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Predominance of even Ap indices
Author(s) -
FraserSmith A. C.,
Bubenik D. M.
Publication year - 1976
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl003i002p00091
Subject(s) - rounding , earth's magnetic field , statistics , mathematics , econometrics , geology , geodesy , physics , computer science , quantum mechanics , magnetic field , operating system
A study of the frequency distribution of geomagnetic activity Ap indices shows that there is a tendency for more of the indices to be even than are odd. We identify the probable source of the bias, i.e., the use of a particular rounding rule in the derivation of the Ap values, and we suggest two methods for eliminating the tendency to even values.