Characteristics of Magnetosheath Plasma Observed at Low Altitudes in the Dayside Magnetospheric Cusps

  • J. David Winningham
Part of the Astrophysics and Space Science Library book series (ASSL, volume 32)


Magnetosheath plasma penetrating to low altitudes in the dayside cusp region of the magnetosphere has been observed by the ISIS 1 soft particle spectrometer (SPS). The extent of these particle fluxes in MLT and IN Lat, their variation with magnetic activity, and their pitch angle distribution are given. Comparison between the SPS data and energetic particle data indicates that the boundary between open and closed field lines on the dayside is associated with a sharp drop in the outer zone á 1 keV electron fluxes. It is shown that these newly identified cusp fluxes provide the necessary energy to produce observed dayside auroral oval phenomena.


Solar Wind Pitch Angle Electron Flux Outer Zone Proton Flux 
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Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1972

Authors and Affiliations

  • J. David Winningham
    • 1
  1. 1.Atmospheric and Space Sciences DivisionThe University of TexasDallasUSA

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