Fredagskollokvium: Unravelling century old mysteries of the Universe's most important star ...and then encountering new ones
Vasco Henriques, Postdoc, ITA
Abstract: Features on the Sun such as sunspots and spicules have been observed and studied for over a century but only now, with the advent of high-resolution solar observations, are we understanding some of the fundamentals behind their structure and dynamics. This is the case with the critical role that convection plays in the structuring of the penumbra of sunspots and the case with the impact that spicules have across the different layers of the Solar atmosphere (in which the Earth is ultimately engulfed). To much of our delight there are no data that don't bring new questions together with the answers. Fine horizontal structuring in the umbra of sunspots, which are dominated by vertical magnetic fields, and unusual downflowing solutions when solving old radiative transfer problems for upward moving features are just two examples of a broader open puzzle that will be discussed. A preview of the unique data acquired this summer, peering into the near UV from the ground with the newest instrumentation at the Swedish 1-meter Solar Telescope, will also be presented.