Physics
Scientific paper
Apr 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968jatp...30..579w&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 30, no. 4, pp. 579-589
Physics
3
Scientific paper
A statistical [`]semi-annual' variation of the amplitudes of the Sa-variation has been deduced from the records of the Potsdam-Seddin-Niemegk observatory (52°N) for the period 1912-1961, with secondary maxima in April and September/October and a clearly pronounced secondary minimum in May. Two different methods have been used to investigate this variation. The most important results are: 1. With increasing sunspot number the amplitude of the [`]semi-annual'-variation increases and the secondary maximum in September/October assumes a more distinct form even for an extensively selected material of extremely quiet days. (This maximum is only weakly indicated during periods with low sunspot numbers.)2. Statistical investigations reveal that the [`]semi-annual' variation shows a persistent periodicity. The amplitude of this variation has a strong correlation with the sunspot number. Some first attempts have been made to explain this [`]semi-annual' variation on the basis of the model of the atmospheric symmetric dynamo only as well as by taking into consideration magneto-hydrodynamic causes in addition.
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