Observations of a large-scale gravity wave propagating over an extremely large horizontal distance in the thermosphere

• Published in: Geophysical research letters Vol. 42; no. 16; pp. 6560 - 6565
• Main Authors: Guo, Jianpeng, Forbes, Jeffrey M., Wei, Fengsi, Feng, Xueshang, Liu, Huixin, Wan, Weixing, Yang, Zhiliang, Liu, Chaoxu, Emery, Barbara A., Deng, Yue
• Format: Journal Article
• Language: English
• Published: Washington Blackwell Publishing Ltd 28.08.2015; John Wiley & Sons, Inc
• Subjects: Atmosphere; Auroral zones; Clean energy; Compressed; Detection; Dissipation; Distance; Earth; Energy; Equatorial regions; Geophysics; Gravitation; Gravitational waves; Gravity; gravity wave; Gravity wave propagation; Gravity waves; Horizontal; Inertia; Injection; Phase velocity; Propagation; Satellite tracking; Satellites; SIR; Temperature; Thermosphere; Wave propagation
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1002/2015GL065671

In this paper we report the detection of a large‐scale gravity wave propagating over an extremely large horizontal distance in the thermosphere on 28 July 2006. Specifically, after being launched at the northern auroral region on the dayside, this wave propagated equatorward with phase speeds on the order of ∼720 m/s and finally almost traveled around the Earth once horizontally in the thermosphere prior to dissipation. The time taken to dissipate is about 15.5 h. It is the farthest‐traveling large‐scale gravity wave currently tracked by satellite measurements, made possible by a sudden injection of energy in an unusually clean propagation environment. This experiment of opportunity serves as an important step in furthering our theoretical understanding of gravity wave propagation and dissipation in the thermosphere. Key Points A compressed Bz within SIR resulted in sudden high‐latitude energy injection Sudden energy injection generated gravity waves in the auroral regions A wave almost traveled around the Earth once horizontally in the thermosphere