大气中红外辐射的Cosmic ray调制
Cosmic ray modulation of infra-red radiation in the atmosphere
摘要：
宇宙射线穿过低层大气时会产生分子团簇离子。中性的分子团簇，如二聚体和复合物，预计会对辐射平衡做出很小的贡献，但迄今为止还没有观察到带电团簇的大气吸收。在一项大气实验中，一个调谐到9.15微米吸收带的热电堆滤波辐射计被用来监测由一个对高能（> 400 MeV）粒子（主要是μ子）敏感的宇宙射线望远镜发现的事件之后的变化，该辐射计与分子团簇离子的红外吸收有关。由于分子团簇离子的存在，该吸收带中长波辐射的变化为7 mWm^-2。每次事件的大气能量变化积分为2焦耳^-2，与典型空气簇射的估计能量密度相比，放大系数为10^12。预计这种吸收将在全球持续发生，但计算表明，它对气候的影响很小。
英文摘要：
Cosmic rays produce molecular cluster ions as they pass through the lower atmosphere. Neutral molecular clusters such as dimers and complexes are expected to make a small contribution to the radiative balance, but atmospheric absorption by charged clusters has not hitherto been observed. In an atmospheric experiment, a thermopile filter radiometer tuned to a 9.15μm absorption band, associated with infra-red absorption of molecular cluster ions, was used to monitor changes following events identified by a cosmic ray telescope sensitive to high energy (>400MeV) particles, principally muons. The change in longwave radiation in this absorption band due to molecular cluster ions is 7 mWm^-2. The integrated atmospheric energy change for each event is 2Jm^-2, representing an amplification factor of 10^12 compared to the estimated energy density of a typical air shower. This absorption is expected to occur continuously and globally, but calculations suggest that it has only a small effect on climate.
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