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Published September 1976 | Published
Journal Article Open

Energetic electron anisotropies in the magnetotail: Identification of open and closed field lines


Unidirectional anisotropies in the energetic electron fluxes (E ≳ 200 keV) have been observed in the earth's magnetotail with the Caltech Electron/Isotope Spectrometer on IMP-8. The anisotropies occur during periods of enhanced fluxes and provide essential information on the topology (open or closed) of the magnetotail field lines which are associated with recently identified acceleration regions.

Additional Information

© 1976 by the American Geophysical Union. Manuscript Accepted: 10 Aug 1976. Manuscript Received: 6 Apr 1976. We thank L. A. Frank both for providing us with an extensive body of IMP-8 LEPEDA energy-time spectograms prior to publication and for informative discussions. We are also grateful to R. P. Lepping and N. F. Ness for providing us with the IMP-8 magnetometer data through J. H. King of the National Space Science Data Center. We are grateful to R. E. Vogt who has been closely involved in this investigation and to W. E. Althouse, G.J. significant contributions to various phases of this program. This work was supported in part by the National Aeronautics and Space Administration under contract NAS5-11066 and Grant NGR 05-002-160.

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August 19, 2023
August 19, 2023