| Session Details | |
| Section | ST - Solar & Terrestrial Sciences |
| Session Title | Magnetic Structuring of the Solar Atmosphere as Drivers of Variability |
| Main Convener | Prof. S. Sirajul Hasan (Indian Institute of Astrophysics, India) |
| Co-convener(s) | Prof. Robertus Erdelyi (Sheffield University, United Kingdom) Dr. Nat Gopalswamy (GSFC, NASA, United States) |
| Session Description | Dynamo generated magnetic field from the interior of the Sun controls a host of active phenomena in its outer layers by structuring and coupling them. This coupling extends all the way to the corona, into the solar wind, the Earth's magnetosphere and beyond. Sunspots, plages, and other small-scale structuring in the photosphere take various forms through the higher atmospheric layers, and modern solar observations dominated by space missions are providing unprecedented potential and opportunities to identify, relate and unify the various physical processes involved. In this session, we will focus on the role of physical processes that are dependent on such structuring and that drive the solar radiative variability, especially spectral irradiance variability: photospheric drivers such as convective flows and their interaction with magnetic field - emerging as well as pre-existing, shearing motions and explosive magnetic field reconnectionsleading to flares and eruptions, generation of magnetic field guided waves and their non-linear development into shocks and dissipation. Discussion of latest science from various cutting-edge observing facilities, including space missions such as Hinode and Stereo, and multi-wavelength observations would be given priority. We will also include discussions of physics-based modelling of the connected processes that account for the various signatures of solar variability observed through indirect proxies on Earth, such as, cosmogenic isotopes 14C and 10Be in ice cores and tree rings. |