%0 Journal Article %T The spatial density gradient of galactic cosmic rays and its solar cycle variation observed with the Global Muon Detector Network %A Kozai, Masayoshi %A Munakata, Kazuoki %A Kato, Chihiro %A Kuwabara, Takao %A Bieber, John %A Evenson, Paul %A Rockenbach, Marlos %A Lago, Alisson %A Schuch, Nelson %A Tokumaru, Munetoshi %A Duldig, Marcus %A Humble, John %A Sabbah, Ismail %A Al Jassar, Hala %A Sharma, Madan %A Kóta, Jozsef %J Earth, Planets and Space %V 66 %N 1 %P 1-8 %D 2014-11-14 %I Springer Berlin Heidelberg %~ DeepDyve