Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..155..257b&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 155, no. 2, p. 257-265
Astronomy and Astrophysics
Astronomy
1
Magnetic Flux, Polarity, Solar Convection (Astronomy), Solar Magnetic Field, Sunspot Cycle, Sunspots, Astronomical Observatories, Calcium, Histograms, Spectroheliographs, Time Dependence
Scientific paper
Positions of active regions estimated from observations of the whole solar disk in Ca II KIV during the period 1977-1989 at the Coimbra Astronomical Observatory are compared with the time-dependent latitudinal distribution of background solar magnetic fields and with the latitudinal shifts of boundaries of their polarities. We confirm that the sunspot groups are located near the zonal boundaries between the opposite polarities of the solar background magnetic field during different phases of the two recent consecutive cycles of activity. We demonstrate a probable connection between the increased number of groups and the commencement of poleward of zonal boundaries in both hemispheres. But the influence of the 'dominant convective rolls' seems to be still unclear. A new problem of interelation between the zonal and sector boundaries has also appeared.
Bumba Vaclav
Garcia Arnaldo
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