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Date: Wednesday 9 December at 3.15 p.m.
Place: Observatory Lecture Room

Speaker: Nadezhda Zolotova (St. Petersburg State University)

Title: Asymmetry of hemispheric sunspot activity

Abstract: The secular variation of phase relation between sunspot activity in the solar hemispheres is discussed. By means of cross-recurrence technique the so-called North-South asymmetry is analysed. Anti-phase relation between N-S asymmetry and distribution of sunspots at latitudes is discussed, using data from Maunder minimum to the present, (Ribes & Nesme Ribes, Staudacher, Gamilton & Gimilgham, Carrington, Spörer and Greenwich data, 1645-2009).