@Article{PiazzaKaufPard:1983:VLIoLo,
               author = "Piazza, Liliane Rizzo and Kaufmann, Pierre and Pardo, P. Ramirez",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "VLF ionosonde and long-distance propagation anomalies produced by 
                         galactic Cen X-4 X-ray burst in May 1979",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "1983",
               volume = "45",
               number = "2/3",
                pages = "121--125",
                month = "Feb.-Mar.",
             keywords = "galactic X-ray, Cen X-4, VLF ionosonde.",
             abstract = "The galactic X-ray source Cen X-4 produced a large outburst in May 
                         1979, measured by the Ariel-5 satellite. Low ionosphere group 
                         heights measured daily by a VLF ionosonde indicated an anomalous 
                         lowering of the effective reflection height in good correlation 
                         with the Cen X-4 burst as well as an increase in the reflection 
                         coefficient, larger for frequencies. Diurnal VLF phase variations 
                         in a long-distance propagation path presented night-time 3-4 
                         standard deviations from the average in some days during the Cen 
                         X-4 bursting period. The geomagnetic activity in the period 
                         covered by this investigation was low, and the results obtained 
                         are a suggested confirmation that galactic transient X-ray sources 
                         are c apable of producing sufficient ionization effects to be 
                         detected as low ionosphere anomalies.",
                 issn = "1364-6826",
                label = "4413",
             language = "en",
           targetfile = "1-s2.0-S0021916983800166-main.pdf",
        urlaccessdate = "13 maio 2024"
}