BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//7.2.3.1//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:99@atst.osups.universite-paris-saclay.fr DTSTART;TZID=Europe/Vienna;VALUE=DATE:20260503 DTEND;TZID=Europe/Vienna;VALUE=DATE:20260509 DTSTAMP:20260112T220326Z URL:https://atst.osups.universite-paris-saclay.fr/calendrier/egu-2026/ SUMMARY:EGU 2026: abstract submission DESCRIPTION:The EGU conference will be held in Vienna\, Austria\, and onlin e from May 3 to May 8\, 2026. The deadline for abstract submission is 15 J anuary 2026\, 13:00 CET. Sessions relevant to ATST can mostly be found in the ST Programme Group\, in the following sub-programmes:\n\n ST1 – The Sun and Heliosphere\n ST2 – Magnetosphere\n ST3 – Ionosphere and Th ermosphere\n ST4 – Space Weather and Space Climate\n\nYou will find bel ow sessions that have been specifically advertised to ATST.\n\n\n\n\nSessi on ST1.3 — Solar Orbiter: A new perspective on the Sun and the heliosphe re\nConveners: Henrik Eklund\, Jack Jenkins\, Adam Finley\, Stephanie Yard ley\, Daniel Verscharen\n\nThe Solar Orbiter mission\, an international co operation between ESA and NASA\, is currently orbiting the Sun at heliocen tric distances ranging from 0.95 to 0.29 au. Solar Orbiter now has an orbi tal inclination of 17 degrees and recently completed its first perihelion with this new perspective of the Sun’s poles in March 2025. As the missi on continues towards an inclination of approximately 33 degrees\, it is an exciting time to study dynamics within the inner heliosphere.\n\nThe over all goal of Solar Orbiter is to understand how the Sun creates and control s the heliosphere. The mission provides unprecedented imaging of the Sun ’s photosphere\, chromosphere\, and corona\, enabling studies of the ori gin and evolution of the Sun’s atmosphere\, the solar wind\, solar erupt ions\, and energetic particle events. The combination of high-resolution i maging and simultaneous in-situ measurements from Solar Orbiter’s inner- heliospheric vantage point offers a unique opportunity to link solar sourc es directly to their heliospheric impacts.\n\nThis session invites contrib utions that address the Solar Orbiter science objectives\, exploit multi-m ission data sets\, and studies of the connections between the Sun and the heliosphere. We also welcome Solar Orbiter-related contributions in the fi elds of theory and numerical simulations that contribute to a better under standing of the solar origins of heliospheric variability and space weathe r.\n\n\n\n\n\nSession ST1.10/NP1 — Theory and Simulations of Solar Syste m Plasmas\nConveners: Maria Elena Innocenti\, Shangbin Yang\, Natasha Jeff rey\, Victor Réville\, Giulia Murtas\n\nThis session is a forum for prese nting recent results related to theoretical and numerical investigation of heliospheric plasmas. Our regions of interest are the Sun and its corona\ , the solar wind and planetary magnetospheres. Processes of interest are m agnetic reconnection\, turbulence\, shock waves\, plasma instabilities\, p lasma heating and particle acceleration. We particularly welcome studies i ntegrating numerical modeling\, theoretical investigations and in-situ mea surements/remote observations from current and future space missions (MMS\ , Parker Solar Probe\, Solar Orbiter\, Bepi Colombo\, ASO-S\, Aditya-L1\, SMILE\, HelioSwarm\, SPO\, Plasma Observatory…). Any modeling approach\, from global to kinetic\, is at home here. We particularly encourage submi ssions on global modeling that go beyond single fluid MHD. The focus of th is year's session is the integration of kinetic-scale information into lar ger-scale models of heliospheric plasmas.\n\n(Transmis par Victor Réville )\n\n\n\nSession ST1.11 – The physics of the large scale heliosphere: me asurements\, theory and modeling\nConveners: Kostas Dialynas\, André Gall i\, Eleonora Puzzoni\, Pontus Brandt\n\nIf 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 questio ns pertaining to the physics of the large scale heliosphere (theory\, mode ls and measurements):\n\nOur sun’s astrosphere\, that we call the Helios phere\, 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 format ion 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 be tween our solar bubble and the interstellar environment. Those measurement s 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 Interste llar Probe mission\, the New Horizons spacecraft is providing important ob servations of Pickup Ions (PUIs) in the supersonic SW. New Horizons is exp ected to reach the TS in the 2027-2034 time frame\, where it will obtain c ontinuous plasma moments and high resolution data of PUIs and energetic pa rticle 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 observatio ns 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 passa ge through massive interstellar clouds on the shape and size of the helios phere\, as well as the resulting implications for Earth’s climate and bi odiversity. The session welcomes contributions that are related (but not l imited) to: analyses of spacecraft observations\, numerical and analytical models concerning the large-scale structure and dynamics of the heliosphe re and other astrospheres\, the interaction of our heliosphere with the VL ISM over its journey through the galaxy and its effects on Earth’s clima te\, as well as the science (open questions\, puzzles and discussions) tha t drive the requirements for measurements and instrumentation from future spacecraft missions to better understand the physics of our heliosphere an d its interstellar environment.\n\n(Transmis par Dimitra Koutroumpa)\nSess ion NP6.1/ST1/PS4 –Turbulence in Space Plasmas: Structures\, Waves\, and Dissipation\nConveners: Sergio Servidio\, Luca Sorriso-Valvo\, Julia Staw arz\, Giulia Cozzani\, Louis Richard\n\nThe session is dedicated to advanc ing our understanding of plasma turbulence across diverse environments\, f rom the solar wind and planetary magnetospheres to astrophysical systems. We welcome contributions spanning observational\, theoretical\, numerical\ , and laboratory approaches\, with a focus on open questions regarding coh erent structures\, wave-particle interactions\, dissipation mechanisms\, a nd cross-scale energy transport.\nWe encourage submissions related to spac e science\, astrophysical plasmas\, near-Earth processes\, heliospheric ph ysics\, turbulence theory\, high-performance numerical simulations\, and i nnovative satellite data analysis. In particular\, we seek contributions u tilizing data from current and past missions - including Wind\, Cluster\, MMS\, STEREO\, THEMIS\, Van Allen Probes\, and DSCOVR - with a special emp hasis on new findings from Parker Solar Probe and Solar Orbiter.\n\n(Trans mis par Giulia Cozzani)\nSession ST2.2/NP3/PS4 – Unveiling plasma energi zation and energy transport in Geospace via multiscale observations\nConve ners: Matthew Taylor\, Oreste Pezzi\, Giulia Cozzani\, Markku Alho.\n\nThi s session focuses on understanding how plasma is energized and how energy is transported across scales in the Earth’s Magnetospheric System. Key p rocesses include shock dynamics\, magnetic reconnection\, turbulence\, wav e-particle interactions\, and plasma jets. While past missions such as Clu ster\, MMS\, and THEMIS have revealed important single-scale physics\, ful ly capturing cross-scale coupling requires true multi-scale observations. The multi-scale approach is central to the Plasma Observatory (PMO) missio n concept.\n\nWe welcome contributions from observations\, simulations\, t heory\, and instrumentation\, as well as studies linking in-situ\, remote- sensing\, and ground-based measurements. Submissions highlighting multi-sc ale or cross-scale dynamics are particularly encouraged.\n\n(Transmis par Giulia Cozzani)\nSession ST3.6 – Polar and midlatitude ionosphere–atmo sphere studies through ground-based observations\nConveners: Maxime Grandi n\, Veronika Haberle\, Gaël Cessateur\, Jia Jia\, and Mathieu Barthelemy\ nThe Earth’s atmosphere and ionosphere are subject to significant variab ility associated with solar and space forcing. While this is predominantly relevant at high latitudes\, midlatitudes can also be affected as observe d during severe geomagnetic storms that occurred e.g. in 2024–2025. Whil e in situ observations of the ionosphere and mesosphere–lower-thermosphe re are only possible with spacecraft and sounding rockets\, a wealth of in formation is obtained thanks to remote sensing techniques using ground-bas ed instruments.\nFor instance\, ground-based magnetometers\, used in dense networks\, routinely enable the derivation of ionospheric currents and ge omagnetic indices. Optical instruments not only encompass imagers observin g auroral and airglow emissions\, but also consist of scanning Doppler ima gers\, Fabry-Perot interferometers\, and lidars which measure upper atmosp heric winds and temperatures\, in particular in the thermosphere and mesos phere. Besides\, visible spectrometers disentangle the spectral signatures of different auroral processes\, enabling discrimination between precipit ation-driven emissions and signatures of thermospheric heating. Ionospheri c parameters can also be measured with radars\, spanning a wide range of a ctive (ionosondes\, meteor radars\, coherent and incoherent scatter radars \, VLF transmitters) and passive (riometers\, VLF receivers\, GNSS receive rs) systems. With increased interest in understanding space weather and at mosphere coupling as a system\, polar atmospheric composition measurements of the middle atmosphere are also valuable. Finally\, citizen science dat a such as images taken by aurora chasers are increasingly used to compleme nt observations from instruments.\nCombining ground-based observations fro m various instruments enables the development of novel data analysis metho dologies that can provide access to physical quantities previously difficu lt to quantify\, such as Joule heating. Ground-based measurements are also increasingly valuable for data assimilation into numerical models\, thank s to which we can both enhance our understanding of the underlying physics of ionosphere–atmosphere processes and improve our space weather foreca sting capability.\nIn this session\, we invite contributions featuring the use of ground-based instruments in studies of the ionosphere–atmosphere system at polar and mid-latitudes. We welcome contributions of space weat her and ionospheric–atmospheric physics processes of various time and sp atial scales.\n\nSession ST4.4 – Are We Ready for the Next Extreme Spac e Weather Events? Current state-of-the-art forecasting frameworks\, knowle dge gaps\, and plans for mitigation of future severe risks\nConveners: Run gployphan Kieokaew\, Simone Di Matteo\, Judith de Patoul\, Maxime Grandin\ , Alexi Glover\n\nExtreme space weather events\, such as X-class flares an d Kp9 geomagnetic storms\, pose systemic risks to global power grids\, sat ellites\, and navigation. While historical events like the 1859 Carrington Event and recent 2024 storms provide vital data\, these "once-in-a-centur y" scenarios continue to challenge the limits of our current operational f rameworks. This session evaluates the state of the art in physics-based an d machine learning forecasting models\, aiming to bridge the gap between s cientific theory and infrastructure resilience.\n\nKey Objectives:\n\n Ev aluate the reliability and limitations of current monitoring tools.\n Ide ntify data and modeling gaps needed to improve extreme event surveillance. \n Define worst-case scenarios and their socio-economic impacts.\n Devel op concrete mitigation strategies and cross-sector communication channels. \n\nWe invite submissions from academia and industry focused on extreme im pacts within the magnetosphere\, ionosphere\, and thermosphere.\n\n(Transm is par Rungployphan Kieokaew)\nSession ST4.6 – Modelling and observation s of the near-Earth space weather environment\nConveners: Jorge Amaya\, Me lanie Heil\, Antoine Resseguier\n\nWe would like to invite all entities an d research groups working of the development of instruments and computer m odels used for the monitoring\, analysis\, and forecasting of the near Ear th environment\, to submit an abstract to this comprehensive EGU session\, presenting their latest advancements and concepts. We will highlight the unique capabilities and features of the latest instruments dedicated to mo nitoring the ionosphere\, the thermosphere\, the aurora\, and the radiatio n belts\, and their interactions. This session will also feature presentat ions on computer models that transform complex data into valuable understa nding\, enabling us to anticipate and address the challenges posed by spac e weather. Join us to be inspired by opportunities for scientific collabor ation and see how these innovations support operational monitoring for end users\, ultimately helping to safeguard our technology and society.\nSess ion ESSI1.18 – Machine Learning in Planetary Sciences and Heliophysics\n Conveners: Hannah Theresa Rüdisser\, Gautier Nguyen\, George Miloshevich\ , Valentin Tertius Bickel\n\nThe rapid growth of missions\, observatories\ , and monitoring systems in the heliosphere\, across the Solar System and from terrestrial or airborne facilities has created an unprecedented volum e and diversity of data. Making sense of these observations requires metho ds that can both process large datasets efficiently and extract meaningful physical insight. Machine learning has become an important tool in this e ffort\, complementing established physics-based approaches by enabling new ways of discovering patterns\, building predictive models\, and working w ith complex or incomplete measurements.\n\nIn recent years\, increasing at tention has been given to hybrid methods that combine machine learning wit h physical models. These approaches are now being applied across planetary and heliophysical domains\, from forecasting solar eruptions and solar wi nd conditions\, to automating the analysis of planetary surfaces or improv ing on-board data handling. They demonstrate how data-driven methods can b enefit from physical knowledge\, while physics-based models can be improve d through modern data analysis techniques.\n\nThis session aims to provide an inclusive and interdisciplinary forum for researchers applying machine learning in planetary sciences and heliophysics\, as well as those develo ping methods at the intersection between data-driven and physics-based app roaches. We particularly encourage contributions that illustrate the wide range of applications\, encourage exchange between disciplines and showcas e the transition from research to operations.\n\n(Transmis par Hannah Rüd isser) CATEGORIES:Colloques, conférences et écoles LOCATION:Vienna\, \, Autriche X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=\, Autriche;X-APPLE-RADIUS= 100;X-TITLE=Vienna:geo:0,0 END:VEVENT BEGIN:VTIMEZONE TZID:Europe/Vienna X-LIC-LOCATION:Europe/Vienna BEGIN:DAYLIGHT DTSTART:20260329T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST END:DAYLIGHT END:VTIMEZONE END:VCALENDAR