Physics
Scientific paper
Jan 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966jatp...28...53b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 28, no. 1, pp. 53-73
Physics
1
Scientific paper
Using filtration-type collectors with a sensitivity limit of 5 e cm-3 where e is the electronic charge the space charge density in fine or fair weather was recorded at 1 m, 2 m and 19 m, along with potential gradient at the ground, and wind speed and wet and dry bulb temperatures at various levels. Apparatus simultaneously converted the data into digital form on tape ready for feeding into a computer. Space charge concentrations were usually within the range ±400 e cm-3, and there was rarely any detectable difference between the values at 1 m and 2 m. At 19 m the space charge density was usually considerably greater than that at 1 m, and of the same sign as the potential gradient, and sometimes there were sudden changes of sign in the record of space charge at wind speeds below 1 m sec-1. These phenomena can be explained in terms of the electrode effect if this is regarded as the general modification of atmospheric electric elements due to the presence of any earthed body, or the Earth's surface itself, acting as an electrode. The results show that whereas direct measurements of space charge density near the bottom of a mast are satisfactory, near the top they may be unreliable in conditions of light wind or high potential gradient. Downwind of overhead electric power cables there is usually an excess of negative space charge during mist, sometimes persisting after the mist has cleared. Repetitive patterns in the courses of wind speed, temperature and humidity suggested that convection cells were moving past in the wind; the space charge records also showed these patterns.
Bent R. B.
Hutchinson C. A. W.
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