Physics
Scientific paper
Aug 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963jatp...25..415m&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 25, no. 8, pp. 415-427
Physics
2
Scientific paper
Percentage occurrence data of midday Es (percentage of times FEs > 5 Mc/s) for thirty-three stations in different regions of the globe were examined in relation to the solar activity for the period 1953-1959. The results obtained from statistical analysis can be summarised as follows: 1. (i) for twenty-three stations the percentage occurrences of Es were much greater in the sunspot maximum year than those of the minimum year and in general, those were positively correlated with sunspot activity, 2. (ii) for three stations the reverse was the case and the correlation between the two phenomena was found to be negative and 3. (iii) for the remaining seven stations percentage occurrences of Es did not show any marked preference to either the minimum or the maximum year of sunspot activity and in general, for these stations, the nature of the correlation was not clearly discernible. These stations were designated as A-, B-, and C-type stations respectively. It was also observed that three distinct Es zones; auroral, temperate and equatorial existed having the following characteristic features: 1. (a) Es occurrences in majority of the temperate zone stations, irrespective of any longitudinal zone and also those in most of the auroral stations in the east intermediate longitudinal zone show definite positive correlation with solar activity, 2. (b) for auroral stations in both the west and west intermediate longitudinal zone, the correlation is 2.1. (i) negative for stations in maximum auroral frequency belt and 2.2. (ii) either positive or not clearly discernible for stations outside this belt and 3. (c) for equatorial stations the correlation is negative. It was observed that in general a well defined parabolic relation existed between the two phenomena. The high sunspot activity of the present solar cycle seems to be responsible for this nonlinear relation as also for the well defined correlations observed for the majority of the stations.
Dasgupta M. K.
Mitra R. K.
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