Browsing by Author "Carey, J."
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Item Restricted On the lack of southern hemisphere polar mesosphere summer echoes(American Geophysical Union, 1995-06-20) Balsley, B.B.; Woodman Pollitt, Ronald Francisco; Sarango, M.; Rodriguez, R.; Urbina, J.; E. Ragaini; Carey, J.; Huaman, M.; Giraldez, A.We report VHF radar observations of the southern high-latitude mesopause region using wind profilers that were installed recently on King George Island, Antarctica, and Ushuaia, Argentina. Briefly, our observations, which were made during January and February 1993, show almost no evidence of so-called polar mesosphere summer echoes, or PMSE. Since these echoes are a predominant feature of the northern high-latitude mesosphere in summer, their absence in the southern hemisphere is both surprising and intriguing. In this paper we present evidence demonstrating the virtual absence of the echoes and demonstrate that our systems were capable of detecting them had they been present. We also outline some of the consequences of this intriguing result, which are supported by observed hemispheric differences in polar mesospheric clouds, mesospheric temperatures, upper atmospheric gravity wave activity, and mean circulation patterns.Item Restricted Southern-hemisphere PMSE: Where are they?(American Geophysical Union, 1993-09) Balsley, B. B.; Woodman Pollitt, Ronald Francisco; Sarango, M.; Urbina, J.; Rodríguez, R.; Ragaini, E.; Carey, J.We report a surprising absence of PMSE (Polar Mesospheric Summer Echoes) in VHF radar observations of the southern summer high-latitude mesosphere. Our observations cover about twenty days during January-February, 1993, from King George Island, Antarctica.Item Restricted Wind profiler installed in Antarctica(American Geophysical Union, 1993-08) Balsley, B. B; Carey, J.; Woodman Pollitt, Ronald Francisco; Sarango, M.; Urbina, J.; Rodríguez, R.; Ragaini, E.A VHF (50 MHz) wind profiler was installed in Antarctica at the Peruvian Base Machu Picchu on King George Island from January 21 to 26. The wind profiler will provide a first look at atmospheric dynamics over the region. The profiler-the first of its kind in Antarctica-is a National Science Foundation sponsored cooperative project of the University of Colorado, the Geophysical Institute of Peru, the University of Piura (Peru), and the Peruvian Navy. This venture was also greatly facilitated by Peru's Comision Nacional de Asuntos Antartidos and Consejo Nacional de Ciencias y Tecnologia, with additional logis tics support provided by the Argentinean Navy and the Uruguayan Air Force.