雷雲は天然の粒子加速器か？
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(127) -V ¡¢£Y¤#5] Sprite-SAT ¥bFd ¦3§¨B6 )*+. ῎῍ῑῌ 1) Tsuchiya H., Enoto T., Yamada S., Yuasa T., Makishima K., et al., 2007, Phys. Rev. Lett. 99, 165002 2) Fishman G. J., et al., 1994, Science 264, 1313 3) MacCarthy M., Parks G. K., 1985, Geophys. Res. Lett. 12(6), 393 4) Eack B., et al., 1996, J. Geophys. Res. 101(D23), 29637 5) Moore C. B., et al., 2001, Geophys. Res. Lett. 28, 2141 6) Dwyer J. R., et al., 2003, Science 299, 694 7) Dwyer J. R., et al., 2004, Geophys. Res. Lett. 31, L05119 8) Torii T., et al., 2002, J. Geophys. Res. 107, 4324 9) W,©ª«$ 2003, $¬%®&¯=>5] 676. Detection of Gamma-Rays from Winter Thunderclouds along the Coast of Japan Sea Teruaki ENOTO Department of Physics, Graduate School of Science, The University of Tokyo, 7ῌ3ῌ1 Hongo, Bunkyo-ku, Tokyo 113ῌ0033, Japan Harufumi TSUCHIYA Cosmic Radiation Laboratory, RIKEN, 2ῌ1 Hirosawa, Wako, Saitama 351ῌ0198, Japan Abstract : Recently, there is a possibility that electrons are accelerated to relativistic velocities in the electric fields of thunderclouds and/or natural lightning. Along the coastal area of Japan Sea, some dose increases associated with winter thunderclouds have been reported, but the mechanism is still unknown due to lack of detailed information on the types of radiation, short-term intensity variations, and the energy spectra. In order to investigate those phenomena in further detail, we started “GROWTH (Gamma-Ray Observation of Winter Thunderclouds) collaboration.” Our new system, installed at the coastal area of Japan Sea, has been successfully operated since 2006. We observed two intense dose increases, with a duration around 1 minutes,associated with winter thunderclouds. The measurement clearly revealed that the increase is caused by high energy gamma-rays with a hard spectrum extending up to 10 MeV.. }¼,. 2008 + 11 ¼.
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