@InProceedings{PortugalEcheEchePaci:2018:StStAb,
               author = "Portugal, Williamary and Echer, Ezequiel and Echer, Mariza Pereira 
                         de Souza and Pacini, Alessandra Abe",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {National Astronomy and Ionosphere 
                         Center - Arecibo Observatory}",
                title = "A statistical study about the effects of Forbush Decrease events 
                         on latitudinal temperature of the near-ground air",
                 year = "2018",
         organization = "Latin American Conference on Space Geophysics, 11. (COLAGE)",
             abstract = "We present in this work a statistical study of the near-ground air 
                         temperatures in different latitudes during periods with decrease 
                         of atmospheric ionization induced by Galactic Cosmic Rays (GCR) on 
                         the Earths atmosphere. These GCR fluxes reductions are called 
                         Forbush Decreases (FD), and they are mainly caused by 
                         interplanetary Coronal Mass Ejection (CME) deflection of GCR 
                         around Earth´s orbit. This study was perfomed considering the 
                         possible influence of the cosmogenic atmospheric ionization on the 
                         water vapor condensation patterns (link GCR cloud condensation 
                         nuclei) as the main hypothesis to be tested. For that, we have 
                         conducted a study to analyze these possible effects on the air 
                         surface temperature, using superposed epoch analysis around the 
                         ten strongest FD events occurred between 1987 and 2015. GCR data 
                         were collected from Oulu neutron monitor (cosmicrays.oulu.fi), and 
                         air surface temperature data were obtained from NOAA - National 
                         Oceanic Atmospheric Administration / GSOD - Global Surface Summary 
                         of the Day 
                         (https://data.noaa.gov/dataset/global-surfacesummary-of-the-day-gsod) 
                         of ten meteorological stations of three latitudinal ranges of 
                         Northern and Southern hemispheres (20 - 30, 40 - 50 e 60 - 70). We 
                         investigate here the variation of the daily average of the air 
                         temperature near ground during FD for each one of the three 
                         latitudinal ranges. The possible climatic effects of GCR decrease 
                         were considered using linear and cross correlation methods. The 
                         comparison between the near ground air temperature daily averages 
                         during FD events periods and equivalent periods without FDs 
                         (during solar minima years of 1987, 1996 and 2008) was also 
                         performed. Some results for the Northern hemisphere have showed a 
                         latitudinal dependence of the induced ionization by GCR on the 
                         atmospheric parameters. It was possible to note the anti 
                         correlation between the surface temperature mean and the GCR flux, 
                         increasing from low to high latitudes. However, for the Southern 
                         hemisphere, the anti correlation between these data was only found 
                         for the high and medium latitudes, also with a poleward increase. 
                         From these results it seems that the FD effect on climate is more 
                         prominent in the Northern hemisphere and that there is increases 
                         with latitude.",
  conference-location = "Buenos Aires, Argentina",
      conference-year = "16-20 abr.",
             language = "en",
           targetfile = "portugal_statistical.pdf",
        urlaccessdate = "28 abr. 2024"
}