Poynting vectors of Pc 5 pulsations observed by thc GEOTAIL satellite in the dayside outer magnetosphere

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  • Sakurai Tohru
    Department of Aeronautics and Astronautics, School of Engineering, Tokai University
  • Tonegawa Yutaka
    Department of Aeronautics and Astronautics, School of Engineering, Tokai University
  • Shinkai Yuichi
    Department of Aeronautics and Astronautics, School of Engineering, Tokai University
  • Yumoto Kiyohumi
    Department of Earth and Planetary Sciences, Kyushu University
  • Kokubun Susumu
    Solar-Terrestrial Environmental Laboratory, Nagoya University
  • Tsuruda Koichiro
    The Institute of Space and Aeronautical Science
  • Mukai Toshifumi
    The Institute of Space and Aeronautical Science

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  • Poynting vectors of Pc 5 pulsations observed by the GEOTAIL satellite in the dayside outer magnetosphere

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Poynting vectors of Pc 5 pulsations observed in the dayside outer magnetosphere are examined with the magnetic and electric field data simultaneously observed by the GEOTAIL satellite. Poynting energy can be estimated as about 10-8-10-6 W/m2 in both directions across and along the magnetic field-line. However, the energy propagating across the magnetic field-line is larger than the energy propagating along the magnetic field-line. From this result we can estimate the Pc 5 wave energy flowing into the inner magnetosphere during an hour as 1010-1013 J, which is one or two orders less than the substorm energy (about 1014-1015 J). However, by taking into account of the continuous activation of Pc 5 pulsations in the outer magnetosphere, Pc 5 waves should play an important role for energetics in the magnetosphere.

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