Spread-F/sporadic E coupling at Chung-Li, especially for postsunset periods of sunspot maximum years

Details Spread-F/sporadic E coupling at Chung-Li, especially for postsunset periods of sunspot maximum years Spread-F/sporadic E coupling at Chung-Li, especially for postsunset periods of sunspot maximum years

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1148b&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A4, pp. SIA 4-1, CiteID 1148, DOI 10.1029/2002JA009541

Physics

Space Physics

1

Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Disturbances, Ionosphere: Ionospheric Irregularities, Ionosphere: Wave Propagation (6934)

Scientific paper

Using ionogram-recorded data, the coupling between spread-F occurrence and enhanced Es blanketing frequencies (fbEs) (indicative of foEs changes), has been investigated for an equatorial-ionospheric-anomaly crest station, Chung-Li, for the postsunset periods of sunspot-maximum years. Apart from the evidence for coupling from inspections of the f-plots alone, for the years analyzed (1981, 1982, 1988, and 1989), statistical results of more significance were found from superposed-epoch analyses. Isolated spread-F events of duration of 2 hours or less which started at or before 2200 LT were used as controls on time series. These series were made up of comparisons between 15-min f-plot fbEs values and interpolated monthly median fbEs values. Evidence for coupling was found for the analyses which involved 97 controls. The evidence in the f-plots for three events involving Es patches, which investigators have examined in some detail using the VHF radar at Chung-Li, suggests that these events are also coupled to isolated spread-F occurrence.

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