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Type: Journal article
Title: A case study of the mesospheric 6.5-day wave observed by radar systems
Author: Jiang, G.
Xu, J.
Xiong, J.
Ma, R.
Ning, B.
Murayama, Y.
Thorsen, D.
Gurubaran, S.
Vincent, R.
Reid, I.
Franke, S.
Citation: Journal of Geophysical Research, 2008; 113(16):16111-1-16111-12
Publisher: Amer Geophysical Union
Issue Date: 2008
ISSN: 0148-0227
Statement of
G. Jiang, Jiyao Xu, J. Xiong, R. Ma, B. Ning, Y. Murayama, D. Thorsen, S. Gurubaran, R. A. Vincent, I. Reid, S. J. Franke
Abstract: In this paper, analysis of wind data detected by six ground-based radar systems located in equatorial and midlatitude belts shows that a strong mesospheric 6.5-day wave event occurred during April–May 2003. We compared the global distribution of the observed 6.5-day wave event with the theoretical wave structure (Rossby normal mode (s, n) = (1, −2)). Additionally, we investigated several important wave characteristics to understand the mesospheric 6.5-day wave event, i.e., wave period, vertical structure, relationship with background wind, propagating direction, and the zonal wave number. Our results are summarized into three points: (1) the latitudinal structure of the mesospheric 6.5-day wave during April–May 2003 is basically in agreement with the theoretical Rossby mode (s, n) = (1, −2), although the wave amplitude of zonal wind peaked at the subequatorial latitude of Northern Hemisphere but not at the theoretical place, equatorial region; (2) the main wave periods and the altitude distribution of large amplitude of this wave event varied with latitude; (3) the downward propagating wave phases indicated that this wave event originated in the lower atmosphere and propagated upward to the upper region.
Keywords: 6.5-day wave
normal mode
lower thermosphere
DOI: 10.1029/2008JD009907
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