Anomalous auroral electron distributions due to an artificial ion beam in the ionosphere

Details Anomalous auroral electron distributions due to an artificial ion beam in the ionosphere Anomalous auroral electron distributions due to an artificial ion beam in the ionosphere

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7569m&link_type=abstract

Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7569-7579.

Physics

22

Auroral Electrojets, Beam Interactions, Ion Beams, Ionospheric Electron Density, Space Plasmas, Plasma Probes, Plasma Turbulence

Scientific paper

Results are reported for the perturbation of the auroral ionosphere by the operation of an ion gun which injected about 100 mA of 25-eV Ar(+) ions at upgoing pitch angles over a discrete auroral arc. The major effects observed were the excitation of intense broadband electric field fluctuations at zero-10 kHz, and the appearance of streaming and isotropic heating in different parts of superthermal electron velocity space. A scenario is explored in which electron runaway or streaming is expected between the trapping speed and the critical velocity for cyclotron interactions with the waves, where the streaming electrons carry the current that would be carried by thermals or energetic electrons in the absence of the waves. A current of about 1.0 microA/sq m is carried by the streaming electrons. The gun-associated electrons were anomalous in the sense that their anisotropy was the opposite of that observed in the natural aurora.

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