The EGU conference will be held in Vienna, Austria, and online from May 3 to May 8, 2026. The deadline for abstract submission is 15 January 2026, 13:00 CET. Sessions relevant to ATST can mostly be found in the ST Programme Group, in the following sub-programmes:
- ST1 – The Sun and Heliosphere
- ST2 – Magnetosphere
- ST3 – Ionosphere and Thermosphere
- ST4 – Space Weather and Space Climate
You will find below sessions that have been specifically advertised to ATST.
Session ST1.11 – The physics of the large scale heliosphere: measurements, theory and modeling
Conveners: Kostas Dialynas, André Galli, Eleonora Puzzoni, Pontus Brandt
If you are planing to participate in the next European Geosciences Union (EGU) General Assembly (Vienna, 3-8 May 2026), kindly consider submitting your abstract(s) to our Session (ST1.11), which focuses on discussing the science results and open questions pertaining to the physics of the large scale heliosphere (theory, models and measurements):
Our sun’s astrosphere, that we call the Heliosphere, is formed by the interaction of the solar wind (SW) with the Very Local Interstellar Medium (VLISM). The ground-breaking observations of the two Voyager spacecraft provided in-situ particle and fields measurements throughout the upwind direction of the heliosphere, confirming the formation and position of the termination shock (TS) where the free expansion of the supersonic SW terminates and transitions into the heated non-thermal plasma region called the heliosheath (HS). The latter acts a reservoir of ions and electrons which extends to the heliopause (HP), the interface between our solar bubble and the interstellar environment. Those measurements were placed in a global context by the remotely sensed Energetic Neutral Atom (ENA) observations from IBEX, SOHO/HSTOF, as well as Cassini/INCA. As the Voyagers continue to provide invaluable information from the VLISM, a region in space that may become accessible again by a future Interstellar Probe mission, the New Horizons spacecraft is providing important observations of Pickup Ions (PUIs) in the supersonic SW. New Horizons is expected to reach the TS in the 2027-2034 time frame, where it will obtain continuous plasma moments and high resolution data of PUIs and energetic particle spectra at the TS and in the heliosheath. With new ENA measurements from the IMAP mission, the focus of the heliospheric community (e.g. the SHIELD NASA-DRIVE Center) is turned to combining all available observations and advanced models to construct a predictive model for the large scale heliosphere and examine its role in modulating the Galactic Cosmic Rays (GCRs). Further, recent research examines the effects of the Sun’s passage through massive interstellar clouds on the shape and size of the heliosphere, as well as the resulting implications for Earth’s climate and biodiversity. The session welcomes contributions that are related (but not limited) to: analyses of spacecraft observations, numerical and analytical models concerning the large-scale structure and dynamics of the heliosphere and other astrospheres, the interaction of our heliosphere with the VLISM over its journey through the galaxy and its effects on Earth’s climate, as well as the science (open questions, puzzles and discussions) that drive the requirements for measurements and instrumentation from future spacecraft missions to better understand the physics of our heliosphere and its interstellar environment.
(Transmis par Dimitra Koutroumpa)