Solar Physics High Energy Research Workshop 2025
August 12–15, 2025 | Berkeley, California

The SPHERE-4 Workshop 2025 will be hosted by the Space Sciences Laboratory (SSL) at the University of California, Berkeley—home to a long and proud tradition of advancing high-energy solar physics.

This meeting continues the legacy of the RHESSI workshop series, bringing together researchers from across the globe to foster a unified understanding of energetic solar phenomena through coordinated observations, theory, and modeling. We aim to build bridges between new and upcoming instruments sensitive to high-energy phenomena and the state of the art simulations crucial for interpretation of observations. We will highlight current observatories (e.g. STIX, EOVSA, PADRE), and discuss the development of next-generation missions.

SSL was the host of the First General RHESSI Workshop in October 2002, the RHESSI Data Analysis Workshop in 2004, RHESSI-NESSIE V in 2006, and the Bob Lin Memorial Symposium in 2013. In 2025, we’re excited to welcome our colleagues back to Berkeley for another inspiring and collaborative gathering.


We highly encourage in-person attendance, however, if you are unable to travel, please contact us (sphere2025@ssl.berkeley.edu) and we will try to accommodate you online for the plenary oral sessions. The meeting will feature:

  • Plenary sessions focused on topical discussions
  • Breakout sessions for special topics
  • A dedicated poster session
  • Strong support and visibility for early-career researchers

Abstract Submission Deadline: June 25

Registration Deadline: August 5

More details on registration and abstract submission, travel information, and the science program can be found at the menu tabs at the top of the page.

Please review the Meeting Code of Conduct, which applies to all participants.

Let’s come together again where it all began—to look ahead, flare forward, and spark new discoveries.

🌟 Special Thanks to Our Supporters of Early Career Scientists

We are deeply grateful for the generous support that has made it possible for early career scientists to join SPHERE 2025 and share their research with the international solar physics community.

This year, travel funding for early career participants has been made possible through two key programs:

  • The Solar Flare Energy Release (SolFER) Collaboration – Early Career Program, led by Dr. James F. Drake(University of Maryland), whose commitment to fostering the next generation of scientists has been instrumental in enabling their active participation in SPHERE 2025.
  • A NASA grant to support early career scientists’ participation in research-boosting conferences, coordinated by Dr. Juan Carlos Martínez Oliveros (University of California, Berkeley), which has helped broaden opportunities for young researchers to present their work and build valuable collaborations.

Their vision and support are helping ensure that the future of solar physics is bright, inclusive, and full of discovery.

Questions? Feel free to contact the local organizing committee at sphere2025@ssl.berkeley.edu

Workshop hosted by the Space Sciences Laboratory, UC Berkeley
Website maintained by SSL