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Time sequence analysis of flickering auroras. I - Application of Fourier analysisUsing 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.
Document ID
19810032958
Document Type
Reprint (Version printed in journal)
Authors
Berkey, F. T. (Utah State University of Agriculture and Applied Science, Logan, Utah, United States)
Silevitch, M. B. (California University La Jolla, Calif.; Northeastern University, Boston, Mass., United States)
Parsons, N. R. (North Brisbane College of Advanced Education Kedron, Queensland, Australia)
Date Acquired
August 11, 2013
Publication Date
December 1, 1980
Publication Information
Publication: Journal of Geophysical Research
Volume: 85
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NRC A-3131
CONTRACT_GRANT: NSF ATM-79-11875
CONTRACT_GRANT: AF-AFOSR-78-3731
CONTRACT_GRANT: NGL-05-005-007
Distribution Limits
Public
Copyright
Other