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| Titel |
Studies of an artificially generated electrode effect at ground level |
| VerfasserIn |
E. A. Mareev, S. Israelsson, E. Knudsen, A. V. Kalinin, M. M. Novozhenov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 10 ; Nr. 14, no. 10, S.1095-1101 |
| Datensatznummer |
250012434
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| Publikation (Nr.) |
 copernicus.org/angeo-14-1095-1996.pdf |
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| Zusammenfassung |
| The outdoor experiments, using a metallic
grid above the ground surface, have yielded well-defined vertical profiles of
the space-charge density. The profiles showed strong evidence for the existence
of an electrode effect, which could be named the artificial electrode effect and
can serve as a very useful and well-controlled model for the study of
atmospheric electric processes in the atmospheric surface layer. The build-up or
break-down of an electrode-effect layer occurred in a time of the order of 10 s
under the experimental conditions realized. The artificially generated electrode
effect is dependent on the electrical field strength supplied, wind speed,
turbulent mixing and ion mobilities. Wind speed and ion mobility seem to be the
dominant factors, defining space-charge density profiles. A theoretical model
for the artificial electrode effect has been developed, taking into account
turbulent mixing of charged particles in the air flow with the logarithmic
profile of the wind velocity. The numerical analysis of the boundary value
problem for the two-dimensional equations for the light ion concentrations has
been performed. The model presented shows a qualitative agreement of calculated
space-charge profiles with measured ones, and explains the dependence of the
artificial electrode effect on the dominant control parameters. The limiting
conditions for the developed theory are discussed. |
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