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- W1965921276 abstract "Recent studies of NOAA active region 10953, by Okamoto {it et al.} ({it Astrophys. J. Lett.} {bf 673}, 215, 2008; {it Astrophys. J.} {bf 697}, 913, 2009), have interpreted photospheric observations of changing widths of the polarities and reversal of the horizontal magnetic field component as signatures of the emergence of a twisted flux tube within the active region and along its internal polarity inversion line (PIL). A filament is observed along the PIL and the active region is assumed to have an arcade structure. To investigate this scenario, MacTaggart and Hood ({it Astrophys. J. Lett.} {bf 716}, 219, 2010) constructed a dynamic flux emergence model of a twisted cylinder emerging into an overlying arcade. The photospheric signatures observed by Okamoto {it et al.} (2008, 2009) are present in the model although their underlying physical mechanisms differ. The model also produces two additional signatures that can be verified by the observations. The first is an increase in the unsigned magnetic flux in the photosphere at either side of the PIL. The second is the behaviour of characteristic photospheric flow profiles associated with twisted flux tube emergence. We look for these two signatures in AR 10953 and find negative results for the emergence of a twisted flux tube along the PIL. Instead, we interpret the photospheric behaviour along the PIL to be indicative of photospheric magnetic cancellation driven by flows from the dominant sunspot. Although we argue against flux emergence within this particular region, the work demonstrates the important relationship between theory and observations for the successful discovery and interpretation of signatures of flux emergence." @default.
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- W1965921276 date "2011-06-08" @default.
- W1965921276 modified "2023-09-23" @default.
- W1965921276 title "On Signatures of Twisted Magnetic Flux Tube Emergence" @default.
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- W1965921276 doi "https://doi.org/10.1007/s11207-011-9789-3" @default.
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