Letters of Intent received in 2018

LoI 2020-2023
Non-GA Symposium: Solar Hydrodynamics

Date: 24 August 2020 to 28 August 2020
Location: Lomonosov Moscow State University, Russian Federation
Contact: Alexander Getling (a.getling@mail.ru)
Coordinating division: Division E Sun and Heliosphere
Co-Chairs of SOC: Klaus G. Strassmeier (Leibniz Institute for Astrophysics, Potsdam)
Leonid L. Kitchatinov (Institute for Solar-Terrestrial Physics, Irkutsk)
Alexander V. Getling (Contact Editor) (Lomonosov Moscow State University)
Co-Chairs of LOC: Mikhail I. Panasyuk (Lomonosov Moscow State University)
Alexander Getling (Lomonosov Moscow State University)
TBD (Lomonosov Moscow State University)



* Solar convection
* Differential rotation and meridional circulation
* Small-scale motions in the solar atmosphere
* Coronal mass ejections
* Magnetic reconnection in the solar atmosphere



The Sun as a complex hydrodynamic object has attracted much investigators' attention for a few past decades. By now, substnatial progress has been achieved in studies of solar convection, differential rotation, meridional circulation and local nonstationary flows associated with phenomena of solar activity. Solar-plasma motions are dynamically coupled with magnetic fields, and magnetohydrodynamics is an
inseparable constituent of solar hydrodynamics. Moreover, since magnetic fields are ubiquitous in the Sun, the applicabitliy of nonmagnetic hydrodynamics is restricted to the class of situations where magnetic fields do not significantly affect the dynamics of the solar plasma. A particular role in studying the flows of
solar plasma is nowadays played by helioseismology, which offers a previously unreachable insight into the dynamics of layers hidden from our eyes. Much progress is currently associated with hydrodynamic numerical simulations. Not only are they an efficient tool to treat hydrodynamic processes in complex systems, such as the Sun, but they play a special role for fluid mechanics in general, since the realisability of flows does not reduce to their stability determined by regular techniques of analyses.

Over the past 13 years, in essence, only IAU Symposium 239 ("Convection in Astrophysics", 2006)
dealt with themes directly fitting into the above-specified scope, although partially some of them were touched
upon in Symposium 247 ("Waves and Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology", 2007) and Symposium 294 ("Solar and astrophysical dynamos and magnetic activity", 2012). Thus, bringing together solar physicists engaged in observations and theory (including numerical simulation) of hydrodynamic processes in the Sun is long overdue. The planned meeting will be dedicated to all aspects of solar hydrodynamics, both global and local, and to various exploratory approaches. With such a scope assumed, the Symposium will hopefully stimulate the origin of new ideas and development of new techniques in this topical field of research.