tokens: ACKNOWLEDGEMENTS This work was supported by NASA Astrophysics Theory Program grant NNX13AG61G and the International Space Science Institute in Bern. SH was supported by Japan JSPS KAKENH 15K05040 and the joint research project of ILE, Osaka University. The radiation MHD simulation was partly carried out on the Cray XT4 at CfCA, National Astronomical Observatory of Japan, and on SR16000 at YITP in Kyoto University.
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