Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-11
Astronomy and Astrophysics
Astrophysics
7 pages, 6 figures, submitted to PASJ
Scientific paper
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.
Bellot Rubio Luis
Ichimoto Kiyoshi
Jurcak Jan
Katsukawa Yukio
Lites Bruce
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