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    RAINDROP ELECTRIFICATION BY THE ASSOCIATION OF RANDOMLY CHARGED CLOUD DROPLETS

    Source: Journal of Meteorology:;1955:;volume( 012 ):;issue: 006::page 562
    Author:
    Gunn, Ross
    DOI: 10.1175/1520-0469(1955)012<0562:REBTAO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Light ions generated in the atmosphere by cosmic rays and radioactivity normally diffuse onto cloud droplets and establish a nearly symmetrical Gaussian distribution of positively and negatively charged droplets. When the cloud becomes unstable, these cloud elements grow by association and the charges accumulate to establish a new equilibrium consisting of nearly equal numbers of larger and highly charged positive and negative cloud droplets. Growing raindrops or graupel falling through such a cloud are accordingly bombarded by both positive and negative droplets, and this establishes a statistical accumulated charge on the various drops. The distribution of the number of drops in relation to the sign and magnitude of the free charge is worked out from basic principles and shown to agree remarkably well with the magnitude and distribution of drop charges measured inside precipitating clouds. The mean drop charge, irrespective of sign, depends on the square root of the drop size and kinetic energy of the small droplets relative to the larger moving drops. An equipartition is established between the electrical potential energy carried by the larger drops and the relative kinetic energy of the smaller drops. The estimated drop charges on warm rain or graupel are sufficiently large to account for thunderstorm phenomena, provided only that some unspecified process systematically separates the positively and negatively charged drops. The charges produced at the rain forming level commonly approximate 50 electrostatic units per gram. The observed electrification of quietly falling rain is primarily a manifestation of the ionization produced in the atmosphere by radioactivity and cosmic rays.
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      RAINDROP ELECTRIFICATION BY THE ASSOCIATION OF RANDOMLY CHARGED CLOUD DROPLETS

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4149754
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    contributor authorGunn, Ross
    date accessioned2017-06-09T14:11:20Z
    date available2017-06-09T14:11:20Z
    date copyright1955/12/01
    date issued1955
    identifier issn0095-9634
    identifier otherams-14217.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4149754
    description abstractLight ions generated in the atmosphere by cosmic rays and radioactivity normally diffuse onto cloud droplets and establish a nearly symmetrical Gaussian distribution of positively and negatively charged droplets. When the cloud becomes unstable, these cloud elements grow by association and the charges accumulate to establish a new equilibrium consisting of nearly equal numbers of larger and highly charged positive and negative cloud droplets. Growing raindrops or graupel falling through such a cloud are accordingly bombarded by both positive and negative droplets, and this establishes a statistical accumulated charge on the various drops. The distribution of the number of drops in relation to the sign and magnitude of the free charge is worked out from basic principles and shown to agree remarkably well with the magnitude and distribution of drop charges measured inside precipitating clouds. The mean drop charge, irrespective of sign, depends on the square root of the drop size and kinetic energy of the small droplets relative to the larger moving drops. An equipartition is established between the electrical potential energy carried by the larger drops and the relative kinetic energy of the smaller drops. The estimated drop charges on warm rain or graupel are sufficiently large to account for thunderstorm phenomena, provided only that some unspecified process systematically separates the positively and negatively charged drops. The charges produced at the rain forming level commonly approximate 50 electrostatic units per gram. The observed electrification of quietly falling rain is primarily a manifestation of the ionization produced in the atmosphere by radioactivity and cosmic rays.
    publisherAmerican Meteorological Society
    titleRAINDROP ELECTRIFICATION BY THE ASSOCIATION OF RANDOMLY CHARGED CLOUD DROPLETS
    typeJournal Paper
    journal volume12
    journal issue6
    journal titleJournal of Meteorology
    identifier doi10.1175/1520-0469(1955)012<0562:REBTAO>2.0.CO;2
    journal fristpage562
    journal lastpage568
    treeJournal of Meteorology:;1955:;volume( 012 ):;issue: 006
    contenttypeFulltext
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