Articles | Volume 27, issue 4
01 Apr 2009
 | 01 Apr 2009

First observation of an undular mesospheric bore in a Doppler duct

J. Fechine, C. M. Wrasse, H. Takahashi, A. F. Medeiros, P. P. Batista, B. R. Clemesha, L. M. Lima, D. Fritts, B. Laughman, M. J. Taylor, P. D. Pautet, M. G. Mlynczak, and J. M. Russell

Abstract. On 1 October 2005, during the SpreadFEx campaign, a distinct mesospheric bore was observed over São João do Cariri (7.4° S, 36.5° W), Brazil by using airglow all-sky imagers. The event appeared both in the OI5577 and OH emissions, forming a well extended wave front which was followed by short waves from behind. Simultaneous wind and temperature data obtained by the meteor radar and the TIMED/SABER satellite instrument revealed that the bore event occurred during the Doppler ducting condition in the emission layers.