The structure of a penumbral connection between solar pores
| Autor: | S. Stangl, Johann Hirzberger, Jan Jurcak, K. G. Puschmann, M. Sobotka, K. Gersin |
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| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Physics
Sunspot Photosphere 010504 meteorology & atmospheric sciences Flux tube Field line Penumbra Astronomy and Astrophysics Astrophysics 01 natural sciences photosphere magnetic fields Sun sunspots Material flow Magnetic field Flow (mathematics) Space and Planetary Science 0103 physical sciences 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Popis: | High resolution 2D-spectro-polarimetric observations have been used to analyse the magnetic field and flow topologies of a penumbral connection between two opposite polarity solar pores. A filamentary structured Evershed-like material flow from one pore to the other along the magnetic field lines has been detected. The flow channels are co-spatial with bright penumbral filaments close to the pore which feeds the flow and the clear brightness-velocity relation vanishes close to the pore which represents the sink of the flow. The boundary between umbra and penumbra of the two pores show significant differences: bright comet-like penumbral grains represent endings of penumbral filaments at the flow sources whereas no such grains were found at the sinks of the flow. Furthermore, a systematic variation of the asymmetries of measured Stokes V profiles across the penumbral connection have been found. The obtained results are in accordance with the widely-accepted uncombed penumbra hypothesis and the moving flux tube model. peerReviewed |
| Databáze: | OpenAIRE |
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