@Article{AbduSobrNelsBati:1985:SoCyRe,
               author = "Abdu, Mangalathayil Ali and Sobral, Jose Humberto Andrade and 
                         Nelson, O. R. and Batista, Inez Staciarini",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Solar cycle related range type spread-F occurrence characteristics 
                         over equatorial and low latitude stations in Brazil",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "1985",
               volume = "47",
               number = "8-10",
                pages = "901--905",
                month = "Aug.-Oct.",
                 note = "Reuni{\~a}o anual da Sociedade brasileira para o progresso da 
                         Ci{\^e}ncia, 31; ISEA, 7, jul., 1984, S{\~a}o Paulo.",
             keywords = "range type spread-F, solar activity, equatorial stations, low 
                         latitude stations, Brazil.",
             abstract = "Range type spread-F occurrence rates from sunset to morning hours 
                         over Fortaleza (3.9°S,38.6°W, dip 3.5°S) and Cachoeira Paulista 
                         (22°41S, 45°W, dip 26°S) during the equinoctial month of October 
                         (that presents relatively high rates of occurrence) are analysed 
                         for the years 1973- 1982. Distinctly different occurrence rates 
                         are observed at the two stations. especially in the early 
                         post-sunset hours. Over Cachoeira Paulista the spread-F occurrence 
                         rate at 20 and 21 LT increased by approximately a factor of 3 from 
                         low to high sunspot years and starting from 22-23 LT this rate of 
                         increase diminished and even showed an inverse dependence with 
                         sunspot number towards early morning hours. Over Fortaleza, on the 
                         other hand, the spread-F occurrence rate in the early post-sunset 
                         hours remained very high, 90-100%, during 20-21 LT, with no 
                         variation from solar minimum to maximum epochs. The spread-F 
                         occurrence rate that appears to be nearly independent of sunspot 
                         number remained high up to midnight and fell towards morning 
                         hours. These results are interpreted on the bases of solar 
                         activity control on plasma bubble generation and its vertical rise 
                         velocity and F-region dynamo electric field.",
                  doi = "10.1016/0021-9169(85)90065-0",
                  url = "http://dx.doi.org/10.1016/0021-9169(85)90065-0",
                 issn = "1364-6826",
                label = "2446",
             language = "en",
           targetfile = "1-s2.0-0021916985900650-main (1).pdf",
        urlaccessdate = "30 abr. 2024"
}