Abstract
A few ideas emerge from modern developments: (a) the distinction between the quiet and active Sun is misleading and obsolete; (b) the theoretical treatment of the Sun as an isotropic sphere, without magnetism, is obviously not valid; (c) multilayer active phenomena are important as proxies for deeper phenomena more than per se; (d) the solar cycle cannot be described simply by the level of activity, but it needs a consideration of the latitudinal migrations of activity. These points emerge following a systematic look at each of the four parts of this paper, which deal with: 1) The Sun as a variable star (irradiance, radius, neutrino flux). 2) The coupling between rotation, magnetism, convection. 3) The active phenomena in outer layers. 4) The solar cycle and migrations. The conclusion is naturally oriented towards the development of more complete observations, both on the ground, coordinated over the Earth, and in space, using multiple satellites.
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Pecker, JC. (1994). The Sun today. In: Belvedere, G., Rodonò, M., Simnett, G.M. (eds) Advances in Solar Physics. Lecture Notes in Physics, vol 432. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-58041-7_196
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DOI: https://doi.org/10.1007/3-540-58041-7_196
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