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Published via the yankee Geophysical Union as a part of the Antarctic study Series.
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Extra info for Geomagnetism and Aeronomy: Studies in the Ionosphere, Geomagnetism and Atmospheric Radio Noise
Found by Duncan ;a UT variation of oppositephaseis found in the F• layer. Finally, the thickness of the F•. peak, which is related to the local temperature, does not show a UT variation but is larger in the summer (December) than in the winter. A parameter related to the maximum electron density in the F• layer also has a minimum in summer, indicating that the F• temperature is highest in summer. The presenceof ionization over the polar capsduring the long winter night is perhaps the most obvious evidence that conventional processesof electron production by sunlight, electron loss reactions, and diffusion are inadequate to explain the polar ionosphere.
20d. Byrd station, July (winter). Fig. 20. Scatter diagrams of foF,o. Hourly v•lues for selected stations •nd months (July, September, December). ) Copyright American Geophysical Union Geomagnetism and Aeronomy: Studies in the Ionosphere, Geomagnetism and Atmospheric Radio Noise Antarctic Research Series Vol. •: IONOSPHEmC CONDiTiONS 35 14 14 14 14 13 13 13 13 12 12 12 II II II 10 I0 I0 x 9 9 •" 9 • 8 8 :[ 8 --- ? -- ? u. ,, . ß . '. i•'. ß . "" ß ß - :,. • ' ß ß "' I ß ß ,e ß ß ß ß ß ß ß ß ß ß ' ß .
To understand the physical processesin this region better, the departures must be examined. Since the E and Ft critical frequenciesare thought to represent regionsof peaks of electron production as well as peaks of electron density, the critical frequencies (in contrast to foFa) constitute useful time difference between local zone time and universal measuresof the main controlling processesin their time. Table 2 gives the geographic coordinatesof respectiveregions. If the main processespredicted the four poleslocated on Antarctica, as well as the by the Chapmantheory are extractedfrom the data, universal time (UT) at local noon.