You're viewing this item in the new Europeana website. View this item in the original Europeana.

Daily relative sunspot numbers 1818-1848: reconstruction of missing observations

The missing daily relative sunspot numbers in the time interval 1818-1848 were reconstructed by the nonlinear two-step method of interpolation. In the first step directly interpolated gaps were not longer than five days. In the second step, the data were sorted in the so called Bartels scheme, i.e. in rows of the length of 27 days
subsequently ranged in a matrix. The missing data of longer gaps we…