Rocket measurements of electrons in a system of multiple auroral arcs

Details Rocket measurements of electrons in a system of multiple auroral arcs Rocket measurements of electrons in a system of multiple auroral arcs

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1197b&link_type=abstract

Journal of Geophysical Research, vol. 82, Mar. 1, 1977, p. 1197-1205.

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Auroral Arcs, Electron Distribution, Polar Substorms, Rocket Sounding, Angular Distribution, Electron Energy, Magnetic Signatures, Nike-Tomahawk Rocket Vehicle, Particle Acceleration, Pitch (Inclination)

Scientific paper

A 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.

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