From Bow Waves to Traveling Atmospheric Disturbances: Thermospheric Perturbations Along Solar Eclipse Trajectory
Name
JGR Space Physics - 2021 - Yan - From Bow Waves to Traveling Atmospheric Disturbances Thermospheric Perturbations Along.pdf
Description
Published version
Size
1.82 MB
Format
Adobe PDF
Checksum (MD5)
d63285c2afe5e6acf1f75cc29287fed5
Author(s)
Yan, Maodong
Dang, Tong
Lei, Jiuhou
Wang, Wenbin
Zhang, Shun‐Rong
Le, Huijun
Date Issued
March 22, 2021
Journal
Journal of Geophysical Research: Space Physics
Publisher
American Geophysical Union
Citation
Yan, M., Dang, T., Lei, J., Wang, W., Zhang, S.-R., & Le, H. (2021). From bow waves to traveling atmospheric disturbances: Thermospheric perturbations along solar eclipse trajectory. Journal of Geophysical Research: Space Physics, 126, e2020JA028523.
Version
Final published version
Abstract
In this study, we investigate the characteristics of thermospheric perturbations triggered by a set of four solar eclipses, using the Thermosphere Ionosphere Electrodynamics General Circulation Model. Simulations show that temperature and horizontal wind perturbations have different wave rears but similar wavefronts, due to the coupling of energetic and dynamic processes. The perturbations are closely related to the eclipse trajectory, and their phase speed is modulated by the eclipse speed. As the eclipse shadow sweeps through the upper atmosphere, traveling atmospheric disturbances (TADs) are launched in the eclipse region and they, moving along with their moon shadow source, form bow wavefronts of thermospheric disturbances. The perturbations at a particular time are superimposed by preexisting waves and newly excited waves. With the termination of the eclipse near the sunset terminator, individual sequences are not any more organized along a specific alignment to form a bow wave. Instead, they evolve into freely propagating large‐scale TADs. The large‐scale TADs remain propagating in the direction perpendicular to the wavefronts, which is determined by history of the eclipse trajectory and thermospheric conditions. These conditions include specifically season and the latitudinal location of the eclipse trajectory.
MIT Department
Haystack Observatory
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2020ja028523
