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A method for predicting the F 1 layer critical frequency based on the Zurich smoothed sunspot number
Author(s) -
DuCharme E. D.,
Petrie L. E.,
Eyfrig R.
Publication year - 1973
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs008i010p00837
Subject(s) - sunspot , sunspot number , critical frequency , series (stratigraphy) , ionosphere , mathematics , physics , meteorology , statistics , solar cycle , geology , solar wind , geophysics , plasma , paleontology , quantum mechanics , magnetic field
A series of expressions to calculate the monthly median F 1 layer penetration frequency ( ƒoF 1 ) as a function of the ionospheric index IF 2 was reported by DuCharme et al. , [1971]. Using similar techniques and the same data base, development of a series of expressions to calculate ƒoF 1 as a function of the Zurich smoothed sunspot number R 12 is described. The derived expressions are evaluated for the period of maximum solar activity 1967 through 1969 and compared with observed ƒoF 1 data for this period, which are outside the 1954 through 1966 data base used to develop the expressions.