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Probing Clouds' Roles In Global Electric Circuit

Date:
May 31, 2009
Source:
American Geophysical Union
Summary:
A semicontinuous current flow has been measured above electrified clouds. Called the Wilson current, this phenomenon has long been considered a critical component of the global electric circuit; however, only a few studies have directly investigated this current, yielding only a few dozen measurements.

A semicontinuous current flow has been measured above electrified clouds. Called the Wilson current, this phenomenon has long been considered a critical component of the global electric circuit; however, only a few studies have directly investigated this current, yielding only a few dozen measurements.

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Reporting in the Journal of Geophysical Research-Atmospheres, Mach et al. greatly expanded on this sparse collection of measurements. Using conductivity and electric field sensors mounted on high-altitude aircraft, they determined current densities along 850 overflights of electrified clouds.

Using these data, which represent more than a decade of observations of land-based and oceanic storms, the authors estimate the Wilson current for each of the clouds overflown. They find that one third of the clouds studied did not have lightning yet still generated significant Wilson currents, confirming that such "shower" clouds do play a critical role in the global electric circuit.

They also find that 7 percent of storms produced current flows that were opposite in polarity from the typical thunderstorms, diminishing the contribution storms make to the global electric circuit.

The results of this paper will contribute to a better understanding of the global electric circuit.


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Journal Reference:

  1. Mach, D. M., R. J. Blakeslee, M. G. Bateman, and J. C. Bailey. Electric fields, conductivity, and estimated currents from aircraft overflights of electrified clouds. Journal of Geophysical Research, 2009; 114 (d10): D10204 DOI: 10.1029/2008JD011495

Cite This Page:

American Geophysical Union. "Probing Clouds' Roles In Global Electric Circuit." ScienceDaily. ScienceDaily, 31 May 2009. <www.sciencedaily.com/releases/2009/05/090529135535.htm>.
American Geophysical Union. (2009, May 31). Probing Clouds' Roles In Global Electric Circuit. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2009/05/090529135535.htm
American Geophysical Union. "Probing Clouds' Roles In Global Electric Circuit." ScienceDaily. www.sciencedaily.com/releases/2009/05/090529135535.htm (accessed October 31, 2014).

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