Heliospheric plasma sheet (HPS) impingement onto the magnetosphere as a cause of relativistic electron dropouts (REDs) via coherent EMIC wave scattering with possible consequences for climate change mechanisms

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  • B. T. Tsurutani
    Jet Propulsion Laboratory California Institute of Technology Pasadena California USA
  • R. Hajra
    Instituto Nacional de Pesquisas Espacias Sao Jose dos Campos Brazil
  • T. Tanimori
    Faculty of Science Kyoto University Kyoto Japan
  • A. Takada
    Faculty of Science Kyoto University Kyoto Japan
  • B. Remya
    Academia Sinica Taipei Taiwan
  • A. J. Mannucci
    Jet Propulsion Laboratory California Institute of Technology Pasadena California USA
  • G. S. Lakhina
    Indian Institute of Geomagnetism Navi Mumbai India
  • J. U. Kozyra
    Department of Space Physics University of Michigan Ann Arbor Michigan USA
  • K. Shiokawa
    Institute for Space Earth Environmental Research Nagoya University Nagoya Japan
  • L. C. Lee
    Academia Sinica Taipei Taiwan
  • E. Echer
    Instituto Nacional de Pesquisas Espacias Sao Jose dos Campos Brazil
  • R. V. Reddy
    Academia Sinica Taipei Taiwan
  • W. D. Gonzalez
    Instituto Nacional de Pesquisas Espacias Sao Jose dos Campos Brazil

書誌事項

公開日
2016-10
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016ja022499
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>A new scenario is presented for the cause of magnetospheric relativistic electron decreases (REDs) and potential effects in the atmosphere and on climate. High‐density solar wind heliospheric plasmasheet (HPS) events impinge onto the magnetosphere, compressing it along with remnant noon‐sector outer‐zone magnetospheric ~10‐100 keV protons. The betatron accelerated protons generate coherent electromagnetic ion cyclotron (EMIC) waves through a temperature anisotropy (T<jats:sub>⊥</jats:sub>/T<jats:sub>||</jats:sub> > 1) instability. The waves in turn interact with relativistic electrons and cause the rapid loss of these particles to a small region of the atmosphere. A peak total energy deposition of ~3 × 10<jats:sup>20</jats:sup> ergs is derived for the precipitating electrons. Maximum energy deposition and creation of electron‐ion pairs at 30‐50 km and at < 30 km altitude are quantified. We focus the readers' attention on the relevance of this present work to two climate change mechanisms. Wilcox et al. (1973) noted a correlation between solar wind heliospheric current sheet (HCS) crossings and high atmospheric vorticity centers at 300 mb altitude. Tinsley et al. () has constructed a global circuit model which depends on particle precipitation into the atmosphere. Other possible scenarios potentially affecting weather/climate change are also discussed.</jats:p>

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