The Analysis of Penumbral Fine Structure Using an Advanced Inversion Technique

Abstract

We present a method to study the penumbral fine structure using data obtained by the spectropolarimeter onboard HINODE. For the first time, the penumbral filaments can be considered as resolved in spectropolarimetric measurements. This enables us to use inversion codes with only one-component model atmospheres, and thus assign the obtained stratifications of plasma parameters directly to the penumbral fine structure. This approach is applied to the limb-side part of the penumbra in active region NOAA 10923. The preliminary results show a clear dependence of the plasma parameters on continuum intensity in the inner penumbra, i.e. weaker and horizontal magnetic field along with increased line-of-sight velocity are found in the low layers of the bright filaments. The results in the mid penumbra are ambiguous and future analyses are necessary to unveil the magnetic field structure and other plasma parameters there.

7 pages, 6 figures, submitted to PASJ

References in corpus (3)

• Magnetostatic penumbra models with field-free gaps
• Two-dimensional spectroscopy of a sunspot. III Thermal and kinematic structure of the penumbra at 0.5"
• On the fine structure of the sunspot penumbrae. III The vertical extension of penumbral filaments

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• Evidence for convection in Sunspot penumbrae
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• Temporal Relation between Disappearance of Penumbral Fine-Scale Structure and Evershed Flow