Journal
ASTRONOMY & ASTROPHYSICS
Volume 418, Issue 1, Pages L17-L20Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20040107
Keywords
Sun : photosphere; Sun : magnetic fields; Sun : sunspots; Sun : activity
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We report on significant periodic variations of the magnetic activity between the north and south hemisphere of the Sun. For this purpose, we have investigated the north-south asymmetry of two solar data sets, namely the Kitt Peak synoptic Carrington rotation maps of the photospheric magnetic field (1975-2003) and monthly averaged sunspot areas (1874-2003). Using Fourier and wavelet analysis, we have found a regular pattern of pronounced oscillations with periods of 1.50 +/- 0.04 yr. 1.79 +/- 0.06 yr and 3.6 +/- 0.3 yr in the magnetic flux asymmetry. The former two periods are related to a process which leads to a gradual shift in the excess magnetic flux from north to south or vice versa. Additional periods of 43.4 +/- 7.1 yr (twice the magnetic cycle) and 320-329 days were detected in the Sunspot asymmetry.
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