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| Titel |
Two types of energetic radiation associeted with thunderstorm activity observed in Japan |
| VerfasserIn |
T. Torii, T. Sugita, S. Tanabe, Y. Kimura, M. Kamogawa, K. Yajima, H. Yasuda |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030193
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| Zusammenfassung |
| The dose rate of the gamma-rays increases in association with the activities of the
thunderstorm. They were observed on the ground in the winter season of Japan. As an
observed result, the following two types of the radiation enhancements have been found
during the winter thunderstorm activities; the gradual variation of photon intensity with
energy of a few MeV, and the burst type of the radiation that is attributed to the injection of
high energy photons with the energy over 10MeV. Furthermore, fluctuations of energetic
radiation that were seemed to be caused by a summer thunderstorm activity were observed at
the top of Mt. Fuji. The largest of such fluctuations was gradual and lasted for about 20
minutes, and was found to be high-energy gamma rays having a continuous energy spectrum
up to 10Â MeV or more. As for the feature of the gradual fluctuations, it seems naturally that
such fluctuations are caused by the bremsstrahlung photons generated by the energetic
electrons produced continuously with an intense electric field in the thundercloud. |
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