Direct measurements of the Poynting flux associated with convection electric fields in the magnetosphere

DOI Web Site Web Site 被引用文献7件 参考文献38件
  • Y. Nishimura
    Department of Geophysics Tohoku University Sendai Japan
  • T. Kikuchi
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya Japan
  • A. Shinbori
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya Japan
  • J. Wygant
    School of Physics and Astronomy University of Minnesota Minneapolis Minnesota USA
  • Y. Tsuji
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya Japan
  • T. Hori
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya Japan
  • T. Ono
    Department of Geophysics Tohoku University Sendai Japan
  • S. Fujita
    Meteorological College Japan Meteorological Agency Kashiwa Japan
  • T. Tanaka
    Department of Earth and Planetary Sciences Kyushu University Fukuoka City Japan

書誌事項

公開日
2010-12
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2010ja015491
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Observations of Poynting fluxes associated with onset of convection electric fields are essential for understanding of electromagnetic energy transport from the solar wind toward the magnetosphere leading to changes in the convection electric field, which is one of the most fundamental parameters in the magnetosphere‐ionosphere coupled system. We present Cluster multispacecraft observations of Poynting fluxes associated with abrupt changes in large‐scale electric fields during sudden commencements and southward turning of the interplanetary magnetic field (IMF). The Cluster spacecraft detected Poynting fluxes dominated by the field‐aligned upward component during the preliminary impulse of sudden commencements and in the initial period after southward turning of the IMF. The upward Poynting flux indicates existence of Alfvén waves transporting electromagnetic energy from the ionosphere toward the magnetosphere leading to magnetospheric convection changes. The waveguide model and global magnetohydrodynamic (MHD) simulation calculating evolution of the Poynting flux following solar wind pressure enhancements also show upward Poynting fluxes propagating from the ionosphere toward the magnetosphere faster than the propagation of compressional waves. We conclude that the ionosphere acts as a channel to transmit electromagnetic energy supplied as field‐aligned currents toward a wide region in the magnetosphere‐ionosphere system instantaneously, leading to changes in magnetospheric convection electric fields.</jats:p>

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