Physics
Scientific paper
Feb 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965jatp...27..145b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 27, no. 2, pp. 145-154
Physics
Scientific paper
A long term series of absorption observations on up to eight frequencies has been made at Breisach, near Freiburg. Apart from the usual studies a discrimination between deviative (E) and non-deviative (D) absorption has been made. In the investigation those cases where blanketing Es was present have been treated separately. The results for a period of four years have shown: 1. (1) The diurnal variation is mainly due to the non-deviative part; the parameters of the deviative absorption remain nearly constant during daylight hours. 2. (2) An asymmetry exists, evening values being considerably higher than the corresponding morning values. 3. (3) The average diurnal variation (after shifting for the asymmetry) gives different cos [chi]-laws in summer and winter; the exponent is about 0.8 in summer but only 0.45 in winter. 4. (4) The seasonal variation is largely influenced by systematic height variations of the E-layer. 5. (5) The sunspot cycle variation has shown a positive correlation for both absorption influences. A "saturation" occurs when the average sunspot number number reaches 160.
Bibl K.
Paul Abhijeet
Rawer Karl
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