Other
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4...55b&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 4, Feb. 1986, p. 55-60.
Other
2
F 2 Region, Midlatitude Atmosphere, Sporadic E Layer, Traveling Ionospheric Disturbances, Australia, Daytime, Spread F, Statistical Correlation, Vertical Distribution
Scientific paper
Specific events illustrating an association between sporadic-E and travelling ionospheric disturbances (including spread-F disturbances) in midlatitude regions are presented and discussed. Also considered is the statistical significance of the association of sporadic-E occurrence with both spread-F and high-multiple occurrence. Superposed-epoch techniques are used. A high positive correlation is found between the occurrence of E(s) for a period of a day before to a day after particular dates when spread-F occurrence is high. For the high-multiple analyses, high correlations are also found extending over a similar period of several days. However, for high multiples the correlation with E(s) activity is negative. The results suggest that spread-F disturbances may be present during daylight hours with low amplitudes, possibly resulting from high upper-atmosphere neutral-particle densities. Also, there is evidence that sporadic-E occurrence at Brisbane, Australia is related to spread-F occurrence at other stations in the same longitude zone but located over a range of latitudes in both hemispheres. The blanketing effects of sporadic-E may explain the negative correlation of this parameter with high-multiple occurrence.
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