@article{4c42b0651d8945b6ac04f5064116a5f7,
title = "Nightside Detection of a Large-Scale Thermospheric Wave Generated by a Solar Eclipse",
abstract = "The generation of a large-scale wave in the upper atmosphere caused by a solar eclipse was first predicted in the 1970s, but the experimental evidence remains sparse and comprises mostly indirect observations. This study presents observations of the wind component of a large-scale thermospheric wave generated by the 21 August 2017 total solar eclipse. In contrast with previous studies, the observations are made on the nightside, after the eclipse ended. A ground-based interferometer located in northeastern Brazil is used to monitor the Doppler shift of the 630.0-nm airglow emission, providing direct measurements of the wind and temperature in the thermosphere, where eclipse effects are expected to be the largest. A disturbance is seen in the zonal and meridional wind which is at or above the 90% significance level based on the measured 30-day variability. These observations are compared with a first principles numerical model calculation from the Thermosphere-Ionosphere-Mesosphere-Electrodynamics General Circulation Model, which predicted the propagation of a large-scale wave well into the nightside. The modeled disturbance matches well the difference between the wind measurements and the 30-day median, though the measured perturbation (∼60 m/s) is larger than the prediction (38 m/s) for the meridional wind. No clear evidence for the wave is seen in the temperature data, however.",
keywords = "airglow, solar eclipse, thermosphere, thermospheric wave, thermospheric wind",
author = "Harding, {B. J.} and Drob, {D. P.} and Buriti, {R. A.} and Makela, {J. J.}",
note = "Funding Information: The Dst data used were obtained from the World Data Center for Geomagnetism in Kyoto, Japan. The Kp data used were obtained from the National Oceanic and Atmospheric Administration{\textquoteright}s National Centers for Environmental Information. Work at Illinois was supported by NSF grant AGS 14-52291. Work by D. Drob at the U.S. Naval Research Laboratory was sponsored by NASA grant NNH17AE63I. Computational resources to perform the first principles model calculations were provided by the U.S. Department of Defense (DoD) High Performance Computing Modernization Program (HPCMP). Work by R. Buriti was supported by CNPq 470589/2012-4. The authors thank UFPB for hosting the instrument. The FPI data used in this work can be found in the CEDAR Madrigal database (http://cedar.openmadrigal.org/). Funding Information: The Dst data used were obtained from the World Data Center for Geomagnetism in Kyoto, Japan. The Kp data used were obtained from the National Oceanic and Atmospheric Administration's National Centers for Environmental Information. Work at Illinois was supported by NSF grant AGS 14-52291. Work by D. Drob at the U.S. Naval Research Laboratory was sponsored by NASA grant NNH17AE63I. Computational resources to perform the first principles model calculations were provided by the U.S. Department of Defense (DoD) High Performance Computing Modernization Program (HPCMP). Work by R. Buriti was supported by CNPq 470589/2012-4. The authors thank UFPB for hosting the instrument. The FPI data used in this work can be found in the CEDAR Madrigal database (http://cedar.openmadrigal.org/). Publisher Copyright: {\textcopyright}2018. American Geophysical Union. All Rights Reserved.",
year = "2018",
month = apr,
day = "28",
doi = "10.1002/2018GL077015",
language = "English (US)",
volume = "45",
pages = "3366--3373",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "8",
}