Computer Science – Sound
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7155w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Sept. 1, 1983, p. 7155-7169.
Computer Science
Sound
31
Auroras, Electron Precipitation, Energy Distribution, Flux Density, Spatial Distribution, Coordinates, E Region, Ionospheric Sounding, Normal Density Functions
Scientific paper
An array of ionospheric sounders spanning the continent of North America is used to make simultaneous measurements of the energy flux of the continuous aurora. The positions of these sounders are then transformed to a coordinate system in which the latitudes are demonstrated to be isoenergy flux contours. The instantaneous latitudinal distribution of energy flux is determined, and its time history is recorded continuously at 15-min intervals for a period of 8 hours. The internal consistency of the measurements as a whole is demonstrated, and it is shown that the distributions derived are in agreement with coinciding optical and particle measurements by satellites. Examples of agreement with previous studies are cited. Two latitudinal distributions are discerned. The principal one is a Gaussian distribution; the other, which is of lower intensity, occurs at higher latitude. The two are found to correspond respectively to the central plasma sheet and boundary plasma sheet regions of particle precipitation. Another finding is that the central plasma sheet distribution in all 32 determinations is well described by a single Gaussian function, 3.2 deg full width at half maximum.
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