6–10 Sept 2021
Online
Europe/Rome timezone

Case studies of penumbral decay

8 Sept 2021, 15:05
13m
Online

Online

Poster Session 2 - The Solar Atmosphere: Heating, Dynamics and Coupling Poster Session 7.2

Speaker

Dr Mariarita Murabito (INAF OAR)

Description

High-resolution spectropolarimetric ground-based observations, complemented with data from the space instruments, allow us to investigate the photospheric magnetic and velocity properties of sunspot penumbra during the formation and decay phases. The observed penumbral formation occurs only on one side of the studied region. This preferential location appears to be due to the absence of an overlying magnetic canopy, as derived from potential field extrapolations of the SDO/HMI data. Then, the studied penumbra disappears progressively in both time and space. The progressive disappearance of different penumbral sectors seems to be linked with the presence or absence of overlying canopies. Noticeably, we detect Evershed flows and horizontal fields after the apparent disappearance of the penumbral sectors.

Primary authors

Dr Mariarita Murabito (INAF OAR) Dr Salvatore Luigi Guglielmino (Istituto Nazionale di Astrofisica (INAF)) Ilaria Ermolli (Istituto Nazionale di Astrofisica (INAF)) Paolo Romano (Istituto Nazionale di Astrofisica (INAF)) Dr Shahin Jafarzadeh (University of Oslo) Luc Rouppe van der Voort (Rosseland Centre for Solar Physics, University of Oslo)

Presentation materials