Ion Acceleration in Fermi-LAT Behind-the-Limb Solar Flares: The Role of Coronal Shock Waves

Warmuth, Alexander; Pesce-Rollins, Melissa; Omodei, Nicola; Tan, Song

doi:10.1007/s11207-025-02522-z

Ion Acceleration in Fermi-LAT Behind-the-Limb Solar Flares: The Role of Coronal Shock Waves

Journal Article · Tue Aug 19 00:00:00 EDT 2025 · Solar Physics

DOI:https://doi.org/10.1007/s11207-025-02522-z· OSTI ID:2587706

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Leibniz Institute for Astrophysics Potsdam (AIP), Potsdam (Germany)
National Institute of Nuclear Physics (INFN), Pisa (Italy)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States).; Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics & Cosmology
Leibniz Institute for Astrophysics Potsdam (AIP), Potsdam (Germany); Univ. of Potsdam (Germany)

Here, we investigate the relationship between the gamma-ray emission measured with Fermi-LAT and radio signatures of coronal shock waves in four behind-the-limb (BTL) solar flares. All events were associated with metric type II radio burst. Both start and end times of the radio bursts were synchronized with the gamma-ray emission. The type II bursts associated with the BTL gamma-ray flares had higher speeds and lower formation heights than those of an average sample. These findings support the notion that the highly relativistic ions that produce the gamma-rays in BTL flares are accelerated at CME-driven propagating coronal shock waves rather than in large-scale coronal loops.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); German Space Agency (GSA); European Union (EU)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2587706

Journal Information:: Solar Physics, Journal Name: Solar Physics Journal Issue: 8 Vol. 300; ISSN 1573-093X; ISSN 0038-0938

Publisher:: Springer Science and Business Media LLCCopyright Statement

Country of Publication:: United States

Language:: English

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