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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Source of prolonged bursts of high-energy gamma rays detected in thunderstorm atmosphere in Japan at the coastal area of the Sea of Japan and on high mountaintop
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Source of prolonged bursts of high-energy gamma rays detected in thunderstorm atmosphere in Japan at the coastal area of the Sea of Japan and on high mountaintop

机译：长期的高能伽马源在日本射线在雷雨中发现大气在日本海的沿海地区高山顶

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摘要

To analyze whether relativistic runaway electron avalanches (RREAs) are capable of developing inside tropospheric thunderclouds, we carried out numerical simulations in real atmosphere of hard γ ray bursts with a duration of 1 min observed in Japan from thunderclouds at sea level and on high mountaintop, assuming that the bursts originated from a point source of bremsstrahlung produced by RREA. Portions and on-ground fluence of γ rays reaching the sea level were calculated for various source altitudes h. For fitting the observations at the coast of the Sea of Japan, the source should be localized at altitudes h = 0.5-2 km. The on-ground γ ray spectra calculated for these source altitudes are close to the spectrum observed at the coast and the spectrum of terrestrial γ ray flashes observed in the near space. The numbers of γ photons emitted by the source at h = 0.5-2 km fitting the γ ray fluence measured at the coast are in the range of 10~(12)-10~(15). The required RREA enhancement fits the limitation imposed by the relativistic feedback by Dwyer (2003a, 2005, 2007). Both emission and on-ground γ spectra calculated for the air layer of 70 g cm~(-2) are close to the γ-burst spectrum observed at the mountaintop. We numerically predicted the characteristics of neutron pulse that most likely accompanied the γ bursts. The proximity of the emission and observed spectra prove that the γ source was close to the top. As a whole, the results of the simulations testify that RREAs could be responsible for the observed γ bursts and, consequently, that they are capable of developing inside tropospheric thunderclouds.
机译：分析相对论是否失控的电子雪崩(RREAs)发展的能力在对流层雷云,我们执行数值模拟在实际大气的辛苦γ射线爆发的持续时间1分钟中观察到日本从雷云在海平面和高山顶,假设爆发的起源从产生的轫致辐射的来源RREA。到达海平面计算各种源高度h。配件观察在日本海的海岸,源应该局部高度h =0.5 - 2公里。这些源高度接近频谱观察到海岸和频谱陆地γ射线闪光的观察在不久的空间。源在h = 0.5 - 2公里γ射线影响以海岸的范围-10年10 ~(12)~(15)。符合相对论所强加的限制反馈的德怀尔(2003、2005、2007)。发射和地面γ谱计算70克的空气层厘米~(2)接近γ破裂频谱观察到山顶。数值预测的特点中子脉冲,最有可能伴随γ爆发。观察到光谱证明γ源接近顶部。模拟RREAs可以作证负责观察到的γ暴,因此,他们有能力发展在对流层雷云。

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