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@Article{LimaAraAlvBatCle:2015:VaMeHe,
               author = "Lima, Lourivaldo Mota and Ara{\'u}jo, Luciana Rodrigues and 
                         Alves, E. O. and Batista, Paulo Prado and Clemesha, Barclay 
                         Robert",
          affiliation = "{Universidade Estadual da Para{\'{\i}}ba (UEPB)} and 
                         {Universidade Estadual da Para{\'{\i}}ba (UEPB)} and 
                         {Universidade Estadual da Para{\'{\i}}ba (UEPB)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Variations in meteor heights at 22.7S during solar cycle 23",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2015",
               volume = "133",
                pages = "139--144",
                month = "Oct.",
             keywords = "Meteors, Meteor radar, Solar cycle, Long-term trend.",
             abstract = "The meteor radar measurements obtained at Cachoeira Paulista 
                         (22.7S), Brazil, have been used to study a possible relationship 
                         between meteor echo height variations and solar flux during solar 
                         cycle 23. A good concordance between the normalized values of the 
                         annual mean of the meteor peak heights and F10.7 solar radio flux 
                         and Mg_II solar indexes have been observed during declining phase 
                         of the solar cycle 23. After eliminating the solar activity 
                         influence, the annual mean of the meteor echo peak heights showed 
                         a linear decrease of 30 m/year when Mg_II solar index is used and 
                         38 m/year when F10.7 solar radio flux is used. When the trend is 
                         eliminated the relationship between meteor peak heights and F10.7 
                         solar flux indicate a trend of 672 m/100 sfu (sfu-solar flux 
                         unit). The meteor amplitude signals and the decay time drops after 
                         mid-2004, which may be attributed to the decreasing of the 
                         electron density in the meteor trails. The meteor echo peak height 
                         decrease has been interpreted as being caused by a reduction in 
                         air density in the upper atmosphere.",
                  doi = "10.1016/j.jastp.2015.08.015",
                  url = "http://dx.doi.org/10.1016/j.jastp.2015.08.015",
                 issn = "1364-6826",
             language = "en",
        urlaccessdate = "04 dez. 2020"
}


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