author = "Grams, Guilherme and Schuch, Nelson Jorge and Braga, Carlos 
                         Roberto and Kane, Rajaram Purushottam and Echer, Ezequiel and 
                         Stekel, Tardelli Ronan Coelho",
          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)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Statistical study of muons counts rates in differents directions, 
                         observed at the Brazilian Southern Space Observatory",
                 year = "2010",
                pages = "1670",
         organization = "COSPAR Scientific Assembly, 38.",
             abstract = "Cosmic ray are charged particles, at the most time protons, that 
                         reach the earth's magne-tosphere from interplanetary space with 
                         velocities greater than the solar wind. When these impinge the 
                         atmosphere, they interact with atmosphere constituents and decay 
                         into sub-particles forming an atmospheric shower. The muons are 
                         the sub-particles which normally maintain the originated direction 
                         of the primary cosmic ray. A multi-directional muon detec-tor 
                         (MMD) was installed in 2001 and upgraded in 2005, through an 
                         international cooperation between Brazil, Japan and USA, and 
                         operated since then at the Southern Space Observatory 
                         -SSO/CRS/CCR/INPE -MCT, (29,4 S, 53,8 W, 480m a.s.l.), S{\~a}o 
                         Martinho da Serra, RS, a Brazil. The main objetive of this work is 
                         to present a statistical analysis of the intensity of muons, with 
                         energy between 50 and 170 GeV, in differents directions, measured 
                         by the SSO's multi-directional muon detector. The analysis was 
                         performed with data from 2006 and 2007 collected by the SSO's MMD. 
                         The MMD consists of two layers of 4x7 detectors with a total 
                         observation area of 28 m2 . The counting of muons in each 
                         directional channel is made by a coincidence of pulses pair, one 
                         from a detector in the upper layer and the other from a detector 
                         in the lower layer. The SSO's MMD is equipped with 119 directional 
                         channels for muon count rate measurement and is capable of 
                         detecting muons incident with zenithal angle between 0 and 75,53 
                         . A statistical analysis was made with the MMD muon count rate for 
                         all the di-rectional channels. The average and the standard 
                         deviation of the muon count rate in each directional component 
                         were calculated. The results show lower cont rate for the channels 
                         with larger zenith, and higher cont rate with smaller zenith, as 
                         expected from the production and propagation of muons in the 
                         atmosphere. It is also possible to identify the Stormer cone. The 
                         SSO's MMD is also a detector component of the Global Muon Detector 
                         Network (GMDN), which has been developed in an international 
                         collaboration lead by Shinshu University, Japan.",
  conference-location = "Bremen, Germany",
      conference-year = "18 - 25 July 2010",
                label = "self-archiving-INPE-MCTIC-GOV-BR",
             language = "en",
           targetfile = "grams_statistical.pdf",
                  url = "",
               volume = "38",
        urlaccessdate = "2021, Mar. 06"