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Observations of a large‐scale gravity wave propagating over an extremely large horizontal distance in the thermosphere
Author(s) -
Guo Jianpeng,
Forbes Jeffrey M.,
Wei Fengsi,
Feng Xueshang,
Liu Huixin,
Wan Weixing,
Yang Zhiliang,
Liu Chaoxu,
Emery Barbara A.,
Deng Yue
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl065671
Subject(s) - thermosphere , dissipation , gravity wave , gravitational wave , geophysics , physics , wave propagation , scale (ratio) , satellite , ionosphere , phase velocity , geodesy , geology , atmospheric sciences , optics , astrophysics , astronomy , thermodynamics , quantum mechanics
Abstract 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.