Mesosphere and Lower Thermosphere changes associated with the July 2, 2019 total Eclipse in South America over the Andes Lidar Observatory, Cerro Pachon, Chile.

This article presents the results of a week observations around 2 July 2019, total Chilean eclipse. The eclipse occurred between 19:22 and 21:46 UTC, with complete sun disc obscuration at 20:38–20:40 UTC (16:38–16:40 LT) over Andes Lidar Observatory (ALO) (30.3°S, 70.7°W). Observations were carried out using ALO instrumentation goal to observe possible eclipse-induced effects on mesosphere lower thermosphere region (MLT; 75–105 km altitude). To complement our data set, we have also utilized TIMED/SABER temperatures ionosonde electron density measurements taken University La Serena's Juan Soldado Observatory. Observed events include an unusual fast, bow-shaped gravity wave structure in airglow images, temperature mapper brightness as well lidar 150 horizontal wavelength 24 min observed period, vertical 25 km. Also, strong zonal wind shear above 100 meteor radar scans occurrence sporadic E layer from measurements. Finally, variations presence descending sodium near 98 seen data. We discuss MLT, which can shed light sparse set during this type event. Our point several eclipse-associated changes atmosphere below but not directly within MLT.