Characteristics of Magnetosheath Plasma Observed at Low Altitudes in the Dayside Magnetospheric Cusps
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.
KeywordsSolar Wind Pitch Angle Electron Flux Outer Zone Proton Flux
Unable to display preview. Download preview PDF.
- Burrows, J. R.: 1971, private communication.Google Scholar
- Eather, R. H. and Mende, S. B.: 1971b, Paper presented at Advanced Study Institute on Magnetosphere-Ionosphere Interactions, Dalseter, Norway.Google Scholar
- Fairfield, D. H.: 1971, private communication.Google Scholar
- Frank, L. A.: 1970, U. of Iowa Report, 70-55.Google Scholar
- Gurnett, D.: 1972, this volume, p. 233.Google Scholar
- Winningham, J. D.: 1970, Dissertation, Texas A & M University.Google Scholar