|Series||Conventional time interval||ESAI time interval|
|monthly sunspot areas (Greenwich general system)||1874-1976||1821-1989|
|yearly sunspot areas (Greenwich general system) for N- and S- hemispheres||1874-1976||1821-1994|
|yearly mean latitudes of sunspots for N- and S- hemispheres||1874-1976||1854-1985|
|yearly polar faculae numbers (Mt.Wilson general system) for N- and S- hemispheres||1906-1991||1837-1999|
|yearly Wolf numbers (International general system)||1700-2002||1090-2002|
|yearly polar faculae numbers (Mt.Wilson general system)||1906-1991||1705-1999|
ESAI monthly sunspot areas (1821-1989), yearly sunspot areas
(1821-1994) and yearly mean latitudes of sunspots (1854-1985)
were created by compilation of pre-Greenwich observational
data sets (by Schwabe, Carrington, De La Rue, Sporer) and
post-Greenwich observations (Gnevysheva) to Greenwich general
Ref: Nagovitsyn Yu. A. The series of total sunspot area index in the Greenwich general system (1821-1989). // "Solnechnye dannye. 1995-1996" Bulletin. PP.38-48. 1997. (in Russian).
Yearly polar faculae numbers were constructed by synthesis of
different data series: Mt.Wilson, Greenwich, Lyon, Kodaykanal,
Tokyo, Zurich, Kislovodsk observations of polar facula and
observations of polar coronal structures during solar
Ref: Nagovitsyn Yu.A. A synthetic series of yearly means of polar faculae numbers for 1847-1979. // "Solnechnye dannye" Bulletin. No 8. PP. 88-95. 1988. (in Russian).
Series of yearly Wolf numbers for 1090-2002. Based on
Krylov-Bogolyubov's approach to the description of weakly
nonlinear oscillatory processes, the nonstationary
frequency-amplitude structure of the Wolf numbers (1700-1995)
was analyzed. Using the nonlinear description and well-known
Schove's data on the epochs of extrema of 11-yr solar cycles
in the past, the yearly average Wolf numbers in 1090-1699 were
Ref. Nagovitsyn Yu.A. A nonlinear mathematical model for the Solar cyclicity and prospects for reconstructing the Solar activity in the Past.// Astronomy Letters. Vol. 23. No. 6. PP. 742-748. 1997.
Yearly polar faculae numbers for 1705-1999 were created by
procedure similar to one used for the Wolf numbers reconstruction
(in assumption that 11-yr cycles of polar faculae develop in
exact antiphase to sunspot cycles).
Ref. Nagovitsyn Yu.A. The Solar cyclicity on the large time scale. // Proceedings of conference "New cycle of Solar activity: observational and theoretical aspects". Pulkovo. 1998. PP.321-324 (in Russian).
GRAPHICS. The figures show variations of the mentioned above indices. Time intervals of ESAI-extension of solar activity parameters are marked by the blue colour.