The dependence of the magnetism of a near-limb sunspot on height
Authors:
M. Benko, P. Gomory a S. J. Gonzalez Manrique
Image & caption:
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Image caption::
The stratification of the magnetic field vector in the solar atmosphere. The displayed heights are not in scale. The left column displays the vector magnetic field in the spherical coordination system. The right column displays the vector magnetic field in the Cartesian coordination system. The vector stratification comprises of the calcium and silicon spectral lines for the photosphere and helium spectral line for chromosphere.
Description:
In this article, we investigated the magnetic and dynamical properties in the atmosphere above
a sunspot, from the photosphere to the chromosphere. Observations were obtained with the GREGOR/GRIS. By applying fundamental magnetic field properties and geometry, we directly determined the height of the chromospheric spectral line He I 10830 from the observed data. Our analysis revealed that the helium spectral line is located at a height of 970 km above the photospheric spectral lines. Throught the physical processing of the data, we determined the parameters of the magnetic field and their gradients. We found that the total magnetic field strength decreases with height above the sunspot. Additionally, we discovered that the key parameters depending on height in the sunspot are the Bz component of the magnetic field for the umbra and the Bhor component of the magnetic field for the penumbra. The observation revealed supersonic downward velocities in and near the outer penumbra.
Reference:
BENKO, Martin - BALTHASAR, Horst - GÖMÖRY, Peter - KUCKEIN, Christoph GONZÁLEZ MANRIQUE, Sergio Javier. The dependence of the magnetism of a near-limb sunspot on height. In Astronomy and Astrophysics, ISSN 0004-6361, 2024, vol. 686, article no. A194, p. 1-11. (2023: 5.4 - IF, Q1 - JCR, 1.896 - SJR, Q1 - SJR, karentované - CCC). (2024 - Current Contents, WOS, SCOPUS, NASA ADS). Dostupné na: https://doi.org/10.1051/0004-6361/202348617 . Počet citácií 0.
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