Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..496f&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, May 1984, p. 496-499.
Physics
79
Boundaries, Earth Magnetosphere, Electron Beams, Electron Energy, Shock Layers, Solar Wind, Velocity Distribution, International Sun Earth Explorer 1, Magnetic Fields, Magnetohydrodynamic Stability, Plasma Waves
Scientific paper
Reduced velocity distributions are derived from three-dimensional measurements of the velocity distribution of electrons in the 7 to 500 eV range in the electron foreshock. Bump-on-tail reduced distributions are presented for the first time at the foreshock boundary consistent with Filbert and Kellogg's proposed time-of-flight mechanism for generating the electron beams. In a significant number of boundary crossings, bump-on-tail reduced distributions were found in consecutive 3 sec measurements made 9 sec apart. It is concluded that, although the beams are linearly unstable to plasma waves according to the Penrose criterion, they persist on a time scale of 3 to 15 sec. Previously announced in STAR as N84-22518
Fitzenreiter Richard J.
Klimas Alex J.
Scudder Jack D.
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