ESPOS Seminar: Magnetic properties of short-lived penumbral microjets

Los seminarios europeos en línea de física solar (ESPOS por sus siglas en inglés) son una serie de seminarios regulares celebrados por videoconferencia entre instituciones europeas. Se propone conectar grupos europeos de física solar a través de una serie regular de seminarios abiertos en línea. El objetivo es construir una plataforma efectiva y abierta para el intercambio de ideas científicas. Los seminarios en línea permiten a los investigadores compartir su trabajo de manera más amplia con una audiencia especializada, y dan exposición a la investigación de vanguardia para estudiantes y otros investigadores jóvenes que no viajan regularmente a conferencias.
Web announcement: https://espos.stream/2020/03/05/Siu/
Author: Azaymi Litzi Siu Tapi
Title: Magnetic properties of short-lived penumbral microjets
Date:  5 of March, 2020, at 11.00h
Place: Sala de Sminaris, 3er pis Dpt. Física, Edifici Mateu Orfila, UIB
Abstract: Studying the polarization properties of penumbral microjets that have the shortest durations requires spectropolarimetric observations with the fastest temporal cadence possible and is currently a challenging task. Here, we approach this task using fast-cadence spectropolarimetric measurements of the Ca II 8542 A line made with the CRISP instrument at the Swedish 1 m Solar Telescope. We exploited the diagnosis capabilities of this line to retrieve the magnetic field configuration and its evolution in the upper photosphere and low chromosphere by applying the weak field approximation to its wings and line core wavelengths respectively. We found that the short-lived microjets are associated with a transient perturbation in the photospheric magnetic field and sometimes they show clear but weaker changes in the chromospheric field as well. We will describe the different types of evolution that were identified.