Cloud base height and cosmic rays
Cloud base height and cosmic rays
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DOI：
10.1098/rspa.2011.0040
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
R. Harrison;M. Ambaum;M. Lockwood
中科院分区：
文献类型：
--
作者：
R. Harrison;M. Ambaum;M. Lockwood
宇宙射线改变了全球大气电路中的电流。已经观察到在水平层云边缘的充电与通过云的全球电路垂直电流一致，这可以改变小而纯的水滴的性质。由于缺乏云边缘观测资料，阻碍了云底高度的研究。用阈值试验和谱分析方法对英国设得兰群岛勒威克天文台观测的云底高度进行了分析。发现低云（云底小于800米）的云底高度分布随宇宙线条件而变化。此外，27天和1.68年的宇宙射线变化的周期性特征，存在，弱，在层状云的云底高度数据，当这样的周期性存在于中子监测宇宙射线数据。这些特征支持了日光层变化通过全球大气电路传播到云层的想法。
Cosmic rays modify current flow in the global atmospheric electrical circuit. Charging at horizontal layer cloud edges has been observed to be consistent with global circuit vertical current flow through the cloud, which can modify the properties of small and pure water droplets. Studies have been hampered by the absence of cloud edge observations, hence cloud base height information is investigated here. Cloud base height measured at the Lerwick Observatory, Shetland, UK, is analysed using threshold tests and spectral analysis. The cloud base height distributions for low cloud (cloud base less than 800 m) are found to vary with cosmic ray conditions. Further, 27 day and 1.68 year periodicities characteristic of cosmic ray variations are present, weakly, in the cloud base height data of stratiform clouds, when such periodicities are present in neutron monitor cosmic ray data. These features support the idea of propagation of heliospheric variability into layer clouds, through the global atmospheric electric circuit.