Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere

Details Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9213613n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 1, 1987, p. 13613-13627. Research supported by Naturvetenskaplig

Physics

23

Auroral Zones, E Region, Earth Ionosphere, High Frequencies, Polar Regions, Radar Measurement, Backscattering, Particle Precipitation, Scattering Cross Sections

Scientific paper

This paper discusses the results of the September 1983 observations of artificial field-aligned irregularities (AFAIs) in the Tromso, Norway region, made by backscatter radars operating at 46.9, 143.8, 21.4, and 140.0 MHz. Four classes of resonant instability processes at work in the E and F regions are examined in detail: (1) the coupling of parametric decay instability waves across geomagnetic field lines, (2) thermal parametric instability, (3) four-wave interaction thermal parametric instability, and (4) the resonance instability. The characteristics of the AFAI scatter are described, with special attention given to the growth and decay time constants, functional dependence on the heater power and polarization, and the scattering cross sections of the irregularities.

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