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