HR: 0830h
AN: SA51A-0505    [PDF]
TI: Observation and Modeling of Mesospheric Frontal Events, Bores, and Nonlinear Waves
AU: * Picard, R H
EM: richard.picard@hanscom.af.mil
AF: AFRL/Space Vehicles Directorate, 29 Randolph Rd., Hanscom AFB, MA 01731-3010
AU: Taylor, M J
AF: Utah State Univ., Center for Atmospheric and Space Science and Physics Dept., Logan, UT 84321
AU: Dewan, E M
AF: AFRL/Space Vehicles Directorate, 29 Randolph Rd., Hanscom AFB, MA 01731-3010
AU: Seo, S H
AF: Utah State Univ., Center for Atmospheric and Space Science and Physics Dept., Logan, UT 84321
AU: Cohen, E
AF: Arcon Corp., 260 Bear Hill Rd.,, Waltham, MA 02451
AU: Winick, J R
AF: AFRL/Space Vehicles Directorate, 29 Randolph Rd., Hanscom AFB, MA 01731-3010
AB: We describe and categorize observations of mesospheric frontal events in OH Meinel and atomic-oxygen green-line airglows from mid- and low-latitude sites. Such extensive and long-lasting displays were first observed by Taylor and co-workers in the ALOHA-93 Campaign and attributed by Dewan and Picard to the existence of an internal-wave undular bore, a transient phase motion in a mesospheric wave duct. Prior observations of internal-wave bores had been made on ducts in the atmospheric boundary layer and the upper ocean, and such disturbances have been found to develop into solitons under certain conditions. We examine how wave ducts supporting bores can be formed by atmospheric temperature and wind structure near the mesopause and carry out calculations of the dynamics of bore propagation and of the airglow response, comparing the result of calculations to the observations.
DE: 0310 Airglow and aurora
DE: 3220 Nonlinear dynamics
DE: 3332 Mesospheric dynamics
DE: 3384 Waves and tides
SC: SPA - Aeronomy [SA]
MN: 2003 Fall Meeting