2009 Fiscal Year Final Research Report
understanding of particle acceleration in lightning and thunderclouds via measurement of x rays and nuclear-gamma rays
| Project/Area Number |
19740167
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The Institute of Physical and Chemical Research |
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Principal Investigator |
TSUCHIYA Harufumi The Institute of Physical and Chemical Research, 牧島宇宙放射線研究室, 基礎科学特別研究員 (70415230)
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| Research Collaborator |
ENOTO Teruaki 東京大学東京大学, 大学院・理学系研究科・日本学術振興会, 特別研究員(DC1)
KATO Hiroshi 独立行政法人理化学研究所, 牧島宇宙放射線研究室, 先任技師
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| Project Period (FY) |
2007 – 2009
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| Keywords | 粒子加速 / 雷 / 雷雲 / ガンマ線 / 放射線観測 |
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| Research Abstract |
High-energy gamma rays, which are possibly associated with electron acceleration in thunderstorm activity, have been observed. Given these observations, we obtained a new idea that such gamma rays reveal mechanisms of electric-field acceleration, which is difficult to be investigated by space measurement. Hence, gamma-ray observations have been performed since 2006, at the coastal area of Japan sea and at a high mountain. By 2010 February, 8 thundercloud gamma-ray events were obtained. These detections confirmed that thunderclouds are indeed natural particle accelerators.
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