IAUS400

Solar and Stellar Multi-scale Activity

International Astronomical Union Symposium 400
2025

Medellín
21-25 July

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The symposium will address critical knowledge gaps in solar and stellar physics, leveraging recent advancements and fostering collaboration between traditionally independent solar and stellar communities. The Scientific Organizing Committee comprises experts from renowned institutions worldwide, ensuring a diverse and comprehensive exploration of multi-scale solar and stellar activity. The symposium will strategically align with pivotal advancements in solar missions and ground-based instrumentation, offering a timely platform for knowledge exchange. The programme will cover diverse themes, including observatories, energy release processes, magnetic variability, machine learning, and helio/astero-seismology, ensuring a comprehensive exploration of solar and stellar phenomena. The symposium will take place at the heart of Colombia’s coffee region, in Medellín, known as the city of “Eternal Spring”, thanks to its pleasant climate and picturesque landscapes. Medellín has become a major hub for academic studies and tourism, and has been awarded prestigious prizes for urban development and innovation in the last 20 years.

Scientific Organising Committee

Eliana Amazo Gómez (AIP, Germany)
Patrick Antolin (Northumbria University, UK)
Anne-Marie Broomhall (University of Warwick, UK)
Juan Camilo Buitrago (UC Berkeley, US)
Jose Iván Campos (Astronomical Institute of the Czech Academy of Sciences, Czech Rep.)
Hebe Cremades (CONICET, Universidad Tecnológica Nacional, Argentina)
Cecilia Garraffo (Harvard-Smithsonian/CfA, US)
Moira Jardine (University of St Andrews, UK)
Lucia Kleint (University of Bern, Switzerland)
Juan Carlos Martínez (UC Berkeley, US)
Sophie Musset (JHUAPL, US)
Kosuke Namekata (NAOJ, Japan)
Alexander I. Shapiro (MPS, Germany)
Santiago Vargas (Universidad Nacional de Colombia, Colombia) - Chair
Tom Van Doorsselaere (KU Leuven, Belgium)

Local Organising Committee

Adriana Araujo (Gimnasio Campestre)
Benjamín Calvo Mozo (Universidad Nacional de Colombia) - Chair
Germán Chaparro (Universidad de Antioquia)
Jessica Ducon (Project Manager)
Maria Gracia Batista (Universidad de Los Andes)
Angela Perez (NAEC-Colombia OAE)
René Restrepo (EAFIT)
Andrés Torres (ITM Institución Universitaria)

TOPICS

Advancements in Solar and Stellar Observatories and Instrumentation

Explore the latest technological breakthroughs in solar and stellar observatories, including missions like Solar Dynamics Observatory (SDO), Interface Region Imaging Spectrograph (IRIS), HINODE, Parker Solar Probe, Solar Orbiter, DKIST, GREGOR, Solar Swedish Tower (SST), New Solar Telescope (NST), and NVST. Discuss how these advancements contribute to a deeper understanding of solar and stellar atmospheres and internal structures. On the stellar side, observations are reaching the point of solar comparison, in some cases with higher temporal and in particular spectral resolution. The future is promising for stellar observations, the upcoming of high resolution instruments such as the ANDES spectrograph at the The Extremely Large Telescope (39 m, E-ELT), or the G-CLEF instrument at the Giant Magellan Telescope (25.4 m, GMT).

Solar and Stellar Energy Release Processes and Multi-Layer Transport

Investigate the intricate processes driving energy production and transport in the solar and stellar atmospheres. Explore multi-layer transport phenomena, including the small- to large-scale conversion of magnetic field energy leading to coronal and flare heating, waves and flows from the photosphere to the inner and extended corona. Discuss how these processes impact the overall energy balance of stars and their environments.

Solar-Stellar Magnetic Variability
and its Impact on the Planetary Environment

The analysis of solar and stellar magnetic variability is a prerequisite to properly understanding the behavior and evolution of stellar systems as a whole. The interplay of small scale phenomena and its effects on the large scale magnetic behaviour is not yet well understood. Solar-stellar energetic transient events, the associated particle bombardment, magnetized outflows and winds must be accounted for a consistent characterization of habitability conditions. State-of-the-art findings in these leading topics will nurture a comprehensive exploration of the Sun-Earth system, as well as the Stellar-Exoplanetary interactions.

Machine Learning
in Solar and Stellar Research

Explore the application of machine learning techniques in solar and stellar research. Discuss how automatic feature detection, data analysis, and the development of physically-meaningful algorithmsarerevolutionizingtheunderstandingofcomplexsolar and stellar physics problems. Highlight the role of machine learning in handling vast datasets generated by advanced instruments.

Insights from
Helio and Asteroseismology

Gain insights from helioseismology and asteroseismology techniques, which provide information about the interiors of stars. Discuss the widespread use of helioseismology in the solar community and its relevance in understanding large and small-scale phenomena. Explore how asteroseismology contributes to a closer connection between solar and stellar fields, aiding in comprehending the generation of various phenomena from the stellar interior. Examine recent developments in understanding the dynamic processes that govern magnetic field generation on both global and local scales.

Important Dates

21 July 2024: First announcement
21 October 2024: Second announcement
21 October 2024: Abstract submission opens
21 January 2025: Registration opens
21 January 2025: IAU Travel Grants deadline
21 January 2025: Abstract submission deadline (oral)
21 March 2025: Abstract submission deadline (poster)
21 March 2025: Communication of selected oral contributions and grants awarded
21 April 2025: Communication of selected poster contributions
21 April 2025: Early registration deadline
21 May 2025: Registration deadline
21-25 July 2025: IAU Symposium 400 in Medellín
21 August 2025: Proceeding submission deadline

Event Venue

The event will be held at the Fundadores Auditorium, one of the premier event spaces on the EAFIT University campus, located in the heart of Medellín, Colombia. This modern auditorium is equipped with state-of-the-art audio and visual systems, comfortable seating for a large audience, and an elegant design that creates a welcoming atmosphere for conferences, presentations, and cultural event

Program Under Construction

The detailed program for the symposium will be made available in the coming months. We will continually update it as we receive and review the accepted contributions. This phased release will ensure that attendees have the most current and comprehensive information about the sessions, speakers, and activities planned. Stay tuned for updates and check back regularly to see the latest additions to our exciting lineup.

Submit your abstract, register for the symposium, and apply for student grants. Don’t miss the opportunity to present your research, participate in the discussions, and secure convenient accommodation options during the IAU Symposium 400, taking place from July 21-25, 2025, in Medellín, Colombia.
Stay tuned for more updates!.

Publication of Proceedings

The proceedings of the IAUS400 symposium will be published in the IAU Proceedings Series by Cambridge University Press (CUP) in February 2026. To ensure your contributions are included, all papers must be submitted by August 15, 2025. This deadline is crucial for the review, revision, editing, and typesetting processes. Unfortunately, any submissions received after this date will not be accepted for publication. The submission window will be open until August 20, 2025.
We look forward to your valuable contributions!