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Study of generating mechanism of ionospheric field-aligned irregularities and E- and F-region coupling

Research Project

Project/Area Number 15340164
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

YAMAMOTO Mamoru  Kyoto Univ., Research Institute for Sustainable Humanosphere, Assoc. Prof., 生存圏研究所, 助教授 (20210560)

Co-Investigator(Kenkyū-buntansha) FUKAO Shoichiro  Kyoto Univ., Research Institute for Sustainable Humanosphere, Prof., 生存圏研究所, 教授 (30026249)
HASHIGUCHI Hiroyuki  Kyoto Univ., Research Institute for Sustainable Humanosphere, Assoc. Prof., 生存圏研究所, 助教授 (90293943)
NAKAMURA Takuji  Kyoto Univ., Research Institute for Sustainable Humanosphere, Assoc. Prof., 生存圏研究所, 助教授 (40217857)
SAITO Akinori  Kyoto Univ., Graduate School of Informatics, Research Assoc., 理学研究科, 助手 (10311739)
OGAWA Tadahiko  Nagoya Univ., Solar-Terrestrial Environmental Research Lab., Prof., 太陽地球環境研究所, 教授 (60271607)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥13,300,000 (Direct Cost: ¥13,300,000)
Fiscal Year 2004: ¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2003: ¥4,100,000 (Direct Cost: ¥4,100,000)
Keywordsmidlatitude ionosphere / E- and F-region coupling / radar observations / ionospheric irregularity / simultaneous multi-point observations / lowlatitude ionosphere / 中低緯度電離圏
Research Abstract

Polarization electric fields in mid- and low-latitude ionosphere propagate along the geomagnetic field with small attenuation. Close electromagnetic coupling processes are thus expected in the E-region and F-region owing to this effect. They are, however, difficult to be observed. In this project we studied the electrodynamic coupling processes by means of simultaneous observations of E- and F-region ionospheric irregularities along the same geomagnetic field.
1.We conducted FERIX (F- and E-Region Ionospheric Coupling Study) in June-August 2004. The MU radar in Shigaraki observed the F-region irregularities while E-region irregularities along the same geomagnetic field were observed with LTPR (Lower Thermosphere Profiler Radar) located in Sakata, Yamagata. During the experiment, National Institute of Information and Communications Technology (NICT) operated FM-CW ionosondes in three locations in Tohoku including Sakata. Observations with atmospheric imagers and total-electron content (T … More EC) measurement with the GEONET GPS network were conducted as well. The results show that, when F-region irregularities were active, intense E-region irregularities appear at the field-associated region, and they moved westward with the same phase speed. F-region irregularities appeared at the depleted region of the GPS-TEC with middle-scale traveling ionospheric disturbances (MS-TID) patterns. It is possible that polarization electric fields in both regions resonant each other to develop the associated wavelike structures.
2.We also compared low-latitude irregularity echoes from the equatorial atmosphere radar (EAR) in West Sumatra, Indonesia and behavior of the background ionosphere with the meridional ionosonde chain SEALION by NICT. We found that E-region irregularities were suppressed when the equatorial Spread-F (ESF) was onset. This behavior was explained by the control of E-region irregularities by the polarization electric field from the ESF event.
3.From these results, we could successfully clarify the importance of E- and F-region coupling processes in understanding the mid- and low-latitude ionosphere. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (24 results)

All 2005 2004 Other

All Journal Article (18 results) Publications (6 results)

  • [Journal Article] SEEK-2 (Sporadic-E Experiment over Kyusyu 2) -- Project Outline and Significance --2005

    • Author(s)
      Yamamoto, M., S.Fukao, R.T.Tsunoda, R.Pfaff, H.Hayakawa
    • Journal Title

      Ann. Geophys. 23巻

      Pages: 2295-2305

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] The first coordinated observations of mid-latitude E-region quasi-periodic radar echoes and lower thermospheric 557.7-nm airglow2005

    • Author(s)
      Ogawa, T., Y.Otsuka, F.Onoma, K.Shiokawa, M.Yamamoto
    • Journal Title

      Ann. Geophys. 23巻

      Pages: 2291-2399

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Disruption of E Region Echoes Observed by the EAR during the Development Phase of Equatorial Spread F : A Manifestation of Electrostatic Field Coupling2005

    • Author(s)
      Patra, A.K., T.Yokoyama, M.Yamamoto, S.Saito, T.Maruyama, S.Fukao
    • Journal Title

      O 32巻

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] SEEK-2 (Sporadic-E Experiment over Kyusyu 2) - Project Outline and Significance -2005

    • Author(s)
      Yamamoto, M., S.Fukao, R.T.Tsunoda, R.Pfaff, H.Hayakawa
    • Journal Title

      Ann.Geophys. Vol.23

      Pages: 2295-2305

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] The first coordinated observations of mid-latitude E-region quasi-periodic radar echoes and lower thermospheric 557.7-nm airglow2005

    • Author(s)
      Ogawa, T., Y.Otsuka, F.Onoma, K.Shiokawa, M.Yamamoto
    • Journal Title

      Ann.Geophys. Vol.23

      Pages: 2291-2399

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Disruption of E Region Echoes Observed by the EAR during the Development Phase of Equatorial Spread F : A Manifestation of Electrostatic Field Coupling2005

    • Author(s)
      Patra, A.K., T.Yokoyama, M.Yamamoto, S.Saito, T.Maruyama, S.Fukao
    • Journal Title

      Geophys.Res.Lett. Vol.32, Art.No.L17104

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Geomagnetic conjugate observation of nighttime medium- and large-scale traveling ionospheric disturbances : FRONT3 campaign2005

    • Author(s)
      Shiokawa, K., Y.Otsuka, T.Ogawa, M.Yamamoto他7名
    • Journal Title

      J.Geophys.Res. (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Relationship of the onset of equatorial F region irregularities with the sunset terminator observed with the Equatorial Atmosphere Radar2004

    • Author(s)
      Yokoyama, T., S.Fukao, M.Yamamoto
    • Journal Title

      Geophys. Res. Lett. 31巻

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Three-dimensional simulation on generation of polarization electric field in the midlatitude E-region ionosphere2004

    • Author(s)
      Yokoyama, T., M.Yamamoto, S.Fukao, R.B.Cosgrove
    • Journal Title

      J. Geophys. Res. 109巻

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Geomagnetic conjugate observations of medium-scale traveling ionospheric disturbances at midlatitude using all-sky airglow imagers2004

    • Author(s)
      Otsuka, Y., K.Shiokawa, T.Ogawa, P.Wilkinson
    • Journal Title

      Geophys. Res. Lett. 31巻

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Relationship of the onset, of equatorial F region irregularities with the sunset terminator observed with the Equatorial Atmosphere Radar2004

    • Author(s)
      Yokoyama, T., S.Fukao, M.Yamamoto
    • Journal Title

      Geophys.Res.Lett. Vol.31, Art.No.L24804

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Three-dimensional simulation on generation of polarization electric field in the midlatitude E-region ionosphere2004

    • Author(s)
      Yokoyama, T., M.Yamamoto, S.Fukao, R.B.Cosgrove
    • Journal Title

      J.Geophys.Res. Vol.109, Art.No.A01309

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Geomagnetic conjugate observations of medium-scale traveling ionospheric disturbances at midlatitude using all-sky airglow imagers2004

    • Author(s)
      Otsuka, Y., K.Shiokawa, T.Ogawa, P.Wilkinson
    • Journal Title

      Geophys.Res.Lett. Vol.31, Art.No.L15803

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Relationship of the onset of equatorial F region irregularities with the sunset terminator observed with the Equatorial Atmosphere Radar2004

    • Author(s)
      Yokoyama, T., S.Fukao, M.Yamamoto
    • Journal Title

      Geophys.Res.Lett. 31・24

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Three-dimensional simulation on generation of polarization electric field in the midlatitude E-region ionosphere2004

    • Author(s)
      Yokoyama, T., M.Yamamoto, S.Fukao, R.B.Cosgrove
    • Journal Title

      J.Geophys.Res. 109巻

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Coupling of the Perkins instability and the sporadic E layer instability derived from physical arguments2004

    • Author(s)
      Cosgrove, R.B., R.T.Tsunoda, S.Fukao, M.Yamamoto
    • Journal Title

      J.Geophys.Res. 109巻

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Variance of wind estimates using spaced antenna techniques with the MU radar2004

    • Author(s)
      G.Hassenpflug, M.Yamamoto, S.Fukao
    • Journal Title

      Ann.Geophys. 22・11

      Pages: 3863-3868

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Spatial relationship of equatorial plasma bubbles and field-aligned irregularities observed with an all-sky airglow imager and the Equatorial Atmosphere Radar2004

    • Author(s)
      Otsuka, Y., K.Shiokawa, T.Ogawa, M.Yamamoto他2名
    • Journal Title

      Geophys.Res.Lett. 31巻

    • Related Report
      2004 Annual Research Report
  • [Publications] Fukao, S., M.Yamamoto, 他3名: "First Observations of Spatial Structure of 3-m-Scale Field-Alignered Irregularities with the Equatorial Atmosphere Radar in Indonesia"Journal of Geophysical Research. 109・A02. A02304 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Yokoyama, M.Yamamoto, S.Fukao: "Three-dimensional simulation on generation of polarization electric field in the midlatitude E-region ionosphere"Journal of Geophysical Research. 109・A1. A01309 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Yokoyama, M.Yamamoto, S.Fukao: "Computer simulation of polarization electric fields as a source of midlatitude field-aligned irregularities"Journal of Geophysical Research. 108・A2. 1054 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Otsuka, T.Ogawa, 他5名: "Optical and Radio Measurements of a 630-nm Enhancement over Japan on September 9, 1999"Journal of Geophysical Research. 108・A6. 1252 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Fukao, Y.Ozawa, M.Yamamoto, 他1名: "Altitude-Extended Equatorial Spread F Observed near Sunrise Terminate over Indonesia"Geophysical Research Letter. 30・22. 2137 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Fukao, H.Hashiguchi, 他7名: "The Equatorial Atmosphere Radar (EAR) : System description and first results"Radio Science. 38・4. 1053 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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