Focus Meeting 3, held during the IAU General Assembly 2027 in Rome
Abstract
Understanding how magnetic fields connect and interact across the solar and stellar atmospheres is a central challenge in modern astrophysics. The chromospheric–coronal interface is key to explaining how energy and mass are transported, stored, and released in these environments. This FM will bring together observers and modelers to address the physics governing this complex region, where magnetic restructuring, heating, and dynamic events originate.
Recent advances in high-resolution spectropolarimetry, coronal magnetic-field measurements, and multi-temperature spectroscopy now allow us to probe this interface with unprecedented detail, linking fine-scale plasma dynamics to large-scale magnetic connectivity. Multi-vantage observations provide a global framework connecting the interface to the solar wind and guiding the interpretation of exoplanetary environments. With major active and upcoming facilities, including DKIST, Solar Orbiter, MUSE, Solar-C, and the European Solar Telescope, it is timely to synthesize progress and define future directions in understanding chromosphere–corona magnetic coupling in the Sun and other stars.
Key Focus Meeting Topics
- Recent advances in spectropolarimetric observations of the chromosphere and prospects for routine coronal magnetic field measurements (solar and stellar contexts), including novel inversion techniques and their comparison and validation with numerical models.
- Fundamental processes of coronal heating and solar wind acceleration: observational evidence and numerical modelling, and implications for stellar winds in cool stars.
- The role of magnetic connectivity in destabilizing the atmosphere, flares, eruptions, and space weather in the solar system and exoplanetary systems.
- The chromosphere–coronal magnetic connectivity as an interface between the dynamo and the interplanetary magnetic field.
- Future developments in instrumentation and observational strategies.