Hemispheric sunspot numbers ${R_{n}}$ and ${R_{s}}$ from 1945–2004: catalogue and N-S asymmetryanalysis for solar cycles 18–23

Publisher： Edp Sciences

E-ISSN： 1432-0746|447|2|735-743

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.447, Iss.2, 2006-02, pp. : 735-743

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