Statistics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.6271s&link_type=abstract
Journal of Geophysical Research, vol. 87, Aug. 1, 1982, p. 6271-6280.
Statistics
7
Auroral Zones, E Region, Ion Scattering, Ionospheric Electron Density, Magnetohydrodynamic Stability, Riometers, Atmospheric Ionization, Diurnal Variations, Extraterrestrial Radio Waves, Magnetic Fields, Universal Time
Scientific paper
The suggestion by D'Angelo (1976) that E region field-aligned ionsopheric irregularities might be detectable by an auroral zone riometer is examined. Results of a study of rapid ( not greater than 60-s period) variations of the Siple Station, Antarctica 30-MHz riometer signal are that the occurrence statistics of these variations are under control of universal time rather than sidereal time; there is a night-day asymmetry and a quiet time afternoon secondary maximum in occurrence rate, and there is no significant difference in the occurrence rates of small variations initially deflecting above or below the background level of quasi-steady signal. These conclusions are not in conflict with absorption, but cannot be explained by scattering from field-aligned irregularities. A maximum of 30% of all rapid variations can be accounted for by the scattering interpretation, and the study results are consistent with a zero rate (null hypothesis).
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