Letters of Intent received in 2019

LoI 2021-2117
GA Symposium: Solar and Stellar variability: from the interiors to space weather

Date: 17 August 2021 to 20 August 2021
Location: Busan, Korea, Rep of
Contact: Irina Kitiashvili (Irina.N.Kitiashvili@nasa.gov)
Coordinating division: Division E Sun and Heliosphere
Other divisions: Division A Fundamental Astronomy
Division B Facilities, Technologies and Data Science
Division C Education, Outreach and Heritage
Division D High Energy Phenomena and Fundamental Physics
Division E Sun and Heliosphere
Division F Planetary Systems and Astrobiology
Division G Stars and Stellar Physics
Chair of SOC: Irina N Kitiashvili (None)
Chair of LOC: None (None)



1. Observations of the multiscale Solar and stellar activity
2. Modeling of the solar and stellar dynamics
3. Impact of solar and stellar activity on space weather
4. Numerical simulations of the solar and stellar interior dynamics and interaction with atmospheres
5. Magnetic interaction in solar and stellar chromospheres, coronae and winds
6. Effects of solar and stellar variability on planetary atmospheres and exospheres.
7. Forecasting of the solar and stellar activity and its impacts to the space environment.
8. Current and future missions and instrumentation for studying solar and stellar variability and exoplanet detection
9. Advances in massive data analysis and machine learning
10. Interlinks between the laboratory experiments and solar and stellar observations and modeling.



Observed solar and stellar activity manifestations reflect complex interactions of the interior dynamics with atmospheric layers and coronae across different stages of the stellar evolution. Disturbances originated by a complex interaction of turbulent flows and magnetic activity lead to accumulation of magnetic energy and eruptive energy release events that have dramatic effect on planetary environments. Understanding and predicting characteristics of various phenomena of the solar and stellar activity is critical for solving fundamental problems of heliophysics and astrophysics, such as the origins of space weather and forecasting of its impacts on the Earth and planetary environments, emergence and formation of sunspots and starspots, mechanisms of highly energetic eruptive flares and CME. This topic is also critically important for improving detection of the Earth-sized exoplanets, understanding evolution and dynamics of stellar properties, and characterization of the planetary atmospheres. Understanding pf processes associated with stellar turbulent dynamics and star-planet interaction will shed light on properties of orbiting planets and their environment.

At the present time, new unique observations from space and ground-based telescopes are complemented by the fast-growing computational capabilities that allow us to generate 3D time-dependent simulations of stellar radiative magnetoconvection that are capable reproduce the multiscale solar and dynamics with a high degree of realism. In addition, recent advances in laboratory plasma experiments allow us to make a clear connection between large-scale phenomena (such as flares and eruptions) and microphysics on the scales that are not resolved in observations (e.g., reconnection). At the same time, the exponential grown of observational data rises needs for development of new approaches to analyze observations and compare them with observation using machine-learning and data assimilation approaches. This Symposium will bring together observers, theoreticians, modelers and data scientists from different fields and provide a unique forum to exchange new advances, approaches, experience, and to develop new ideas across the different fields focusing on the key problems of solar and stellar variability and its impacts.