Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13b0285p&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA13B-0285
Physics
2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Acoustic-Gravity Waves, 3394 Instruments And Techniques
Scientific paper
Atmospheric gravity waves propagating from the troposphere up to the lower thermosphere play a key role in the thermal structure and large-scale circulation of the mid-atmosphere. The NASA Living with a Star program supported a campaign in Brazil to study the effects of gravity waves on the ionosphere and particularly their role in the seeding of Rayleigh-Taylor instabilities, strong equatorial spread-F and plasma bubbles. Several US and Brazilian institutes involved in this project deployed a broad range of instruments (all-sky imagers, digisondes, photometers, meteor/VHF radars, GPS receivers) to cover a large area of Brazil. The campaign was divided in two observational phases centered on the September and October new moon periods. This talk summarizes the results obtained with the USU all-sky CCD imager operated at Sao Joao d'Alianca (14.8°S, 47.6°W). The data obtained during 17 clear nights have been studied to determine the characteristics of the short-period gravity waves observed at mesospheric heights. The results show two main directions of propagation (towards NE and SE) as well as the presence of several gravity wave events with wavelength greater than 100km that are thought to be more important for ionospheric seeding. The OH mesospheric structures and the thermospheric bubbles (observed in the 630nm emission) will also be presented and compared with the results obtained with the Brazilian imager located at Cariri (7°S, 36°W), closer to the equator.
Fritts David C.
Medeiros A.
Pautet P.
Takahashi Hiroyuki
Taylor Mary Jane
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