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Constructive interference of large‐scale gravity waves excited by interplanetary shock on 29 October 2003: CHAMP observation
Author(s) -
Guo Jianpeng,
Liu Huixin,
Feng Xueshang,
Wan Weixing,
Deng Yue,
Liu Chaoxu
Publication year - 2014
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2014ja020255
Subject(s) - physics , interplanetary spaceflight , gravitational wave , excited state , shock wave , scale (ratio) , interference (communication) , geophysics , shock (circulatory) , astrophysics , mechanics , nuclear physics , engineering , plasma , electrical engineering , solar wind , quantum mechanics , medicine , channel (broadcasting)
In this paper we report the detection of full constructive interference between two large‐scale gravity waves in the upper thermosphere from the CHAMP accelerometer measurements. The two waves are separately excited in northern and southern auroral regions by the shock‐induced auroral intensification on 29 October 2003. They propagate equatorward and encounter near the equator, where constructive interference occurs and causes nightside equatorial neutral density enhancements of ∼60%. This result demonstrates that the constructive interference can be a potential mechanism for large density increases in the equatorial region during magnetically active periods.