検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

雷活動に起因した高エネルギー放射線のゾンデ、航空機、及び地上での観測

Measurement of radiation caused by thunderstorm activities by a sounding balloon, an airplane, and the ground

鳥居 建男 ; 眞田 幸尚  ; 山田 勉; 織田 忠; 村岡 浩治*; 佐藤 昌之*; 渡邊 明*; 久米 恭*; 長谷川 崇*; 杉田 武志*

Torii, Tatsuo; Sanada, Yukihisa; Yamada, Tsutomu; Orita, Tadashi; Muraoka, Koji*; Sato, Masayuki*; Watanabe, Akira*; Kume, Kyo*; Hasegawa, Takashi*; Sugita, Takeshi*

雷活動により高エネルギー放射線が様々なフィールドで観測されている。その放射源を調査するために、放射能ゾンデ, 航空機、及び地上観測により放射線の測定を行った。ゾンデ観測では2つのGM管を用いて雷活動中に放球した。その結果、雷雲中の高度5から7.5km付近で2桁程度の放射線計数率の上昇が観測された。また、航空機に大型NaI検出器を搭載して夏季と冬季に雷雲上空を飛行した。さらに、冬季には日本海沿岸で地上観測を行い、高エネルギー放射線を観測した。これらの測定結果について報告する。

Energetic radiation caused by thunderstorm activity is observed at various places, such as the ground, high mountain areas, and artificial satellites. In order to investigate the radiation source and its energy distribution, we measured energetic radiation by a sounding balloon, an airplane, and the ground observation. On the measurement inside the thundercloud, we conducted a sounding observation using a radiosonde mounted two GM tubes (for $$gamma$$-rays, and for $$beta$$/$$gamma$$-rays), in addition to meteorological instruments. The balloon passed through a region of strong echoes in a thundercloud shown by radar image, at which time an increase in counting rate of the GM tube about 2 orders of magnitude occurred at the altitude from 5 km to 7.5 km. Furthermore, the counting rate of 2 GM tubes indicated the tendency different depending on movement of a balloon. This result suggests that the ratio for the $$gamma$$-rays (energetic photons) of the beta-rays (energetic electrons) varies according to the place in the thundercloud. Then, we measured the variation of the energetic radiation from the top of the thundercloud using an airplane. At this time, we used two NaI detectors different in the size. We performed the radiation measurement by flying around the thunderclouds at 12 - 14 km in height by the observation in the summer. Moreover, in the winter season, we flew 5 - 6 km in height and measured the radiation around the thunderclouds. Furthermore, we carried out a ground observation of the energetic $$gamma$$ rays during winter thunderstorm at a coastal area facing the Sea of Japan. Two types of the energetic radiation have been observed at this time. We report the outline of these measurements and analysis in the session of the JpGU meeting.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.