Oct 27 – 31, 2025
Europe/Stockholm timezone

Solar Energetic Particles in Solar Cycle 25: Observations and Comparisons with Previous Cycles

Oct 27, 2025, 1:30 PM
15m
Idun

Idun

Oral SWR2 - Interdisciplinary Insights into Space Weather Events of Solar Cycle 25: From Solar Origins to Planetary Impacts SWR2 – Interdisciplinary Insights into Space Weather Events of Solar Cycle 25: From Solar Origins to Planetary Impacts

Speaker

George Ho (Southwest Research Institute)

Description

As Solar Cycle 25 reaches its peak of activity, Solar Orbiter is observing a substantial increase in solar flares, coronal mass ejections (CMEs), and solar energetic particles (SEPs). Specifically, the Energetic Particle Detector (EPD) on board Solar Orbiter has been tracking and characterizing the rise in SEP activity over the past five years. This paper focuses on the intensities of suprathermal and energetic particles from 2020 through 2025. Both electrons, ions, and 3He particles show a notable increase, which aligns closely with other solar phenomena. We compare the SEP flux observed during this cycle with the measurements from Cycles 23 and 24, as recorded by ACE. The results reveal that the flux levels in Cycle 25 are significantly higher than those of Cycle 24, and comparable to those observed during Cycle 23. This surge in solar activity is filling the heliosphere with high-energy SEP particles, which are influencing the entire solar system, including Earth.

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Primary author

George Ho (Southwest Research Institute)

Co-authors

Dr Athanasios Kouloumvakos (Johns Hopkins Applied Physics Laboratory) Prof. Glenn Mason (Johns Hopkins Applied Physics Laboratory) Prof. Javier Rodríguez-Pacheco (University of Alcala) Prof. Raúl Gómez-Herrero (University of Alcala) Dr Robert Allen (Southwest Research Institute) Prof. Robert Wimmer-Schweingruber (University of Kiel)

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