author = "Pautet, P. -D. and Stegman, J. and Wrasse, C. M. and {K. Nielsen} 
                         and Takahashi, H. and Taylor, M. J. and Hoppel, K. W. and 
                         Eckermann, S. D.",
          affiliation = "Center for Atmospheric and Space Sciences, Utah State University, 
                         Logan, UT 84322-4405, USA and Department of Meteorology, Stockholm 
                         University, Stockholm, Sweden and Instituto de Pesquisa e 
                         Desenvolvimento, Universidade do Vale do Para{\'{\i}}ba, 
                         S{\~a}o Jos{\'e} dos Campos, SP, Brazil and Computational 
                         Physics Inc., Boulder, CO, USA and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and Center for Atmospheric and Space 
                         Sciences, Utah State University, Logan, UT 84322-4405, USA and 
                         Naval Research Laboratory, Washington, DC, USA and Naval Research 
                         Laboratory, Washington, DC, USA",
                title = "Analysis of gravity waves structures visible in noctilucent cloud 
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2010",
               volume = "73",
               number = "2011",
                pages = "20822090",
                month = "July",
             keywords = "Noctilucent clouds (NLC), Mesosphere lower thermosphere (MLT), 
                         Gravity waves, Image processing Article Outline.",
             abstract = "The noctilucent clouds (NLC) are high-altitude bright cloud 
                         formations visible under certain conditions from high-latitude 
                         places during the summer months. Even if the exact nature of these 
                         clouds still remains a mystery, they are an efficient tracer of 
                         the dynamic processes at their level, particularly the gravity 
                         waves propagating from the stratosphere through the mesopause 
                         layer. In this paper, we describe a technique developed to analyze 
                         the structures visible in the NLC images taken every summer night 
                         since 2004 from Stockholm, Sweden (59.4N). The parameters of 30 
                         short-period gravity wave events have been measured and compared 
                         with older datasets obtained mostly from low and mid-latitude 
                         sites, using airglow imaging techniques. The horizontal 
                         wavelengths are in good agreement with previous results while the 
                         observed horizontal phase speeds exhibit smaller values than for 
                         other sites. The directionality of the waves presents strong 
                         poleward preference, traditionally observed during the summer 
                         season. This anisotropy and the difference in the phase speed 
                         distribution cannot be explained by the filtering due to the 
                         background wind field but more probably by the position of the 
                         gravity waves sources, located to the south of the observation 
                  doi = "10.1016/j.jastp.2010.06.001",
                  url = "http://dx.doi.org/10.1016/j.jastp.2010.06.001",
                 issn = "1364-6826",
             language = "en",
           targetfile = "pautet.pdf",
        urlaccessdate = "25 jul. 2021"