@Article{MunakataKKHKKTMEDSSBBASDHSEMKRSMNK:2022:LaBiAn,
               author = "Munakata, K. and Kozai, M. and Kato, C. and Hayashi, Y. and 
                         Kataoka, R. and Kadokura, A. and Tokumaru, M. and Mendon{\c{c}}a, 
                         Rafael Rodrigues Souza and Echer, Ezequiel and Dal Lago, Alisson 
                         and Silva, Marlos Rockenbach da and Schuch, Nelson Jorge and 
                         Bageston, Jos{\'e} Valentin and Braga, C. R. and Al Jassar, H. K. 
                         and Sharma, M. M. and Duldig, M. L. and Humble, J. E. and Sabbah, 
                         I. and Evenson, P. and Mangeard, P-S. and Kuwabara, T. and 
                         Ruffolo, D. and Saiz, A. and Mitthumsiri, W. and Nuntiyakul, W. 
                         and Kota, J.",
          affiliation = "{Shinshu University } and {Polar Environment Data Science Center } 
                         and {Shinshu University } and {Shinshu University } and {National 
                         Institute of Polar Research } and {Polar Environment Data Science 
                         Center } 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 {Instituto 
                         Nacional de Pesquisas Espaciais (INPE) } and {George Mason 
                         University } 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 Delaware } and 
                         {University of Delaware } and {University of Delaware } and 
                         {Mahidol University } and {Mahidol University } and {Mahidol 
                         University } and {Chiang Mai University } and {University of 
                         Arizona}",
                title = "Large-amplitude Bidirectional Anisotropy of Cosmic-Ray Intensity 
                         Observed with Worldwide Networks of Ground-based Neutron Monitors 
                         and Muon Detectors in 2021 November",
              journal = "Astrophysical Journal",
                 year = "2022",
               volume = "938",
               number = "1",
                pages = "e30",
                month = "Oct.",
             abstract = "We analyze the cosmic-ray variations during a significant Forbush 
                         decrease observed with worldwide networks of ground-based neutron 
                         monitors and muon detectors during 2021 November 3-5. Utilizing 
                         the difference between primary cosmic-ray rigidities monitored by 
                         neutron monitors and muon detectors, we deduce the rigidity 
                         spectra of the cosmic-ray density (or omnidirectional intensity) 
                         and the first- and second-order anisotropies separately for each 
                         hour of data. A clear two-step decrease is seen in the cosmic-ray 
                         density with the first similar to 2% decrease after the 
                         interplanetary shock arrival followed by the second similar to 5% 
                         decrease inside the magnetic flux rope (MFR) at 15 GV. Most 
                         strikingly, a large bidirectional streaming along the magnetic 
                         field is observed in the MFR with a peak amplitude of similar to 
                         5% at 15 GV, which is comparable to the total density decrease 
                         inside the MFR. The bidirectional streaming could be explained by 
                         adiabatic deceleration and/or focusing in the expanding MFR, which 
                         have stronger effects for pitch angles near 90 degrees, or by 
                         selective entry of GCRs along a leg of the MFR. The peak 
                         anisotropy and density depression in the flux rope both decrease 
                         with increasing rigidity. The spectra vary dynamically, indicating 
                         that the temporal variations of density and anisotropy appear 
                         different in neutron monitor and muon detector data.",
                  doi = "10.3847/1538-4357/ac91c5",
                  url = "http://dx.doi.org/10.3847/1538-4357/ac91c5",
                 issn = "0004-637X and 1538-4357",
             language = "en",
           targetfile = "Munakata_2022_ApJ_938_30.pdf",
        urlaccessdate = "13 maio 2024"
}