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

Title:

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

Creator:

Letfus, Vojtěch

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:a710b3e9-af1e-4300-a2a2-a8a571ecbcd6
uuid:a710b3e9-af1e-4300-a2a2-a8a571ecbcd6

Subject:

observations, sunspots, and method of interpolation

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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 were interpolated columnwise, i.e. the missing value at any position was interpolated from the data at the same positions of preceeding and following rows. The procedure enables to interpolate long gaps and simultaneously respect the 27-day data variation. The Appendix A contains annual tables of daily data, Appendix B gives monthly and annual means and Appendix C presents simutaneously annual plots of primary data and of those reconstructed by interpolation. The differences between the monthly and annual means of primary data and of data completed by interpolation are small and fluctuate around zero. Only in the time interval 1835-1842, when the frequency of observations was lowered, the amplitude of fluctuations is enhanced. The dispersion of monthly differences σ is ±4.3 R and of annual means ±1,1 R. The two-step method of interpolation was tested on the daily data series in the time interval 1918-1948. The sequence of missing daily data in the years 1818-1848 represents a masking function. The differences between the monthly and annual means of primary and modified data are small with fluctuations around zero and with dispersion σ for monthly differences ±2.7 R and for annual differences ±0.6 R. The small dispersion gives evidence about a high reliability of relative sunspot numbers derived from observations in the years 1818-1848 and also about the effectivity of the two-step method of interpolation. and Materiál obsahuje 3 (nestránkované) apendixy: - Appendix A Daily relative sunspot numbers 1818-1848 [s. 6-22] - Appendix B Monthly and annual means of relative sunsppot numbers 1818-1848 [s. 23-24] - Appendix C Plots of daily relative sunspot numbers 1818-1848 [s. 25-56]

Language:

Czech

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

1-5

Source:

Publications of the Astronomical Institute of the Academy of Sciences of the Czech Republic | 1996 Volume:84-85 | Number:85

Harvested from:

CDK

Metadata only:

false