Accession Number : ADA140175
Title : A Laboratory Investigation of the High-Frequency Farley-Buneman Instability.
Descriptive Note : Progress rept.,
Corporate Author : IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
Personal Author(s) : Kustom,B ; D'Angelo,N ; Merlino,R L
PDF Url : ADA140175
Report Date : Apr 1984
Pagination or Media Count : 32
Abstract : A laboratory investigation of the high-frequency Farley-Buneman instability is described. The instability was studied theoretically and is predicted to occur in the low E region of the ionosphere when the E/B drift velocity of the electrons relative to the ions is several times Cs, the ion-acoustic speed. In our experiments, an increase of the electric field well above the Lee 'threshold' merely enhances the general power level of the fluctuations but does not effect appreciably their spectral shape. The observed frequency spectra fall-off in all cases very rapidly with increasing frequency, with a spectral shape of the type P(f) alpha 1f to the 3.5 power. This result has negative implications for a recently proposed mechanism of anomalous wave electron heating in the lower E region of the ionosphere.
Descriptors : *E region, Ionospheric modification, Ionospheric propagation, Spectra, Electron density, Drift, Electric fields, High frequency
Subject Categories : Atmospheric Physics
Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE