HR: 0800h
AN: SA31A-1125    [Abstracts]
TI: Investigation of a `Wall' Wave Event Using Airglow and Na Wind/Temperature Lidar Measurements
AU: * Li, F
EM: fengli@uiuc.edu
AF: Department of Atmospheric Sciences, University of Illinois, 1308 W Main, Urbana, IL 61801 United States
AU: Liu, A
EM: liuzr@uiuc.edu
AF: Department of Electrical and Computer Engineering, University of Illinois, 1308 W Main, Urbana, IL 61801 United States
AU: Swenson, G
EM: swenson1@uiuc.edu
AF: Department of Electrical and Computer Engineering, University of Illinois, 1308 W Main, Urbana, IL 61801 United States
AU: Franke, S
EM: s-franke@uiuc.edu
AF: Department of Electrical and Computer Engineering, University of Illinois, 1308 W Main, Urbana, IL 61801 United States
AU: Hecht, J
EM: james.hecht@aero.org
AF: Space Sciences Application Laboratory, The Aerospace Corporation, M2-259, PO Box 92957, Los Angels, CA 90009 United States
AU: Taylor, M
EM: mtaylor@cc.usu.edu
AF: Physics Department, Utah State University, 4415 Old Main Hill, Logan, UT 84322 United States
AU: Zhao, Y
EM: yucheng@cc.usu.edu
AF: Physics Department, Utah State University, 4415 Old Main Hill, Logan, UT 84322 United States
AB: A `wall' wave was observed on August 12, 2004 at Maui, HI ($20.7\deg$N, $156.3\deg$W) by an all-sky OH airglow imager. The `wall' wave emerged from the SW horizon at $\sim$ 0800 UT. It propagated toward the NE, passed the zenith at $\sim$ 0900 UT, and disappeared at $\sim$ 1200 UT. The brightness of the OH airglow in the whole sky increased by about 100% during the passage of the `wall' wave. Small-scale high-frequency gravity waves were observed to be phase-locked with the `wall' wave. The dynamical effects of the `wall' wave are investigated using simultaneous temperature and wind measurements made by a Na lidar system, and wind observations made with a meteor radar. It is found the sharp increase of the zenith airglow intensity is accompanied by a rapid increase of temperature of $\sim$ 60 K in 30 min in the 90-95 km range. The tidal structures in the horizontal winds were significantly changed during the time the `wall' wave was observed. The phases of the diurnal tidal winds were lagged by 4-5 hours comparing with the day before (August 11, 2004). The underlying mechanisms for these observed features are explored.
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3384 Waves and tides
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting