Effect of the troposphere on surface neutron counter measurements

被引:13
作者
Aplin, KL [1 ]
Harrison, RG
Bennett, AJ
机构
[1] Rutherford Appleton Lab, Space Sci & Technol Dept, Didcot OX11 0QX, Oxon, England
[2] Univ Reading, Dept Meteorol, Reading RG6 6BB, Berks, England
来源
GREENHOUSE GASES, OZONE, AND ELECTRODYNAMICS; THEIR CHANGES IN THE MIDDLE ATMOSPHERE AND LOWER THERMOSPHERE | 2005年 / 35卷 / 08期
关键词
cosmic rays; neutron counter; atmospheric ionisation; geopotential height;
D O I
10.1016/j.asr.2005.02.055
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
Surface neutron counter data are often used as a proxy for atmospheric ionisation from cosmic rays in studies of extraterrestrial effects on climate. Neutron counter instrumentation was developed in the 1950s and relationships between neutron counts, ionisation and meteorological conditions were investigated thoroughly using the techniques available at the time; the analysis can now be extended using modern data. Whilst surface neutron counts are shown to be a good proxy for ionisation rate, the usual meteorological correction applied to surface neutron measurements, using surface atmospheric pressure, does not completely compensate for tropospheric effects on neutron data. Residual correlations remain between neutron counts, atmospheric pressure and geopotential height, obtained from meteorological reanalysis data. These correlations may be caused by variations in the height and temperature of the atmospheric layer at similar to 100 hPa. This is where the primary cosmic rays interact with atmospheric air, producing a cascade of secondary ionising particles. (c) 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:1484 / 1491
页数:8
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