GOLD Mission's Observation About the Geomagnetic Storm Effects on the Nighttime Equatorial Ionization Anomaly (EIA) and Equatorial Plasma Bubbles (EPB) During a Solar Minimum Equinox

The nighttime ionospheric response to a geomagnetic storm that occurred on 23–29 September 2020 is investigated over the South American, Atlantic, and West African longitude sectors using NASA's Global-scale Observations of Limb Disk measurements. On 27 solar wind conditions were favorable for prompt penetration electric fields influence equatorial ionosphere extended longitudes. ionization anomaly (EIA) crests shifted 8°–10° poleward compared quiet time monthly mean across ?65°–35°W during main phase. Ionosonde hmF2 (peak electron density height) measurements from Fortaleza (GG: 3.9°S 38.4°W) indicated stronger prereversal enhancement this evening than other nights. As result, plasma bubbles (EPB) at these longitudes evening. This first simultaneous investigation EIA morphology EPB occurrence rate an range geostationary orbit storm.