Other
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..897y&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Feb. 1, 1988, p. 897-911.
Other
22
Auroras, Luminosity, Periodic Variations, Plasma Oscillations, Space Plasmas, All Sky Photography, Relaxation Oscillators, Statistical Analysis, Television Systems, Time Response
Scientific paper
All-sky TV records are used to show that the luminosity fluctuations of pulsating auroras can be understood in terms of a series of pulses with rapid on-off switchings in burstlike fashion and that the widths of successive pulses are fairly constant. Complex-irregular variations are found to be due to simultaneous appearance of more pulsating patches that exhibit movements eastward and westward over the site, and each of the patches shows primarily isolated luminosity pulses. The pulsation 'on' time is found to statistically concentrate in two small ranges, 0.2-0.5 s for flash including 3 Hz modulation and 2-6 s for pure-expansion and streaming-propagating modes. The pulsation 'off' time, on the other hand, is widely scattered over a range from nearly zero to more than one minute.
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