Multi-station synthesis of early twentieth century surface atmospheric electricity measurements for upper tropospheric properties

• Published in: Advances in geosciences Vol. 13; pp. 17 - 23
• Main Authors: Harrison, R. G., Bennett, A. J.
• Format: Journal Article
• Language: English
• Published: European Geosciences Union 30.07.2007; Copernicus Publications
• Subjects: Earth Sciences; Sciences of the Universe
• ISSN: 1680-7359; 1680-7340; 1680-7359
• DOI: 10.5194/adgeo-13-17-2007

The vertical columnar current density in the global atmospheric electrical circuit depends on the local columnar resistance. A simple model for the columnar resistance is suggested, which separates the local boundary layer component from the upper troposphere cosmic ray component, and calculates the boundary layer component from a surface measurement of air conductivity. This theory is shown to provide reasonable agreement with observations. One application of the simple columnar model theory is to provide a basis for the synthesis of surface atmospheric electrical measurements made simultaneously at several European sites. Assuming the ionospheric potential to be common above all the sites, the theoretical air-earth current density present in the absence of a boundary layer columnar resistance can be found by extrapolation. This is denoted the free troposphere limit air-earth current density, J0. Using early surface data from 1909 when no ionospheric potential data are available for corroboration, J0 is found to be ~6 pA m−2, although this is subject to uncertainties in the data and limitations in the theory. Later (1966–1971) European balloon and surface data give J0=2.4 pA m−2.