The persistence and variability of anomalous E-region penetrating frequencies

Details The persistence and variability of anomalous E-region penetrating frequencies The persistence and variability of anomalous E-region penetrating frequencies

Sep 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965jatp...27.1009m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 27, no. 9, pp. 1009-1018

Physics

Scientific paper

Statistical analyses of the highest returned frequency from the E-region during daylight and night-time hours at Washington, D.C. are described. The results show an annual change in the character of the diurnal variation of this parameter. During the winter the daytime maximum occurs around noontime and then shifts to the mid-morning hours by the late summer months. Except for the annual variation, variance spectrum analyses show no significant tendency toward periodicities longer than two days in the noontime observations of f0Emax. However, the spectrum of the midnight observations shows, in addition to the annual period, evidence of a significant peak at six months, and another close to the lunar synodical period of approximately 29.5 days.

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