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Pulses of Solar Activity and Related Photospheric Latitudes

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Abstract

The data regarding the sunspots observed at Catania Astrophysical Observatory during the solar cycles 20, 21, and 22 have been used, with the aim of getting a more accurate description of the spot distribution and of its cycle-related variations. The following conclusions may be drawn: the activity cycle is articulated in several pulses, which are irregularly variable both in number and intensity from cycle to cycle; the photospheric sites, giving rise to such activity outbursts, are located – at least in many cases – on the poleward side of the pre-existing spot baricentric latitude, so as to produce a significant poleward displacement of that latitude.

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  1. Osservatorio Astrofisico di Catania, CNR – Gruppo Nazionale di Astronomia, U.d.R. di Catania, Città Universitaria, I-95125, Catania, Italy

    MAURIZIO Ternullo

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  1. MAURIZIO Ternullo
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Ternullo, M. Pulses of Solar Activity and Related Photospheric Latitudes. Solar Physics 172, 37–43 (1997). https://doi.org/10.1023/A:1004966122444

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