Cluster observations of reflected EMIC‐triggered emission

DOI Web Site Web Site 被引用文献2件
  • B. Grison
    Department of Space Physics, Institute of Atmospheric Physics CAS Prague Czech Republic
  • F. Darrouzet
    Royal Belgian Institute for Space Aeronomy (BIRA‐IASB) Brussels Belgium
  • O. Santolík
    Department of Space Physics, Institute of Atmospheric Physics CAS Prague Czech Republic
  • N. Cornilleau‐Wehrlin
    Laboratoire de Physique des Plasmas CNRS/Ecole Polytechnique/Obs. de Paris/UPMC/Univ. Paris‐Sud Palaiseau France
  • A. Masson
    Science Operations Department, ESAC European Space Agency Madrid Spain

書誌事項

公開日
2016-05-14
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016gl069096
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>On 19 March 2001, the Cluster fleet recorded an electromagnetic rising tone on the nightside of the plasmasphere. The emission was found to propagate toward the Earth and toward the magnetic equator at a group velocity of about 200 km/s. The Poynting vector is mainly oblique to the background magnetic field and directed toward the Earth. The propagation angle <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/grl54384-math-0001.png" xlink:title="urn:x-wiley:grl:media:grl54384:grl54384-math-0001"/> becomes more oblique with increasing magnetic latitude. Inside each rising tone <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/grl54384-math-0002.png" xlink:title="urn:x-wiley:grl:media:grl54384:grl54384-math-0002"/> is more field aligned for higher frequencies. Comparing our results to previous ray tracing analysis we conclude that this emission is a triggered electromagnetic ion cyclotron (EMIC) wave generated at the nightside plasmapause. We detect the wave just after its reflection in the plasmasphere. The reflection makes the tone slope shallower. This process can contribute to the formation of pearl pulsations.</jats:p>

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