Upper hybrid and Langmuir turbulence in the auroral E region

Details Upper hybrid and Langmuir turbulence in the auroral E region Upper hybrid and Langmuir turbulence in the auroral E region

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.1993k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, March 1, 1988, p. 1993-1996.

Physics

17

Auroral Ionization, E Region, Plasma Turbulence, Auroral Zones, Ionospheric Disturbances, Plasma Oscillations

Scientific paper

Oscillations at a frequency between the local upper hybrid and plasma frequencies have been detected in the upper E region of the morning auroral oval. The emission occurs in a narrow band of frequencies when the dipole antenna is nearly perpendicular to B but broadens when the antenna has a component parallel to B. The waves have a low-altitude cutoff at about 125-130 km, and their intensity increases in regions of low plasma density. No theoretical explanation yet exists for these waves, which may be the manifestation of a plasma instability process due to the suprathermal electron flux which accompanies collisional ionization in the auroral E region.

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