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1993 Fiscal Year Final Research Report Summary

Modeling of Ionospheric processes

Research Project

Project/Area Number 04640426
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Space and upper atmospheric physics
Research InstitutionNAGOYA UNIVERSITY

Principal Investigator

KAMIDE Yohsuke  Nagoya University, Solar-Terrestrial Environment Laboratory Professor, 太陽地球環境研究所, 教授 (60113099)

Project Period (FY) 1992 – 1993
KeywordsIonoshere-magnetoshere Coupling / Substorm / Inversion Technique / Auroral electrojet / Plasma convection
Research Abstract

This is one of a series of the basic research projects which aim at better understanding and estimating plasma convection in the magnetosphere on the basis of information primarily of ground-based magnetometer data. Starting with improving the so-called magnetogram-inversion technique combined effectively with observations of the high-latitude ionosphere by means of coherent and incoherent scatter radars and polar-orbiting satellites, it has been attempted (1) to separate large-scale convection electric fields from substorm-associated, localized electric fields, (2) to obtain the local time dependence of the auroral electrojets, and (3) to prove (or disprove) that the auroral electrojets during substorm expansion consists of two elements representing two solar wind-magnetosphere coupling processes ; i.e., the directly driven process and the loading-unloading process.
The following are the main findings :
1. Examining data of the ionospheric conductivity and the electric field from detailed observation by EISCAT, it is found that there is a significant degree of the height dependence in ionospheric currents, and that near 120 km, the pedersen currents have north-south components as well.
2. The deformation of the global potential destribution during substorms is chracterized by summation of two potential systems, which are the so-called twin vortex pattern centered at dawn and dusk sectors and the substorm-expansion potential distribution centered in the midnight sector.

  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Y.Kamide: "Is substorm occurrence a necessary condition for a storm?" J.Geomag.Geoelectr.44. 109-117 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kamide: "Altitude variations of ionospheric currents at auroral latitudes" Geophys.Res.Lett.20. 309-312 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kamide: "A question of substorm size-what controls the dynamic range of the substorm intensity?" J.Geomag.Geoelectr.45. 443-448 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kamide: "A unified view on convection and field-aligned current patterns in the polar cap" J.Atmos.Terr.Phys.56. 245-263 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kamide: "Auroral electrojet activity during isolated substorms at different local times:A statistical study" Geophys.Res.Lett.21(in press). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kamide: "On prediction and physical interpretation of auroral electrojet activity" Adv.Space Phys.13(in press). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kamide, Y.: "Is substorm occurrence a necessary condition for a magnetic storm?" J.Geomag.Geoelectr.44. 109-117 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ahn, B.-H., Y.Kamide, H.W.Kroehl, and D.J.Gorncy: "Cross-polar cap potential difference, auroral clcctrojet indices, and solar wind parameters" J.Geonphys. Res.97. 1345-1352 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamide, Y.: "Intro-ducion to "The key questions on magnetospheric physics and substorms" J.Atmos.Terr.Phys.55. 1089-1090 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamide, Y.and A.Brekke: "Altitude variations of ionospneric currents at auroral latitudes, Geophys.Res.Lett." 20. 309-312 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamide, Y.: "A question of substorm size-What controls the dynamic range of the substorm intensity?" J.Geomag.Geoelectr.45. 443-448 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sun, W., Y.Kamide, J.R.Kan, and S.-I.Akasofu: "Inversion of the auroral electrojets from magnetometer chain data based on the flexible tolerance method" J.Geomag.Geoelectr.45. 1151-1157 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamide, Y., and O.A.Troshichev: "A unified view on convection and field-algned current patterns in the polar cap" J.Atmos.Terr.Phys.56. 245-263 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamide, Y., and H.W.Kroehl: "Auroral electrojet activity during isolated substorms at different local times : A statistical study" Geophys.Res.Lett.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Gonzalez, W., J.A.Joselyn, Y.Kamide, H.W.Kroehl, G.Rostoker, B.T.T surutani, and V.Vasyliunas: "What is a magnetic storm?" J.Geophys.Res.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakai, H., and Y.Kamide: "A model of the large-scale distribution of the neutral sheet current and its substorm-associated changes" J.Geophys.Res.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fukushima, N., and Y.Kamide: "Geomagnetic substorms with different D/H ratio associated with low-latitude aurora on October 21, 1989" J.Geomag.Geoelectr.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sato, M., Y.Kamide, A.Brekke, and S.Nozawa: "The altitude profile of ionospheric currents and conductivities deduced from EISCAT observations" Bull.Polar Res.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamide, Y.: "On prediction and physical interpretation of auroral electrojet activity" Ady.Space Phys.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamide, Y.: "Ionospheric currents and magnetic desturbances at low latitudes during substorms" in COSPAR Colloquiun-Volume 7, Pergamon Press. (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakai, H., and Y.Kamide: "On the average position of the near-earth neutral sheet" J.Geomag.Geoelectr.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Brekke, A.and Y.Kamide: "On the relationship between Joule heating in the auroral ionosophere" J.Atmos.Ter.Phys. (submitted for publication).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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