Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-09
Int.J.Mod.Phys. A20 (2005) 6584-6596
Astronomy and Astrophysics
Astrophysics
13 pages, 4 figures, overview talk at 19th European Cosmic Ray Symposium, Firenze, Italy, 30.08-4.09.2004 (to be published in
Scientific paper
10.1142/S0217751X05029629
It is evident that models of the knee should match the observational phenomenology. In this talk I discuss a few aspects of phenomenology, which are important not only for the understanding of the knee origin, but also for the general problem of the origin of cosmic rays. Among them are the shape of the energy spectrum, its irregularity, the sharpness of the knee and its fine structure. The classification of models is given and some examples of the most recent models are discussed. The most probable conclusion deduced from this examination is that the knee has an astrophysical origin and the so called 'source' models of the knee are most likely among them.
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