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Pages 104-106

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From page 104...
... A totally different approach for determining the storm currents would involve measuring the pattern of magnetic fields that they produce. This approach has not been feasible owing to the difficulty of measuring the weak fields and to the presence of the geomagnetic field, but such an approach may become practical in the future.
From page 105...
... Although highly variable, intracloud lightning generally outnumbers cloud-to-ground lightning in a storm, often by a factor of 5 or 10 to 1 or so, and it is of interest to ask why this happens. The charging process establishes the main negative and upper positive charges as the primary charges of the storm, and this may cause the electric field to be stronger above the main negative charge than below it.
From page 106...
... This result, which is illustrated in Figure 8.5, suggests that the negative-charge sources for the lightning coincided with main negative charge in the storm. The question of how the lightning and storm charges are related has also been investigated by studying the


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