連合 2007年大会
    • Place of Presentation
      幕張メッセ(千葉市)
    • Year and Date
      2007-05-22
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Summer-winter hemispheric asymmetry of sudden increase in ionospheric TEC and O/N2 ratio: Solar activity dependence2007

    • Author(s)
      Tsugawa, T., S. -R. Zhang, A. J. Coster, Y. Otsuka, J. Sato, A. Saito, and Y. Zhang
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      幕張メッセ(千葉市)
    • Year and Date
      2007-05-22
    • Related Report
      2007 Annual Research Report
  • [Presentation] Summer-winter hemispheric asymmetry of sudden increase in ionospheric TEC and O/N2 ratio : Solar activity dependence2007

    • Author(s)
      Tsugawa, T., S.-R., Zhang, A.J. Coster, Y. Otsuka, J. Sato, A. Saito, et. al.
    • Organizer
      JPGU
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2007-05-19
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Summer-Winter Hemispheric Asymmetry of Sudden Increase in Ionospheric Total Electron Content2006

    • Author(s)
      Tsugawa. T., S. -R. Zhang, A. J. Coster, Y. Otsuka, J. Sato, A. Saito, Y. Zhang, and L. Paxton
    • Organizer
      AGU fall meeting
    • Place of Presentation
      San Francisco, USA
    • Year and Date
      2006-12-11
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Reconstruction of the Past Solar Spectra(1)Deduced Solar Spectra of Sunspots, Faculae and Quiet Regions2006

    • Author(s)
      Yokoyama, M., S. Masuda, and J. Sato
    • Organizer
      AGU fall meeting
    • Place of Presentation
      San Francisco, USA
    • Year and Date
      2006-12-11
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Reconstruction of the Past Solar Spectra (1) Deduced Solar Spectra of Sunspots, Faculae and Quiet Regions2006

    • Author(s)
      Yokoyama, M., S. Masuda, J. Sato
    • Organizer
      AGU fall meeting
    • Place of Presentation
      San Francisco, USA
    • Year and Date
      2006-12-11
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Study of Sudden Increases in Total Electron Content Induced by Solar Flares Using Observations and Models2006

    • Author(s)
      Tsugawa, T., S. Katoh, J. Sato, H. Fujiwara, Y. Otsuka, T. Ogawa, K. Shiokawa, and A. Saito
    • Organizer
      CEDAR Workshop
    • Place of Presentation
      Santa Fe, USA
    • Year and Date
      2006-06-19
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 太陽フレアスペクトルと電離圏全電子数の応答に関する統計的研究II2006

    • Author(s)
      佐藤淳、津川卓也
    • Organizer
      日本地球惑星科学連合 2006年大会
    • Place of Presentation
      幕張メッセ(千葉市)
    • Year and Date
      2006-05-14
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] GPS観測とモデル計算を用いた太陽フレアによる電離圏全電子数突然増加の研究2006

    • Author(s)
      津川卓也、加藤修平、佐藤淳、藤原均、大塚雄一、小川忠彦、塩川和夫、齊藤昭則
    • Organizer
      日本地球惑星科学連合 2006年大会
    • Place of Presentation
      幕張メッセ(千葉市)
    • Year and Date
      2006-05-14
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 黒点・白斑・静穏領域の面積変化にともなう太陽放射スペクトルの変動2006

    • Author(s)
      横山正樹、増田智、佐藤淳
    • Organizer
      日本地球惑星科学連合 2006年大会
    • Place of Presentation
      幕張メッセ(千葉市)
    • Year and Date
      2006-05-14
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Statistical study on solar flare spectra and TEC variations2006

    • Author(s)
      Sato, J., Tsugawa, T
    • Organizer
      JPGU
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2006-05-14
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Study on the sudden increase of TEC due to solar flares based on GPS observations and model calculations2006

    • Author(s)
      Tsugawa, T., S. Kato, J. Sato, H. Fujiwara, Y. Otsuka, T. Ogawa, et. al.
    • Organizer
      JPGU
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2006-05-14
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Solar spectral variations accompanying with the area variations of sunspots, faculae, and quiet regions2006

    • Author(s)
      Yokoyama, M., S. Masuda, J. Sato
    • Organizer
      JPGU
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2006-05-14
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A Statistical Investigation of Sudden Increases in Total Electron Content Induced by Solar Flares Using GPS Receiver Networks2006

    • Author(s)
      T. Tsugawa, T. Sadakane, J. Sato, Y. Otsuka, T. Ogawa, K. Shiokawa, and A. Saito
    • Organizer
      SCOSTEP 11th Quadrennial Solar Terrestrial Physics Symposium "Sun, Space Physics and Climate"
    • Place of Presentation
      Rio de Janeiro, Brazil
    • Year and Date
      2006-03-06
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A Statistical Investigation of Sudden Increases in Total Electron Content Induced by Solar Flares Using GPS Receiver Networks2006

    • Author(s)
      T. Tsugawa, T. Sadakane, J. Sato, Y. Otsuka, T. Ogawa, et. al.
    • Organizer
      SCOSTEP 11th Quadrennial Solar Terrestrial Physics Symposium
    • Year and Date
      2006-03-06
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 太陽フレアスペクトルと電離圏全電子数の応答に関する統計的研究2005

    • Author(s)
      佐藤淳、津川卓也、定兼貴之、増田智、大塚雄一、横山正樹
    • Organizer
      第118回SGEPSS講演会
    • Place of Presentation
      京都大学(京都市)
    • Year and Date
      2005-09-28
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] GPS受信機網を用いた太陽フレアによる電離圏全電子数突然増加の統計的研究2005

    • Author(s)
      津川卓也、定兼貴之、佐藤淳、大塚雄一、小川忠彦、塩川和夫、斉藤 昭則
    • Organizer
      第118回SGEPSS講演会
    • Place of Presentation
      京都大学(京都市)
    • Year and Date
      2005-09-28
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Statistical study on solar flare spectra and TEC variations2005

    • Author(s)
      Sato, J., T. Tsugawa, T. Sadakane, S. Masuda, Y. Otsuka, et. al.
    • Organizer
      SGEPSS
    • Place of Presentation
      Kyoto, Japan
    • Year and Date
      2005-09-28
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Statistical study on sudden increase of TEC due to solar flares2005

    • Author(s)
      Tsugawa, T., T. Sadakane, J. Sato, Y. Otsuka, T. Ogawa, et. al.
    • Organizer
      SGEPSS
    • Place of Presentation
      Kyoto, Japan
    • Year and Date
      2005-09-28
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 太陽フレアにおけるGPS-TEC値の太陽天頂角依存性2005

    • Author(s)
      佐藤淳、定兼貴之、津川卓也、大塚雄一、増田智
    • Organizer
      日本地球惑星科学連合 2005年大会
    • Place of Presentation
      幕張メッセ(千葉市)
    • Year and Date
      2005-05-22
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Zenith-angle dependence of GPS-TEC during solar flares2005

    • Author(s)
      Sato, J., T. Sadakane, T. Tsugawa, Y. Otsuka, S. Masuda
    • Organizer
      Rio de Janeiro, Brazil JPGU
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2005-05-22
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Book] 新しい地球学 太陽-地球-生命圏相互作用系の変動学2008

    • Author(s)
      佐藤淳(22名の共著者の一人)
    • Total Pages
      341
    • Publisher
      名古屋大学出版会
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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