Physics
Scientific paper
Jul 1936
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1936phrv...50...45y&link_type=abstract
Physical Review, vol. 50, Issue 1, pp. 45-47
Physics
2
Scientific paper
The observed optimum frequency f for long distance daylight communication averaged over the year during the period from 1923 to 1936 was found to vary with the yearly average relative sunspot number s according to the relation f=7.8(s+12)14. The march of the sunspot curve from 1749 to 1935 suggests the possibility of greater sunspot numbers in coming solar cycles than the value s=78 which occurred at the 1928 maximum. By means of the f, s relation, radio conditions for sunspot numbers from 100 to 160 are calculated.
Hulburt E. O.
Young L. C.
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