The deadline to submit a session, town hall, or pre-conference workshop proposal for AGU25 has passed. Please search for and review proposed sessions below. Please note this site is frozen as of 4/29/25 and will not reflect any changes to proposals made after this date.


Conveners will be contacted by the AGU25 Program Committee with any requests for mergers or edits to proposals. Conveners will be notified of the acceptance of their proposal in mid-June.


Abstract submissions will also open in mid-June and the deadline for abstract submissions is 30 July, 2025.


Please visit the AGU25 website for more information or please contact AGU with any questions.

Session Proposal: Solar Energetic Particles in the Inner Heliosphere and Beyond (AGU25)

SH026
Solar Energetic Particles in the Inner Heliosphere and Beyond

Session ID#: 249612

Session Description:
Solar energetic particles (SEPs) accelerated both at the Sun and in interplanetary space are an excellent observational tool to study the fundamental physics governing particle acceleration and transport in space plasmas. SEPs are typically energized in the corona within magnetic reconnection sites and at shocks driven by coronal mass ejections. Beyond the Sun, solar wind stream interaction regions create interplanetary shocks enabling further acceleration. The many sources, acceleration mechanisms, and transport processes, combine to form a complex energetic particle environment that is not entirely understood. As the Sun continues its peak activity, it provides excellent opportunities to study the spatiotemporal evolution of SEPs with multiple dedicated heliospheric observatories. Furthermore, new observations close to the Sun can challenge the current state of SEP theory and further advancements are necessary. This session welcomes presentations related to theoretical and observational investigations of SEPs from all sources spanning the full characteristic energy ranges.
Index Terms:

7513 Coronal mass ejections [SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY]
7514 Energetic particles [SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY]
7519 Flares [SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY]
7526 Magnetic reconnection [SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY]
Primary Convener:  Samuel Hart, Southwest Research Institute, San Antonio, TX, United States
Conveners:  Athanasios Kouloumvakos, The Johns Hopkins University. Applied Physics Laboratory, Laurel, United States, Rachael Jo Filwett, Montana State University, Bozeman, MT, United States and Lulu Zhao, University of Michigan, Climate and Space Sciences and Engineering, Ann Arbor, United States
Student/Early Career Convener:  Gabriel Domingo Muro, California Institute of Technology, Pasadena, United States
 
Probing SEP Acceleration and Transport with Uncoupled EPREM (1868022)
Matthew Young, University of New Hampshire Main Campus, Durham, NH, United States and Bala Poduval, Space Science Institute, Boulder, CO, United States
 
The Role of Stochastic Acceleration and Alfvén Turbulence in SEP Dynamics (1869336)
Valeriy Tenishev, NASA Marshall Space Flight Center, Huntsville, United States, Yinsi Shou, Univ. of Michigan, Ann Arbor, MI, United States and Jakobus Albertus le Roux, The University of Alabama in Huntsville, Huntsville, AL, USA, Department of Space Science, Huntsville, United States
 
Characterizing Bidirectional Solar Energetic Electron Events Near 1 AU (1881761)
Lucas Liuzzo, Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA, United States, Andrew R Poppe, Space Sciences Laboratory, University of California at Berkeley, Berkeley, United States, Wenwen Wei, Space Sciences Lab, UC Berkeley, Berkeley, United States, Christina O Lee, University of California Berkeley, Space Sciences Laboratory, Berkeley, United States and Vassilis Angelopoulos, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States
 
Multi-spacecraft observations of solar energetic particle events with inverse velocity arrival (IVA) features: PSP and SolO (Invited) (1882344)
Zigong Xu1, Christina Cohen2, Gabriel Domingo Muro2, Alan C Cummings3, Richard A Leske2, Eric R Christian4, David J McComas5, Mark E Wiedenbeck6, Nathan Schwadron7, Ralph L McNutt Jr8, Grant Berland9, Robert F Wimmer-Schweingruber10, Zheyi Ding11, George C Ho12, Robert Colby Allen13, Athanasios Kouloumvakos14, David Lario15 and Joe Giacalone16, (1)California Institute of Technology, Pasadena, CA, United States, (2)Caltech, Pasadena, United States, (3)CALTECH, Pasadena, CA, United States, (4)NASA GSFC, Greenbelt, MD, United States, (5)Princeton University, Department of Astrophysical Sciences, Princeton, United States, (6)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States, (7)Princeton University, Princeton, United States, (8)Johns Hopkins University Applied Physics Laboratory, Space Exploration Sector, Laurel, MD, United States, (9)Applied Physics Laboratory Johns Hopkins, Laurel, United States, (10)University of Kiel, Institute for Experimental and Applied Physics, Kiel, Germany, (11)University of Kiel, Institute of Experimental and Applied Physics, Kiel, Germany, (12)southwest Research Institute, San Antonio, United States, (13)Southwest Research Institute, San Antonio, United States, (14)The Johns Hopkins University. Applied Physics Laboratory, Laurel, United States, (15)Goddard Space Flight Center, Greenbelt, United States, (16)University of Arizona, Planetary Sciences, Tucson, AZ, United States
 
Observations and Modeling of Inverse Velocity Dispersion in SEP Events (Invited) (1886077)
Zheyi Ding1, Robert F Wimmer-Schweingruber1, Robert Colby Allen2, Alexander Kollhoff1, Patrick Kühl3, Liu Yang1, Lars Berger1, Athanasios Kouloumvakos4, Nicolas Wijsen5, Yucong Li6, Jingnan Guo7, Deniel Pacheco8, Manuela Temmer9, George C Ho10, Glenn M Mason11, Zigong Xu12 and Sindhuja Gunaseelan13, (1)University of Kiel, Institute for Experimental and Applied Physics, Kiel, Germany, (2)Southwest Research Institute, San Antonio, United States, (3)Christian Albrechts Universität Kiel, Kiel, Germany, (4)The Johns Hopkins University. Applied Physics Laboratory, Laurel, United States, (5)KU Leuven, Leuven, Belgium, (6)NSSC National Space Science Center, CAS, Beijing, China, (7)University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China, (8)University of Science and Technology of China, Hefei, China, (9)University of Graz, Institute of Physics, Graz, Austria, (10)southwest Research Institute, San Antonio, United States, (11)Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, (12)California Institute of Technology, Pasadena, CA, United States, (13)Catholic University of America, Washington, United States
 
Comparative Analysis of 10 - 50 MeV Solar Proton Events at Lagrange Point 1 and the Geostationary Orbit (1895912)
Aatiya Ali, Georgia State University, Physics & Astronomy, Atlanta, United States and Viacheslav M Sadykov, Georgia State University, Atlanta, GA, United States
 
The Suprathermal Spectrum in the Inner Heliosphere - Importance to Space Weather and Latest Observations (Invited) (1896677)
Maher A Dayeh, Southwest Research Institute, San Antonio, TX, United States and in collaboration with the PSP/ISOIS team and SolO/SIS team
 
Investigating the Longitudinal Asymmetry in SEP Detection: ACE vs. STEREO-A during the November 12, 2023 CME Event (1902911)
Adolfo Santa Fe Dueñas1, Noé Lugaz1, Bin Zhuang2, Nada A Al-Haddad1, Yakub Olufadi3 and Sahanaj Banu1, (1)University of New Hampshire, Durham, United States, (2)Space Science Center, UNH, Durham, United States, (3)University of New Hampshire Main Campus, Durham, United States
 
Properties of Energetic Particles in the Sub-Alfvénic Solar Wind Flow observed by Parker Solar Probe (1904403)
Prachi Pathare1, Mihir Desai1, Maher Dayeh1, Michael joseph Starkey2, Samuel Hart1 and ISOIS Science Team, (1)Southwest Research Institute, San Antonio, United States, (2)Southwest Research Institute, Physics and Astronomy, San Antonio, United States
 
The Intense Multi-Spacecraft SEP event on 2024 May 20 as a Test of the Main Mechanisms Distributing SEPs in the Inner Heliosphere (1909797)
David Lario1, Ian G Richardson2, Junxiang Hu3, Laura Balmaceda4, Ryun Young Kwon5, Samantha Wallace6, Daniel da Silva1, M. Leila Mays7, Vratislav Krupar8, Alexander Warmuth9, Fernando Carcaboso10, Leng Ying Khoo11, Christina O Lee12, Clementina Sasso13, Patrick Kühl14, Robert F Wimmer-Schweingruber15, Esa Riihonen16, Rami O Vainio16, Antonio Niemela17, Jaye Verniero18, Evangelos Paouris19, Charles Nickolos Arge1, Angels Aran20, Timothy Simon Horbury21, David Berghmans22 and Milan Maksimovic23, (1)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (2)University of Maryland College Park, NASA Goddard Space Flight Center, Greenbelt, United States, (3)NASA Goddard Space Flight Center, Code 671, Greenbelt, United States, (4)George Mason University, Fairfax, United States, (5)Korea Astronomy and Space Science Institute, Daejeon, South Korea, (6)Embry-Riddle Aeronautical University, Daytona Beach, FL, United States, (7)NASA Goddard Space Flight Center, Community Coordinated Modeling Center, Greenbelt, United States, (8)NASA/GSFC & UMBC/GPHI, Greenbelt, United States, (9)Leibniz Institute for Astrophysics Potsdam, Potsdam, Germany, (10)NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, United States, (11)University of Colorado Boulder, Boulder, United States, (12)University of California Berkeley, Space Sciences Laboratory, Berkeley, United States, (13)INAF - Osservatorio Astronomico di Capodimonte, Napoli, Italy, (14)Christian Albrechts Universität Kiel, Kiel, Germany, (15)University of Kiel, Institute for Experimental and Applied Physics, Kiel, Germany, (16)University of Turku, Turku, Finland, (17)NASA GSFC / UMBC, Greenbelt, United States, (18)NASA/GSFC, Greenbelt, United States, (19)Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, (20)Universitat de Barcelona (UB-IEEC), Departament Física Quàntica i Astrofísica, Institut de Ciències del Cosmos (ICCUB), Barcelona, Spain, (21)Imperial College London, Department of Physics, London, SW7, United Kingdom, (22)Royal Observatory of Belgium, Brussels, Belgium, (23)LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, Meudon, France
 
Multipoint Observations of Solar Energetic Particle Transport During December 05-10, 2024 Events (1916211)
Fernando Carcaboso1, Leng Ying Khoo2, David Lario3, Raul Gomez-Herrero4, Francisco Espinosa Lara4, Ignacio Cernuda5, Dr. Erika Palmerio6, Daniel Pacheco7, Beatriz Sanchez-Cano8, Gabriel Martin9, Christina O Lee10, Adam Szabo11, Benjamin J Lynch12, Wenwen Wei13 and Robert Colby Allen14, (1)NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, United States, (2)University of Colorado Boulder, Boulder, United States, (3)Goddard Space Flight Center, Greenbelt, United States, (4)University of Alcala, Space Research Group, Alcala de Henares, Spain, (5)University of Alcala, Alcala de Henares, Spain, (6)Predictive Science Inc., San Diego, CA, United States, (7)Universitat de Barcelona, Barcelona, Spain, (8)University of Leicester, Leicester, LE1, United Kingdom, (9)University of Alcalá, Physics and Mathematics, Alcala de Henares, Spain, (10)University of California Berkeley, Space Sciences Laboratory, Berkeley, United States, (11)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (12)University of California Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, (13)Space Sciences Lab, UC Berkeley, Berkeley, United States, (14)Southwest Research Institute, San Antonio, United States
 
Building a solar energetic particle event catalog for Mars (1917585)
Rebecca Jolitz1, Christina O Lee1, Robert J Lillis2, Patrick Dunn1, Ali Rahmati1, Davin E Larson3 and Shannon Curry4, (1)University of California Berkeley, Space Sciences Laboratory, Berkeley, United States, (2)Space Sciences Laboratory, University of California Berkeley, Berkeley, United States, (3)Space Sciences Laboratory, Berkeley, United States, (4)University of Colorado Boulder, Laboratory for Atmospheric and Space Physics, Boulder, United States
 
Modeling and Data Analysis of the Solar Energetic Particles during the May 2024 Geostorm Event (1921489)
Wenwen Wei1, Christina O Lee2, Janet G Luhmann1 and M. Leila Mays3, (1)University of California Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, (2)University of California Berkeley, Space Sciences Laboratory, Berkeley, United States, (3)NASA Goddard Space Flight Center, Community Coordinated Modeling Center, Greenbelt, United States
 
May 2024 Solar Energetic Particle Storms: Peculiarities and Predictability (1925768)
Emily Burns-Kaurin1, Viacheslav M Sadykov1, Aatiya Ali2 and Griffin Goodwin1, (1)Georgia State University, Physics & Astronomy, Atlanta, GA, United States, (2)Georgia State University, Physics & Astronomy, Atlanta, United States
 
The Effect of Drifts and Heliospheric Current Sheet on Solar Energetic Particles Anisotropy and Asymptotic direction in the Magnetosphere (1927415)
Ashraf Moradi, University of Arizona, Tucson, AZ, United States and Joe Giacalone, University of Arizona, Planetary Sciences, Tucson, AZ, United States
 
A catalogue of high-energy proton and electron events from STEREO (1929931)
Evangelos Paouris, Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, Athanasios Kouloumvakos, The Johns Hopkins University. Applied Physics Laboratory, Laurel, United States, Ian G Richardson, University of Maryland College Park, NASA Goddard Space Flight Center, Greenbelt, United States, David Lario, Goddard Space Flight Center, Greenbelt, United States, Angelos Vourlidas, Johns Hopkins University Applied Physics Laboratory, Laurel, United States and Athanasios Papaioannou, National Observatory of Athens, Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, Athens, Greece
 
Production of Very High Energy Electrons at a Strong Interplanetary Shock (1945498)
Domenico Trotta, European Space Agency, European Space Astronomy Center (ESA), Villanueva De La Canada, Spain, Yuri V Khotyaintsev, Swedish Institute of Space Physics (IRF), Uppsala, Sweden, Takanobu Amano, University of Tokyo, Graduate School of Science, Bunkyo-ku, Japan, Andrew P Dimmock, IRF, Uppsala, Sweden, Stuart Bale, University of California, Berkeley, Berkeley, CA, United States, Robert F Wimmer-Schweingruber, University of Kiel, Institute for Experimental and Applied Physics, Kiel, Germany, Antonio Vecchio, Paris Observatory Meudon, Meudon, France, Milan Maksimovic, LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, Meudon, France, David Pisa, University of Iowa, Iowa City, United States, Georgios Nicolaou, University College London, Mullard Space Science Laboratory, London, United Kingdom, Christopher John Owen, UCL, Mullard Space Science Laboratory, Dorking, United Kingdom, Nina Dresing, University of Turku, Department of Physics and Astronomy, Turku, Finland, Annamaria Fedeli, University of Turku, Turku, Finland, Francesco Valentini, University della Calabria, Rende, Italy, Andrea Larosa, Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, Orléans Cedex 2, France and Timothy Simon Horbury, Imperial College London, Department of Physics, London, SW7, United Kingdom
 
From Sun to Mars: Investigating the Large Multi-spacecraft SEP on 9 October 2024 SEP Event with EUHFORIA and PARADISE (1948165)
Antonio Niemela, NASA GSFC / UMBC, Greenbelt, United States, David Lario, Goddard Space Flight Center, Greenbelt, United States and Nicolas Wijsen, KU Leuven, Leuven, Belgium
 
Delayed Maximum Energy Solar Energetic Particle Events: Statistical Analysis from Solar Orbiter (1964873)
Robert Colby Allen, Southwest Research Institute, San Antonio, TX, United States, George C Ho, southwest Research Institute, San Antonio, United States, Glenn M Mason, Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, Zheyi Ding, University of Kiel, Institute of Experimental and Applied Physics, Kiel, Germany, Malik Walker, Johns Hopkins University, Physics and Astronomy, Baltimore, MD, United States, Athanasios Kouloumvakos, The Johns Hopkins University. Applied Physics Laboratory, Laurel, United States, Robert F Wimmer-Schweingruber, University of Kiel, Institute for Experimental and Applied Physics, Kiel, Germany, Javier Rodriguez-Pacheco, University of Alcalá, Space Research Group, Alcalá de Henares, Spain, Sarah K. Vines, Southwest Research Institute, Space Science Division, San Antonio, United States, Samuel Hart, Southwest Research Institute, San Antonio, United States, Rachael Jo Filwett, Montana State University, Bozeman, MT, United States, Zigong Xu, California Institute of Technology, Pasadena, CA, United States and Christina Cohen, Caltech, Pasadena, United States
 
Radial Dependency of ICME-associated Particle Acceleration Processes: Statistical Multipoint Observations from 2016-2023 (1966471)
Malik Walker, Johns Hopkins University, Physics and Astronomy, Baltimore, MD, United States, Robert Colby Allen, Southwest Research Institute, San Antonio, United States, George C Ho, southwest Research Institute, San Antonio, United States, Glenn M Mason, Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, Christina Cohen, Caltech, Pasadena, United States and Christina O Lee, University of California Berkeley, Space Sciences Laboratory, Berkeley, United States
 
Tracing the Origin of Compositional Changes in Helium-3 Rich Events (1972893)
Mariana Jeunon1,2, Sophie Musset3, Georgia Adair de Nolfo2, Eric R Christian4 and J. Grant Mitchell5, (1)Catholic University of America, Washington, DC, United States, (2)NASA Goddard Space Flight Center, Greenbelt, United States, (3)Applied Physics Laboratory Johns Hopkins, Laurel, United States, (4)NASA GSFC, Greenbelt, MD, United States, (5)NASA Goddard Space Flight Center, Greenbelt, MD, United States
 
Turbulence "Pressure Cooker" and Energization of Suprathermal Particles: IMAP, L1 Constellation, PSP and SO (1973707)
Prof. William H Matthaeus1, Riddhi Bandyopadhyay1, Michael A. Shay1, Francesco Pecora2, Rohit Chhiber1, Mr. Subash Adhikari, PhD3 and Yan Yang1, (1)University of Delaware, Department of Physics and Astronomy, Newark, United States, (2)University of Delaware, Newark, United States, (3)University of Delaware, Department of Physics and Astronomy, Newark, DE, United States
 
Relative Abundances and Relative Timing of Extreme Solar Energetic Particle Events (1982119)
Abdullah Shmies1, Maher Dayeh2, Radoslav Bucik2 and Samuel Hart2, (1)University of Texas at San Antonio, San Antonio, United States, (2)Southwest Research Institute, San Antonio, United States
 
Origin of the Unusual Heavy‑Ion Composition in 3He‑Rich Solar Energetic Particles (1989668)
Radoslav Bucik1, Glenn M Mason2, Sargam Mulay3, George C Ho1, Robert F Wimmer-Schweingruber4 and Javier Rodriguez-Pacheco5, (1)Southwest Research Institute, San Antonio, TX, United States, (2)Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, (3)School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom, (4)University of Kiel, Institute for Experimental and Applied Physics, Kiel, Germany, (5)University of Alcalá, Space Research Group, Alcalá de Henares, Spain
 
The May 2024 Superstorm Coronal Mass Ejections as Observed by the Psyche Gamma-Ray and Neutron Spectrometer (1992197)
Madison Liebel, Laboratory for Atmospheric and Space Physics, Boulder, United States, Patrick N Peplowski, Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States and David J Lawrence, Johns Hopkins University, Baltimore, MD, United States
 
Comprehensive Analysis of the 2022 March 28 3He-rich Solar Energetic Particle Event (1998731)
Monica Laurenza1, Mirko Stumpo2, Simone Benella2, Anna Milillo3, Christina Plainaki4, Matthew John West5, Pietro Zucca6, Stanislav V Barabash7, Daniel Heyner8, Ali Varsani9,10, Go Murakami11 and SERENA TEAM: S. Narendranath, A. Aronica, H. U. Auster, L. Biasiotti, A. Brin, L. Colasanti, D. Constantinescu, E. De Angelis, P.P. Di Bartolomeo, D. Fischer, S. Ivanovski, H. Jeszenszky, A. Kazakov, (1)IAPS-INAF, Rome, Italy, (2)IAPS-INAF (VAT number: IT06895721006), Rome, Italy, (3)INAF-IAPS, Rome, Italy, (4)ASI, Rome, Italy, (5)European Space Agency, Noordwijk, Netherlands, (6)ASTRON, Dwingeloo, Netherlands, (7)Swedish Inst Space Physics, Kiruna, Sweden, (8)TU Braunschweig, Braunschweig, Germany, (9)University College London, London, United Kingdom, (10)Austrian Academy of Sciences, Space Research Institute, Graz, Austria, (11)ISAS-JAXA, Sagamihara, Japan
 
EPREM Simulations of 29th November 2020 Widespread SEP Event (2001096)
Bala Poduval, University of New Hampshire Main Campus, Durham, NH, United States and Matt Young, University of New Hampshire, Durham, United States