On incoherent scatter plasma lines in aurorae

Details On incoherent scatter plasma lines in aurorae On incoherent scatter plasma lines in aurorae

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9911391m&link_type=abstract

Journal of Geophysical Research, Volume 99, Issue A6, p. 11391-11400

Physics

4

Ionosphere: Plasma Waves And Instabilities, Ionosphere: Auroral Ionosphere, Ionosphere: Particle Precipitation, Ionosphere: Plasma Temperature And Density

Scientific paper

We consider a new mechanism for the generation of short-scale, λ∥~10 cm, electron density fluctuations giving rise to plasma line enhancements measured by incoherent scatter radars in the auroral E region. It is explained as a coupling (conversion) of long-scale Langmuir waves generated by precipitated electron beams with short-scale ion-acoustic waves. The latter are supposed to be driven by field-aligned currents associated with the precipitation. This mechanism is most effective inside the thin layer of the enhanced plasma turbulence, named the plasma turbulence layer.

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