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Parallel sessions
Sessions
id
date time
2022-03-08 11:42:00
Non-equilibrium thermodynamics across scales: from the solar corona to the intracluster medium
Solar1
Cool plasmas in a thermodynamically non-equilibrium state with a mixture of temperatures (from 10^6 K to 10^4 K or below) are ubiquitous in different astrophysical systems such as solar & stellar coronae, galactic and AGN outflows, the circumgalactic (CGM), interstellar (ISM) and intra-cluster (ICM) media. The role of these multiphase plasmas has been highlighted in mass and energy cycles at all such scales, from thermal non-equilibrium (TNE) cycles in the solar atmosphere to feedback cycles that regulate the formation of galaxies. The properties of the cool plasmas across these multiple scales is strikingly similar, intimately linked to the as-yet unclear but fundamental mechanisms of coronal and ICM heating and instabilities of thermal or other nature. Being so close, the solar corona constitutes a formidable astrophysics laboratory where we can spatially and temporally resolve the production and removal of such multiphase plasma. The solar atmospheric response to coronal heating occurs across wide spatial and energetic scales. At large coronal loop scales, TNE cycles manifest through puzzlingly week-long EUV intensity pulsations that may be detectable in other stars. At small (~100 km) scales, the solar atmospheric response to heating comes through the generation of cool coronal rain, the seed of prominences, whose properties are similar to that of multiphase filamentary structure in the ISM and ICM or to molecular loops in the Galactic centre. Furthermore, the prominences formed at a star's co-rotation radius are now thought to be significant contributors to the wind mass loss rate. The efficiency of these unique wind gauges depend, however, on their formation and destruction mechanisms. In the solar atmosphere, an increased production of rain is seen for stronger heating extending to flares, whose features seem recurrent in active stars. While the quantity and morphology of the cool material is now known to be closely linked to the spatio-temporal properties of coronal heating and to the thermal misbalance that result in the formation and destruction mechanisms of multiphase plasma has long been a subject of research in the ISM/ICM. Despite the exciting new cross-disciplinary possibilities offered by the multi-scale and multi-energetic manifestation of cool plasma across the universe, the research in these various fields has progressed mostly independently. Hence, the aim of this session is to consolidate our understanding of the effects of perturbed thermal equilibrium on various dynamic processes at multiple scales in the universe where multiphase plasmas are observed. Furthermore this meeting will identify and strengthen the links between these disciplines, boost this research field in the UK, and seed the ground for future national and international collaborations.
Patrick Antolin, Prakriti Pal Choudhury, Tim Duckenfield, Andrew Fabian, Moira Jardine, Dmitrii Kolotkov, Prateek Sharma
Tues. 16:30-18:00 / Wed 09:00-10:30
16:30-16:48 Helen Russell: Multiphase plasma in massive galaxies
16:48-17:00 Valeria Olivares: Gas condensation in Brightest Group Galaxies unveiled with MUSE
17:00-17:12 Yuan Li: Turbulence in the intra-cluster medium probed with jellyfish tails
17:12-17:30 Andrew Hillier: Observations and theory to understand cool material in the solar corona
17:30-17:48 Valery Nakariakov: The corona of the Sun as an active medium for magnetoacoustic waves
17:48-18:00 Christopher Wareing: Simulations of thermal instability in the interstellar medium
09:00-09:20 Max Gronke: Shaken & stirred: dynamics of turbulent, multiphase gas
09:20-09:34 Seray Sahin: Spatial and Temporal Analysis of Quiescent Coronal Rain over an Active Region
09:34-09:52 Martin Farnir: Helioseismology and the solar cycle
09:52-10:16 Stephanie Walch: The formation and evolution of molecular clouds in the multi-phase interstellar medium
10:16-10:30 Samrat Sen: Evolution of the thermal and tearing modes in a current sheet: Explosive reconnection and formation of plasmoids
Martin Farnir: Understanding Non-adiabatic Processes Through Pseudomode Characterisation