Emergence and evolution of active and ephemeral regions: Comparison between observations and models |
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Authors: | Francesca Zuccarello Salvatore L Guglielmino Viviana Battiato Lidia Contarino Daniele Spadaro Pado Romano |
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Institution: | 1.Dipartimento di Fisica e Astronomia,Universitá di Catania,Catania,Italy;2.INAF Osservatorio Astrofisico di Catania,Catania,Italy |
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Abstract: | This work aims to describe some aspects relevant to the emergence of magnetic structures on the solar surface. Using high
resolution photospheric and chromospheric data, besides than EUV images acquired by space telescopes, the dynamics of rising
flux tubes is studied. It is shown that, for both long-lived and short-lived magnetic regions, the flux tubes are initially
characterized by a high rising velocity, which eventually decreases as the region develops. Other results concern the timeline
of the active regions appearance in the atmospheric layers and the asymmetries in plasma downflows between preceding and following
legs of the flux tubes. These results are briefly discussed in the light of most recent models. |
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