AGU report

Nicholas Larsen digitally attended the 2025 AGU “American Geophysical Union” conference that was hosted in New Orleans, Louisiana, USA. This was held from December 15th to 19th, 2025. He was a participant in two sessions at the conference, these being the “SH23E: The Future of the International Sunspot Number” and “SH21F: Monitoring and Forecasting Space and Terrestrial Weather with Ground-Based Measurements of Cosmic Rays” sessions, both being poster sessions. In SH23E he presented ongoing work with Professor Hisashi Hayakawa into re-evaluating the potential depth of the Maunder minimum using updated sunspot number data (Assessment for the depth of the Maunder Minimum: A status report). In SH21F he presented the current status of my, still developing, open source geomagnetic cut-off rigidity program (OTSOpy: Streamlining Geomagnetic Cut-Off Calculations with a Python Package). Both of these projects are important to the goals of the TranSEHA program, the former a re-evaluation of a widely known historical using new data, and the latter being a package that can dramatically improve statistical analysis of measurements taken by historical ground based space weather monitoring systems.

Abstracts for both digital posters presented can be found at: https://agu.confex.com/agu/agu25/meetingapp.cgi/Person/2113643