Physics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.6827b&link_type=abstract
Journal of Geophysical Research, vol. 85, Dec. 1, 1980, p. 6827-6843. Research supported by the University of Texas; Nation Res
Physics
8
Auroras, Fourier Analysis, Signal Analysis, Time Series Analysis, Flicker, Frequency Response, Power Spectra, Radio Attenuation, Riometers
Scientific paper
Using a technique that enables one to digitize the brightness of auroral displays from individual fields of a video signal, we have analyzed the frequency content of flickering aurora. Through the application of Fourier analysis to our data, we have found that flickering aurora contains a wide range of enhanced frequencies, although the dominant frequency enhancement generally occurs in the range 6-12 Hz. Each incidence of flickering that we observed was associated with increased radio wave absorption. Furthermore, we have found that flickering occurs in bright auroral surges, the occurrence of which is not limited to the 'breakup' phase of auroral substorms. Our results are interpreted in terms of a recently proposed theory of fluctuating double layers that accounts for a number of the observational features.
Berkey Tom F.
Parsons N. R.
Silevitch Michael B.
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