 |
| Titel |
Multi-station synthesis of early twentieth century surface atmospheric electricity measurements for upper tropospheric properties |
| VerfasserIn |
R. G. Harrison, A. J. Bennett |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7340
|
| Digitales Dokument |
URL |
| Erschienen |
In: Solar, heliospheric and external geophysical effects on the Earth’s environment: scientific and educational initiatives ; Nr. 13 (2007-07-30), S.17-23 |
| Datensatznummer |
250011696
|
| Publikation (Nr.) |
 copernicus.org/adgeo-13-17-2007.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|