Hemispheric asymmetry of solar activity phenomena: north-south excesses rotational periods and their links to the magnetic field

Details Hemispheric asymmetry of solar activity phenomena: north-south excesses rotational periods and their links to the magnetic field Hemispheric asymmetry of solar activity phenomena: north-south excesses rotational periods and their links to the magnetic field

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..587t&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Physics

1

Solar Activity

Scientific paper

We present a cycle dependent analysis of various solar activity phenomena, namely Sunspot Numbers and Hα flares, including the time range 1975-2000. The data are studied on a statistical basis with relation to their spatial distribution, significance of the north-south asymmetry and rotational periods. For the considered time span we obtain significant values of north-south asymmetries. For the northern hemisphere the significant excesses are revealed during the increasing and maximum phase of a solar cycle whereas a southern excess dominates near the end of a cycle. Furthermore, we obtain differences in rotational periods and activity gaps between both hemispheres that suggest an independent evolution in hemispheric activity for these indices. Hence, a weak interdependence of the magnetic field system originating in the two hemispheres is suggested. Additionally we find differences in the dominant rotational periods of photospheric and chromospheric tracers.

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