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Generation of EMIC Waves in the Magnetosphere and Precipitation of Energetic Protons: Comparison of the Data from THEMIS High Earth Orbiting Satellites and POES Low Earth Orbiting Satellites

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Abstract

Regions of the detection of electromagnetic ion-cyclotron (EMIC) waves on the THEMIS satellites near the equatorial plane and the precipitation of energetic protons on POES low Earth orbiting satellites are compared with the magnetospheric magnetic field model. It is confirmed that low Earth orbiting satellites detect the precipitation of energetic protons in the regon associated with observations of EMIC waves in the magnetosphere. This is consistent with the idea that protons are scattered in the loss cone as a result of ioncyclotron interaction. Thus, observations of fluxes of energetic protons in low Earth orbits can be used to monitor ion-cyclotron instability regions in the magnetosphere. Simultaneous observations at high and low Earth orbits contribute to the construction of a spatiotemporal pattern of the interaction region of EMIC waves and energetic protons. In addition, it is shown that proton precipitation associated with EMIC waves can cause errors in determining the latitude of the isotropic boundary (the equatorial boundary of isotropic fluxes of energetic protons), which is an indicator of the configuration of the magnetic field in the magnetosphere.

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Authors and Affiliations

  1. Polar Geophysical Institute, Apatity, Russia

    T. A. Popova, A. G. Yahnin & A. G. Demekhov

  2. Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia

    A. G. Demekhov

  3. St. Petersburg State University, St. Petersburg, Russia

    S. A. Chernyaeva

Authors
  1. T. A. Popova
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  2. A. G. Yahnin
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  3. A. G. Demekhov
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  4. S. A. Chernyaeva
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Correspondence to T. A. Popova.

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Original Russian Text © T.A. Popova, A.G. Yahnin, A.G. Demekhov, S.A. Chernyaeva, 2018, published in Geomagnetizm i Aeronomiya, 2018, Vol. 58, No. 4, pp. 484–497.

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Popova, T.A., Yahnin, A.G., Demekhov, A.G. et al. Generation of EMIC Waves in the Magnetosphere and Precipitation of Energetic Protons: Comparison of the Data from THEMIS High Earth Orbiting Satellites and POES Low Earth Orbiting Satellites. Geomagn. Aeron. 58, 469–482 (2018). https://doi.org/10.1134/S0016793218040114

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