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Rocket measurements of electrons in a system of multiple auroral arcsA Nike-Tomahawk rocket was launched into a system of auroral arcs northward of Poker Flat Research Range, Fairbanks, Alaska. The pitch-angle distribution of electrons was measured at 2.5, 5, and 10 keV and also at 10 keV on a separating forward section of the payload. The auroral activity appeared to be the extension of substorm activity centered to the east. The rocket crossed a westward-propagating fold in the brightest band. The electron spectrum was relatively hard through most of the flight, showing a peak in the range from 2.5 to 10 keV in the weaker aurora and below 5 keV in the brightest arc. The detailed structure of the pitch-angle distribution suggested that, at times, a very selective process was accelerating some electrons in the magnetic field direction, so that a narrow field-aligned component appeared superimposed on a more isotropic distribution. It is concluded that this process could not be a near-ionosphere field-aligned potential drop, although the more isotropic component may have been produced by a parallel electric field extending several thousand kilometers along the field line above the ionosphere.
Document ID
19770044475
Document Type
Reprint (Version printed in journal)
Authors
Boyd, J. S. (Alaska Univ. Fairbanks, AK, United States)
Davis, T. N. (Alaska, University Fairbanks, Alaska, United States)
Date Acquired
August 8, 2013
Publication Date
March 1, 1977
Publication Information
Publication: Journal of Geophysical Research
Volume: 82
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NGR-02-001-087
CONTRACT_GRANT: NGL-44-006-012
CONTRACT_GRANT: NAS6-1667
Distribution Limits
Public
Copyright
Other