Objectives

The main goal of our focused science team is to obtain a comprehensive picture of wave propagation in the lower solar atmosphere, ranging from the generation of waves in the sub-photospheric layers to their channelling and eventual dissipation in the magnetised outer atmosphere. In particular, the focus is on various (and often coupled) wave modes propagating through structures demonstrating a variety of sizes and properties, which can only be probed using the highest resolution imaging and spectro-polarimetric observations currently available. These studies shall provide us with insights into the coupling and conversion mechanisms between individual wave modes, in addition to quantifying the role these waves play in heating the solar chromosphere (and beyond). These studies will be performed using high-resolution observations interpreted, in tandem, with theoretical models and simulations. Below we identify key objectives of the project, which will strive to identify information linked to:

  • The sub-surface generation of waves (e.g., how coherency/amplitudes may vary across features contained within the same field-of-view, and how these measurements can be utilised to uncover information related to sub-photospheric structuring)

  • Subsequent mode-coupling (e.g., determining where such preferential conditions exist and how efficient such mechanisms are)

  • Whether multiple modes regularly co-exist within certain structures (e.g., sunspots, magnetic bright points, spicules, filaments, etc.)

  • The prevalence of shock formation in the lower atmosphere (not solely acoustic shocks, but also intermediate and [possibly] Alfvén non-linearities)

  • How the energy is reflected (i.e., re-superimposing itself on to the photospheric observations), damped and/or dissipated in the form of atmospheric heating

  • A true comparison of high-resolution data with state-of-the-art numerical simulations and theoretical models, such as those from Bifrost, MURaM, and CO5BOLD codes; and

  • How asymmetric spectro-polarimetric signatures can be influenced by resolved (and potentially unresolved) wave activity