| Abbreviation | Definition |
|---|---|
| GGSS | Gravity Gradiometer Survey System |
| GHCN | Global Historical Climatology Network |
| GHRSST | Group for High Resolution Sea Surface Temperature |
| GI | Geographic Indication |
| GIN | Geomagnetic Information Nodes |
| GL | Ground Light |
| GLA | Geophysics Luminous Aurora-like Phenomena |
| GLA | Goddard Laboratory for Atmospheres |
| GLA1 | Auroral Pillars: Natural Searchlight Beams |
| GLA10 | Auroras Correlated with Earthquakes |
| GLA11 | Auroras Correlated with Meteors |
| GLA12 | Geophysics Luminous Aurora-like Phenomena: Close Relationship between Aurora Displays and Clouds |
| GLA13 | Geophysics Luminous Aurora-like Phenomena: Glowing Night Skies |
| GLA14 | Geophysics Luminous Aurora-like Phenomena: Transient Sky Brightenings |
| GLA15 | Geophysics Luminous Aurora-like Phenomena: Bright, Luminous Patches on the Horizon |
| GLA16 | Geophysics Luminous Aurora-like Phenomena: Weather or Storm Lights |
| GLA17 | Geophysics Luminous Aurora-like Phenomena: Curious Folklore: Auroras and Silken Threads |
| GLA18 | Correlation of Aurora Frequency with Lunar Phase |
| GLA19 | Auroras Interacting with Lunar Halos |
| GLA2 | Sky-Spanning Auroral Arches |