Pitch‐Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite

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  • M. Fukizawa
    Graduate School of Science Tohoku University Sendai Japan
  • T. Sakanoi
    Graduate School of Science Tohoku University Sendai Japan
  • Y. Miyoshi
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Y. Kazama
    Academia Sinica Institute of Astronomy and Astrophysics Taipei Taiwan
  • Y. Katoh
    Graduate School of Science Tohoku University Sendai Japan
  • Y. Kasahara
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • S. Matsuda
    Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
  • A. Matsuoka
    Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
  • S. Kurita
    Research Institute for Sustainable Humanosphere Kyoto University Uji Japan
  • M. Shoji
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • M. Teramoto
    Department of Space Systems Engineering, Faculty of Engineering Kyushu Institute of Technology Kitakyushu Japan
  • S. Imajo
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • I. Sinohara
    Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
  • S.‐Y. Wang
    Academia Sinica Institute of Astronomy and Astrophysics Taipei Taiwan
  • S. W.‐Y. Tam
    Institute of Space and Plasma Sciences National Cheng Kung University Tainan Taiwan
  • T.‐F. Chang
    Institute of Space and Plasma Sciences National Cheng Kung University Tainan Taiwan
  • B.‐J. Wang
    Academia Sinica Institute of Astronomy and Astrophysics Taipei Taiwan
  • C.‐W. Jun
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan

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<jats:title>Abstract</jats:title><jats:p>Electrostatic electron cyclotron harmonic (ECH) waves are generally excited in the magnetic equator region, in the sector from nightside to dayside during geomagnetically active conditions, and cause the pitch angle scattering by cyclotron resonance. The scattered electrons precipitate into the Earth's atmosphere and cause auroral emission. However, there is no observational evidence that ECH waves actually scatter electrons into the loss cone in the magnetosphere. In this study, from simultaneous wave and particle observation data obtained by the Arase satellite equipped with a high‐pitch angular resolution electron analyzer, we present evidence that the ECH wave intensity near the magnetic equator is correlated with an electron flux inside the loss cone with an energy of about 5 keV. The simulation suggests that this electron flux contributes to the auroral emission at 557.7 nm with an intensity of about 200 R.</jats:p>

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