HAO Colloquium - Alina Donea, Monash University

Analysis of Acoustic Emission from "Quiet Sun Areas"

In this talk I will present  the acoustic, magnetic and chromospheric  properties  of different types of  Quiet Sun: the Quiet Sun surrounding active regions, the Quiet Sun under a coronal hole and a ‘plain’  Quiet Sun. 

In contrast to its definition, the Quiet Sun exhibits a large range of dynamic phenomena associated with small scale magnetic field concentrations, plages and pores.  Pushed by convection and local near surface motions, the magnetic field accumulates at the boundaries of supergranules and form a magnetic network.  Bright chromospheric web-like patterns betray also  the presence of magnetic flux tubes, which expand with height.  I will discuss the acoustic properties of the supergranular networks,  and  focus on  the physics of  acoustic enhancements (pores haloes, glories) around some patches of network. The acoustic haloes of the Quiet Sun in the neighbourhood of active regions  tell us a different story. The  supergranular network and inter-network is  also analysed in  the  Photosphere/Chromosphere Ultraviolet light. We also selected a number of IRIS observations close to the disk-center  which zoomed into the supergranular networks of interest.  

Our aim is to examine whether differences between the magnetic and acoustic properties of the Quiet Sun Areas can answers questions related to the  wave interaction between the acoustic oscillations  and magnetic fields of the network or of  magnetic canopies.

Date and time: 
Wednesday, July 11, 2018 - 2:00pm to 3:00pm