Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..293s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 288, no. 1, p. 293-298
Astronomy and Astrophysics
Astrophysics
67
Asymmetry, Dynamo Theory, Faculae, Nonlinear Equations, Northern Hemisphere, Solar Magnetic Field, Southern Hemisphere, Spatial Distribution, Sunspots, Data Correlation, Magnetohydrodynamics, Sunspot Cycle
Scientific paper
It is well-known that the number of active regions (sunspots and facula) in each solar hemisphere is not the same at a given time. Such north-south asymmetries have been recently considered by Jennings & Weiss (1991) and Jennings (1991). In a non linear regime, an azimuthal field can be generated from a dominant dipole and a weak quadrupole mode. This leads to a small north-south asymmetries in the field strength. A very interesting aspect of the nonlinear dynamo equations is the existence of another solution for which the dipole and the quadrupole component are similar in strength. This leads to a situation with almost no sunspot activity in one hemisphere and a butterfly diagram restricted to a single hemisphere. Such a situation did occur during the Maunder minimum, from about 1660 to 1704, where sunspots were sighted in a single hemisphere and within a narrow latitude band hardly exceeding 20 deg.
Nesme-Ribes Elizabeth
Sokoloff Dimitry
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