3 papers
astro-ph.SR2024
The Role of Sunspots Magnetic Configuration in the Formation of Umbral Fine-Structures
Hashem Hamedivafa
We use spectro-polarimetric data recorded by Hinode to analyze the magnetic field configuration of a part of a sunspot (AR 10923) where a bundle of penumbral filaments are intrudin…
astro-ph.SR2024
Structure of proper motions in a sunspot penumbra
Hashem Hamedivafa
We study the structure and evolution of the horizontal proper motions in a regular sunspot penumbra, very close to the solar disc center, in active region NOAA 11092 using a 48 min…
astro-ph.SR2016
A study on Ca II 854.2 nm emission in a sunspot umbra using a thin cloud model
H. Hamedivafa, M. Sobotka, L. Bellot Rubio +1
In the present work, we introduce and explain a method of solution of the radiative transfer equation based on a thin cloud model. The efficiency of this method to retrieve dynamic…