Unusual Circumstances of the 2024 June 8 GLE
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866915796218806272 |
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| author | Gopalswamy, Nat Makela, Pertti Xie, Hong Akiyama, Sachiko Yashiro, Seiji Mohan, Atul |
| author_facet | Gopalswamy, Nat Makela, Pertti Xie, Hong Akiyama, Sachiko Yashiro, Seiji Mohan, Atul |
| contents | Ground Level Enhancement (GLE) in large solar energetic particle (SEP) events is indicative of protons accelerated to GeV energies. Almost all GLE events are associated with sustained gamma-ray emission (SGRE) from the Sun because the latter require >300 MeV protons that are readily present during GLEs. Here we report on the 2024 June 8 GLE event, which has the distinction of not being associated with an SGRE event. All the associated phenomena typical of SGRE events were present: a fast and wide CME, a major solar flare, and an intense type II radio bursts that extend from the metric to kilometric wavelength domains. There was a data gap of ~51 min, but the SGRE is expected to last for hours. We suggest the east-west asymmetry in the flow of energetic particles from the shock is likely to be the reason for the lack of SGRE emission. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_12507 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Unusual Circumstances of the 2024 June 8 GLE Gopalswamy, Nat Makela, Pertti Xie, Hong Akiyama, Sachiko Yashiro, Seiji Mohan, Atul Solar and Stellar Astrophysics Ground Level Enhancement (GLE) in large solar energetic particle (SEP) events is indicative of protons accelerated to GeV energies. Almost all GLE events are associated with sustained gamma-ray emission (SGRE) from the Sun because the latter require >300 MeV protons that are readily present during GLEs. Here we report on the 2024 June 8 GLE event, which has the distinction of not being associated with an SGRE event. All the associated phenomena typical of SGRE events were present: a fast and wide CME, a major solar flare, and an intense type II radio bursts that extend from the metric to kilometric wavelength domains. There was a data gap of ~51 min, but the SGRE is expected to last for hours. We suggest the east-west asymmetry in the flow of energetic particles from the shock is likely to be the reason for the lack of SGRE emission. |
| title | Unusual Circumstances of the 2024 June 8 GLE |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2602.12507 |