雷放電の研究（第2報） : 落雷に先行する放電

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書誌事項

タイトル別名
  • 雷放電の研究-2-
  • カミナリホウデン ノ ケンキュウ 2
  • STUDIES OF THE LIGHTNING DISCHARGES PART II. ON THE CLOUD DISCHARGE PRECEDING TO A GROUND STROKE

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説明

In this paper the beginning stage of a ground discharge is investigated mainly on the record of mill type field meter and the following results are obtained. It has reported by Clarence and Malan that a ground discharge usually has the "preliminary discharge" - the B field change according to their notation -, which takes place between negative charge in thundercloud and positive charge in lower part of it and leads to a return stroke. In more than 50% cases of the ground discharges recorded by authors observations, they each have a cloud discharge before the preliminary discharge. The cloud discharge neutralizes a part of main negative charge in the cloud and its duration is roughly within 500 ms. In some period of a thunder-storm, this type of ground discharge predominates over the cloud-discharge-less type, but in an other period of it, it reverses. It seems probable to infer that the cloud discharge discussed in this paper concerns a stage in a thunder-storm activity.

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