@MastersThesis{Rozenfeld:1969:PrMeAt,
               author = "Rozenfeld, Pawel",
                title = "Some aspects of V.L.F. propagation by means of atmospherics",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "1969",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "1969-08",
             keywords = "atmopheric propagation, propaga{\c{c}}{\~a}o atmosf{\'e}rica.",
             abstract = "A short review of the source and propagation characteristics of 
                         atmospherics is given. Basic concepts of mode theory of wave 
                         propagation are presented and the single-station and multi-station 
                         techniques used by earlier workers to study the propagation of 
                         atmospherics are discussed. Using the single-station technique the 
                         distances to origin and amplitude spectra of atmospherics are 
                         determined. It was observed that the amplitudes of nighttime 
                         spectra are always greater than the amplitudes of daytime spectra. 
                         There is a tendency for the peak frequency of atmospherics to vary 
                         with distance during the day and night. The results indicate that 
                         there is probably an energy maximum in the ELF band bayond the 
                         maximum observed in the V.L.F. band. RESUMO: Uma breve 
                         revis{\~a}o das caracter{\'{\i}}sticas de origem e 
                         propaga{\c{c}}{\~a}o de ru{\'{\i}}dos {\'e} dado. Conceitos 
                         b{\'a}sicos da teoria do modo de propaga{\c{c}}{\~a}o da onda 
                         s{\~a}o apresentados e as t{\'e}cnicas de esta{\c{c}}{\~a}o 
                         {\'u}nica e multi-esta{\c{c}}{\~a}o utilizados pelos 
                         trabalhadores anteriores para estudar a propaga{\c{c}}{\~a}o de 
                         ru{\'{\i}}dos s{\~a}o discutidos. Usando a 
                         {\'u}nica-t{\'e}cnica esta{\c{c}}{\~a}o as dist{\^a}ncias 
                         {\`a} origem e espectros de amplitude est{\'a}tica s{\~a}o 
                         determinados. Observou-se que as amplitudes dos espectros noite 
                         s{\~a}o sempre maiores do que as amplitudes dos espectros diurna. 
                         H{\'a} uma tend{\^e}ncia para que o pico de frequ{\^e}ncia de 
                         atmosferas para variar com a dist{\^a}ncia durante o dia e {\`a} 
                         noite. Os resultados indicam que h{\'a} provavelmente um 
                         m{\'a}ximo de energia na banda ELF bayond m{\'a}xima observada 
                         no VLF banda.",
            committee = "Rai, Dharam Bir (orientador)",
           copyholder = "SID/SCD",
         englishtitle = "Alguns aspectos da propaga{\c{c}}{\~a}o V.L.F. na atmosfera",
             language = "en",
                pages = "57",
                  ibi = "6qtX3pFwXQZ3P8SECKy/Gq7Ro",
                  url = "http://urlib.net/ibi/6qtX3pFwXQZ3P8SECKy/Gq7Ro",
           targetfile = "publicacao.pdf",
        urlaccessdate = "19 abr. 2024"
}