E- and F-region variations near periods of 27 and 15 days at Washington, D.C.

Details E- and F-region variations near periods of 27 and 15 days at Washington, D.C. E- and F-region variations near periods of 27 and 15 days at Washington, D.C.

May 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965jatp...27..605n&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 27, no. 5, pp. 605-616

Physics

Scientific paper

The E- and F-regions over Washington, D.C., were examined for periodic variations near the 27- and 15-day periods. A noontime centered seven-hour average of the minimum virtual height h'E and the ordinary wave critical frequencies [latin small letter f with hook]0E and [latin small letter f with hook]0F2 were examined over an eight-year period. These averages, h', and respectively, were subjected to power- and cross-spectrum analysis. Nonseasonal variations in h' are not correlated with or . and have a strong 27-day periodicity between the maximum and minimum Zurich sunspot number and are in phase at this period. and are related and in phase at the 14·7-day period but neither nor has a 14·7-day periodicity indicated in their power spectra. and are a maximum at the 14·7-day period just after lunar transit. The phase relations are compared with earlier results.

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