Magnetic Solitons: Unified Mechanism for Moving Magnetic Features |
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Authors: | M Ryutova H Hagenaar |
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Institution: | (1) Lawrence Livermore National Laboratory/IGPP Livermore, Livermore, CA 94550, USA;(2) Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Palo Alto, CA 94304, USA |
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Abstract: | In a highly dynamic environment with sources and sinks of energy, flux tubes do not in general obey local conservation laws,
nor do the ensembles of flux tubes that exhibit collective phenomena. We use the approach of energetically open dissipative
systems to study nonlinear waves in flux tubes and their role in the dynamics of the overlying atmosphere. We present results
of theoretical and observational studies of the properties of moving magnetic features (MMFs) around sunspots and the response
of the overlying atmosphere to various types of MMFs. We show that all types of MMFs, often having conflicting properties,
can be described on a unified basis by employing the model of shocks and solitons propagating along the penumbral filaments
co-aligned with Evershed flows. The model is also consistent with the response of the upper atmosphere to individual MMFs,
which depends on their type. For example, soliton-type bipolar MMFs mainly participate in the formation of a moat and do not
carry much energy into the upper atmosphere, whereas shock-like MMFs, with the appearance of single-polarity features, are
often associated with chromospheric jets and microflares. |
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Keywords: | The Sun: nonlinear waves Photosphere Chromosphere and corona |
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