@Article{MunakataKEKKTSDMBSJSDHSK:2018:CoShBu,
               author = "Munakata, K. and Kozai, M. and Evenson, Paul and Kuwabara, T. and 
                         Kato, C. and Tokumaru, Munetoshi and Silva, Marlos Rockenbach da 
                         and Dal Lago, Alisson and Mendon{\c{c}}a, Rafael Rodrigues Souza 
                         de and Braga, Carlos Roberto and Schuch, Nelson Jorge and Jassar, 
                         H. K. Al and Sharma, M. M. and Duldig, M. L. and Humble, J. E. and 
                         Sabbah, I. and K{\'o}ta, J.",
          affiliation = "{Shinshu University} and Institute of Space and Astronautical 
                         Science, Japan Aerospace Exploration Agency (ISAS/JAXA) and 
                         {University of Delaware} and {University of Delaware} and {Shinshu 
                         University} and {Nagoya University} 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)} and {Kuwait 
                         University} and {Kuwait University} and {University of Tasmania} 
                         and {University of Tasmania} and College of Health Sciences, 
                         Public Authority of Applied Education and Training, Kuwait City 
                         and {University of Arizona}",
                title = "Cosmic-Ray Short Burst Observed with the Global Muon Detector 
                         Network (GMDN) on 2015 June 22",
              journal = "Astrophysical Journal",
                 year = "2018",
               volume = "862",
               number = "2",
                pages = "e170",
                month = "Aug.",
             keywords = "cosmic rays, interplanetary medium, Sun: coronal mass ejections 
                         (CMEs).",
             abstract = "We analyze the short cosmic-ray intensity increase ({"}cosmic-ray 
                         burst{"}: CRB) on 2015 June 22 utilizing a global network of muon 
                         detectors and derive the global anisotropy of cosmic-ray intensity 
                         and the density (i.e., the omnidirectional intensity) with 10 
                         minute time resolution. We find that the CRB was caused by a local 
                         density maximum and an enhanced anisotropy of cosmic rays, both of 
                         which appeared in association with Earth's crossing of the 
                         heliospheric current sheet (HCS). This enhanced anisotropy was 
                         normal to the HCS and consistent with a diamagnetic drift arising 
                         from the spatial gradient of cosmic-ray density, which indicates 
                         that cosmic rays were drifting along the HCS from the north of 
                         Earth. We also find a significant anisotropy along the HCS, 
                         lasting a few hours after the HCS crossing, indicating that cosmic 
                         rays penetrated into the inner heliosphere along the HCS. Based on 
                         the latest geomagnetic field model, we quantitatively evaluate the 
                         reduction of the geomagnetic cutoff rigidity and the variation of 
                         the asymptotic viewing direction of cosmic rays due to a major 
                         geomagnetic storm that occurred during the CRB and conclude that 
                         the CRB is not caused by the geomagnetic storm, but by a rapid 
                         change in the cosmic-ray anisotropy and density outside the 
                         magnetosphere.",
                  doi = "10.3847/1538-4357/aacdfe",
                  url = "http://dx.doi.org/10.3847/1538-4357/aacdfe",
                 issn = "0004-637X and 1538-4357",
             language = "en",
           targetfile = "munakata_cosmic.pdf",
        urlaccessdate = "23 maio 2024"
}