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- W3104582409 endingPage "20" @default.
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- W3104582409 abstract "We calculated the 3D distribution of the area expansion factors in a potential magnetic field extrapolated from the high-resolution textit{Hinode}/SOT magnetogram of a quiescent active region NOAA 11482. Retaining only closed loops within the computational box, we show that the distribution of area expansion factors show significant structure. Loop-like structures characterized by locally lower values of the expansion factor are embedded in a smooth background. These loop-like flux-tubes have squashed cross-sections and expand with height. The distribution of the expansion factors show overall increase with height, allowing an active region core characterized by low values of the expansion factor to be distinguished. The area expansion factors obtained from extrapolation of the SOT magnetogram are compared to those obtained from an approximation of the observed magnetogram by a series of 134 submerged charges. This approximation retains the general flux distribution in the observed magnetogram, but removes the small-scale structure in both the approximated magnetogram and the 3D distribution of the area expansion factors. We argue that the structuring of the expansion factor can be a significant ingredient in producing the observed structuring of the solar corona. However, due to the potential approximation used, these results may not be applicable to loops exhibiting twist neither to active regions producing significant flares." @default.
- W3104582409 created "2020-11-23" @default.
- W3104582409 creator A5004479848 @default.
- W3104582409 creator A5004575215 @default.
- W3104582409 creator A5020621205 @default.
- W3104582409 date "2014-10-30" @default.
- W3104582409 modified "2023-10-06" @default.
- W3104582409 title "ON THE AREA EXPANSION OF MAGNETIC FLUX TUBES IN SOLAR ACTIVE REGIONS" @default.
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