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- W2005350728 abstract "Coronal loop emission profiles are often of remarkably constant width along their entire lengths, contradicting expectations based on model coronal magnetic field strengths decreasing with height. Meanwhile P. Bellan has produced a theoretical model in which an initially empty, twisted force-free loop, on being filled with plasma via upflow at each footpoint, in the absence of significant gravitational effects, forms a narrow, filamentary loop of constant cross section. In this paper, we focus on equilibrium states that include stratification by uniform gravity while retaining the effects of magnetic field twist. Comparing these with related force-free equilibria, it is found that injection of low-β plasma under coronal conditions is not likely to change the shape of a loop significantly. These linear equilibria apply to the interiors and boundaries of loops only, with external influences modeled by boundary total pressures. The effects of total pressure balance with surroundings and of gravitational stratification are to inhibit the pinching of a loop to a constant cross section. Only if the plasma β were high enough for the plasma to reconfigure the external field and the hydrostatic scale height much greater than the loop size could the final state have nearly constant cross section. We do not expect this to occur in the corona." @default.
- W2005350728 created "2016-06-24" @default.
- W2005350728 creator A5010350957 @default.
- W2005350728 date "2008-07-10" @default.
- W2005350728 modified "2023-09-23" @default.
- W2005350728 title "On the Expansion of Quasi‐Static, Twisted Coronal Loops in Uniform Gravity" @default.
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- W2005350728 doi "https://doi.org/10.1086/588271" @default.
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