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| Format: | Recurso digital |
| Language: | English |
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2026
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| Online Access: | https://doi.org/10.5281/zenodo.19425537 |
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| _version_ | 1866901057268875264 |
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| author | Blanc, Jeremy Claude |
| author_facet | Blanc, Jeremy Claude |
| contents | <p>We analyze the temporal distribution of 4,130 Terrestrial Gamma-ray Flashes (TGFs)<br>detected by the Fermi Gamma-ray Burst Monitor (2008–2018) as a function of Local<br>Solar Time (LST). The distribution is highly non-uniform (χ² = 579.6, df = 23, p ≈<br>0). TGF occurrence peaks at 16–17h LST (pre-dusk), with a rate of 256.7 events/hour<br>at dusk (17–20h) versus 87.2 events/hour during midday (10–14h) — a ratio of 2.9×.<br>A secondary enhancement occurs at dawn (4–7h, 174.3 events/hour). This temporal<br>pattern correlates with the passage of the solar terminator, the boundary between<br>the sunlit and shadowed hemispheres. We examine concurrent data from ionospheric<br>soundings (Juliusruh foF2, 2023), geomagnetic indices (Kp, 94-year record), and tran-<br>sient luminous events (Eurosprite catalog, 2009–2013). The ionospheric electron den-<br>sity gradient (dfoF2/dt) peaks at dawn and dusk transitions. We propose that the<br>enhanced TGF rate at the solar terminator reflects a systematic variation in upper-<br>atmosphere electromagnetic permeability at the day-night boundary, and discuss im-<br>plications for future measurements of local spacetime curvature oscillations.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_19425537 |
| institution | Zenodo |
| language | eng |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Anomalous Temporal Distribution of Terrestrial Gamma- Ray Flashes: Evidence for Enhanced Upper-Atmosphere Permeability at the Solar Terminator Blanc, Jeremy Claude Terrestrial Gamma-ray Flashes TGF Fermi GBM solar terminator upper-atmosphere permeability ionospheric electron density dawn-dusk asymmetry Local Solar Time transient luminous events electromagnetic boundary geomagnetic indices day-night transition gamma radiation thunderstorm physics spacetime curvature <p>We analyze the temporal distribution of 4,130 Terrestrial Gamma-ray Flashes (TGFs)<br>detected by the Fermi Gamma-ray Burst Monitor (2008–2018) as a function of Local<br>Solar Time (LST). The distribution is highly non-uniform (χ² = 579.6, df = 23, p ≈<br>0). TGF occurrence peaks at 16–17h LST (pre-dusk), with a rate of 256.7 events/hour<br>at dusk (17–20h) versus 87.2 events/hour during midday (10–14h) — a ratio of 2.9×.<br>A secondary enhancement occurs at dawn (4–7h, 174.3 events/hour). This temporal<br>pattern correlates with the passage of the solar terminator, the boundary between<br>the sunlit and shadowed hemispheres. We examine concurrent data from ionospheric<br>soundings (Juliusruh foF2, 2023), geomagnetic indices (Kp, 94-year record), and tran-<br>sient luminous events (Eurosprite catalog, 2009–2013). The ionospheric electron den-<br>sity gradient (dfoF2/dt) peaks at dawn and dusk transitions. We propose that the<br>enhanced TGF rate at the solar terminator reflects a systematic variation in upper-<br>atmosphere electromagnetic permeability at the day-night boundary, and discuss im-<br>plications for future measurements of local spacetime curvature oscillations.</p> |
| title | Anomalous Temporal Distribution of Terrestrial Gamma- Ray Flashes: Evidence for Enhanced Upper-Atmosphere Permeability at the Solar Terminator |
| topic | Terrestrial Gamma-ray Flashes TGF Fermi GBM solar terminator upper-atmosphere permeability ionospheric electron density dawn-dusk asymmetry Local Solar Time transient luminous events electromagnetic boundary geomagnetic indices day-night transition gamma radiation thunderstorm physics spacetime curvature |
| url | https://doi.org/10.5281/zenodo.19425537 |