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Detection of bump-on-tail reduced electron velocity distributions at the electron foreshock boundary (1984)

Fitzenreiter, R. J. ; Klimas, A. J. ; Scudder, J. D.

In: CASI

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Publication Date: 2019-06-28

Description: 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.

Keywords: ASTROPHYSICS

Type: NASA-TM-86067 , NAS 1.15:86067

Format: application/pdf

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