Latitude variations of photospheric activity areas with particular reference to solar faculae

Physics

Scientific paper

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Faculae, Photosphere, Solar Activity Effects, Solar Atmosphere, Sunspots, Atmospheric Models, Latitude Measurement, Solar Cycles, Solar Physics

Scientific paper

Detailed studies of the development of photospheric activity centres for two solar cycles show that Spoerer's Law holds in a very similar form to that applying to sunspots for the faculae which inhabit the sunspot zones. Similar differences between the two solar hemispheres can arise, and it seems to be confirmed that the average latitude of faculae tends to be a few degrees poleward of that of sunspots throughout a given cycle. It is shown that the normal averaging process involved in deriving Spoerer's Law obscures a detail which is revealed in a breakdown into the variations within successive narrow latitude strips. These show the existence within a cycle of three separate maxima of activity occurring at different epochs and with different preferred latitudes. The main properties of these maxima are discussed.

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