Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
12 巻, 1 号
選択された号の論文の5件中1~5を表示しています
  • Toshio OGAWA
    1960 年 12 巻 1 号 p. 1-12
    発行日: 1960年
    公開日: 2010/09/14
    ジャーナル フリー
    In order to eliminate short-period fluctuations due to local effects, daily courses of potential gradient, conductivity and air-earth current were smoothed out by taking hourly overlapping means of 5 hours and the interrelationship between each element was examined on every day. In urban district, the production of man-made nuclei begins following human activity in the early morning before sunrise and they accumulate in the lowest stable layer of the exchange layer. In the daytime, when the wind rises, the nuclei are transported into the upper layers in the exchange layer by vertical turbulent mixing due to forced convection, and there diffused out horizontally. The eliminated short-period fluctuations are on the average 27% of the concerned elements. Examining diurnal variations of the fluctuations, there is neither evidence that they are caused by local generators other than the thunderstorm generator nor evidence that they are directly connected to strength of turbulence of the air.
  • Kunitomo SAKURAI
    1960 年 12 巻 1 号 p. 13-20
    発行日: 1960年
    公開日: 2010/09/14
    ジャーナル フリー
    It was temporarily thought that the disagreement of the position of geomagnetic dipole equator with that of the cosmic ray equator would be caused by 45° westward shifting of the latter. At first, we examine, referring to the theory of geomagnetic effect on cosmic rays, whether such westward shifting can be existent or not. It is shown, in view of this examination, that the deviation of the cosmic ray equator from the geomagnetic dipole equator is negligible even if the magnetic cavity is present around the earth's outer atmosphere. Taking into account such results, we investigate the origin of the cosmic ray equator and show that this equator can be produced by the higher harmonic components combined with the dipole component of geomagnetism. We then consider the relation of the origin of the cosmic ray equator to the eccentric dipoles, near the outer part of the earth's core, contributing to the secular variation of geomagnetism.
  • Toshio OGAWA
    1960 年 12 巻 1 号 p. 21-31
    発行日: 1960年
    公開日: 2010/09/14
    ジャーナル フリー
    The continuous observations of the rain current (i), the rate of rainfall (R′) and the potential gradient (P) were made. Providing the Wilson's theory of ion capture by water drops, the quantitative representation between them is obtained using the size-distribution of raindrops by Marshall and Palmer as
    i=2.12×10-6PhR′0.84-0.54×10-6PhR′1.05,
    where i gives the maximum rain current and Ph is the potential gradient in the charging region of raindrops below the clouds. Applying the calculated result to the measured ones, it is found that Ph relates to P by |Ph|=3P1.3 The relation between the above results and the Simpson's empirical ones is discussed. Further, some results in regard to the splashing effect of raindrops at the ground and to the mirror-image effect between the rain current and the potential gradient are described.
  • Tadanori ONDOH, Syoichiro HASHIZUME
    1960 年 12 巻 1 号 p. 32-37
    発行日: 1960年
    公開日: 2010/09/14
    ジャーナル フリー
  • 1960 年 12 巻 1 号 p. 38-57
    発行日: 1960年
    公開日: 2010/09/14
    ジャーナル フリー
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