Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa24a..07m&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA24A-07
Physics
0310 Airglow And Aurora, 0342 Middle Atmosphere: Energy Deposition (3334), 3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3394 Instruments And Techniques
Scientific paper
Mesospheric bores are remarkable gravity wave events that are characterized by a sharp leading front usually followed by a coherent train of waves that grow in number with time. To date, there have been only a few reports of such events in the literature. However, recent analysis of mesospheric airglow image data from at São João do Cariri, Brazil, and from Bear Lake Observatory, Utah, USA have revealed a relatively large number of bore-like (typically 25-50 events per year). This paper focuses on a detailed comparison of these two data sets which were obtained from two well-separated sites at equatorial and mid-latitudes under differing mesospheric conditions. At São João do Cariri (7°S, 36°W) all-sky CCD image measurements of gravity waves in the near infrared OH Meinel, O2 (0,1) bands, and the OI (557.7 nm) line nightglow emissions were made over a two- year period from September 2000 to September 2002. At Bear Lake Observatory (41.6°N, 111.6°W) all-sky measurements of mesospheric gravity waves in the same three nightglow emissions were obtained over a 2-year period from January 2002 to December 2003. These two data sets have been investigated to determine the occurrence and typical properties of undular mesospheric bore events as observed at equatorial and mid-latitudes. In this paper we will describe their main characteristics and contrast their differing properties.
Buriti Ricardo A.
Fechine J. A.
Medeiros A. F.
Takashi H.
Taylor Mary Jane
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