Mathematics – Logic
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.4720r&link_type=abstract
Journal of Geophysical Research, vol. 82, Oct. 1, 1977, p. 4720-4740.
Mathematics
Logic
24
All Sky Photography, Auroral Arcs, Auroras, Geomorphology, Polar Substorms, Satellite Observation, Data Acquisition, Defense Program, Electric Pulses, Meteorological Satellites, Television Cameras
Scientific paper
Extensive observations with all-sky TV cameras supplemented by observations with narrow-field TV cameras, conventional all-sky cameras and images from DMSP satellites have shown that pulsating auroras are broadly distributed along the auroral oval throughout much of the auroral substorm. Intensity variations in pulsating auroras may be repetitive, quasi-periodic or occasionally periodic with a time scale ranging from less than 1 sec to several tens of seconds. Pulsations occur in auroral arcs, arc segments and patches of fixed and variable area. The temporal and spatial characteristics are highly variable over a broad and continuous spectrum; rapid changes from one set of characteristics to another frequently occur, as do reversible changes from pulsating to nonpulsating auroras.
Davis Neil T.
Royrvik O.
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