巻号一覧
12 巻, 3 号
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Tomikazu NAMIKAWA1961 年 12 巻 3 号 p. 117-128
発行日: 1961年
公開日: 2010/09/14
ジャーナル フリーWe are interested in the manner of propagation of hydromagnetic waves in the Earth's upper atmosphere. The density changes continuously in the atmosphere and the steady magnetic field is a dipole field, but we discuss here the laws of reflection and refraction of hydromagnetic waves at a plane boundary between two semi-infinite homogeneous media of anisotropic electrical conductivity under a uniform steady magnetic field. When the steady magnetic field is perpendicular to the boundary plane, the laws of reflection and refraction are simple, but when the steady magnetic field makes an angle with the plane, they are complicated. The incident ordinary (or extraordinary) waves may be reflected or refracted as the ordinary or extraordinary waves and propagate anisotropically.抄録全体を表示PDF形式でダウンロード (736K) -
Akira OKAWATI1961 年 12 巻 3 号 p. 129-137
発行日: 1961年
公開日: 2010/09/14
ジャーナル フリーThe simultaneous and continuous observations of atmospheric electric potential gradient were made at several stations in Kyoto City which has about one million population. The diurnal variations in calm days were observed, and the characteristic diurnal variation in Kyoto City as well as the locality within some kilometres were clarified. The diurnal variation at Iwakura 6km apart from the centre of the city had quite a different type from the stations near the centre. The station 5km. apart from the centre had a diuranal variation partly influenced by the centre. And the station 4km. apart from the centre and about 120 metres higher than the others had the different feature from others.抄録全体を表示PDF形式でダウンロード (872K) -
Shunyo SAGA, Toshio OGAWA1961 年 12 巻 3 号 p. 138-147
発行日: 1961年
公開日: 2010/09/14
ジャーナル フリーOn the discussion of the charge on rain drop, there remains a serious problem on the electric field below cloud, that is the discrepancy between the Altielectrograph results by Simpson and Scrase and Simpson and Robinson and the theoretical calculation by Whipple and Scrase on the basis of Wilson's Space-Charge Theory. Taking the life time of small ions into consideration, it was found that there is the possibility of rapid increase of the field intensity below the level of 100m above the earth's surface; the magnitude at that level is about ten times as large as that at the earth's surface. This rapid increase may have caused the erroneous estimation of the coefficient in the relation between the electric current through the sounding apparatus and the field intensity used by Simpson and Scrase, and so the above discrepancy may have arisen.抄録全体を表示PDF形式でダウンロード (1032K) -
Kazuo KOBAYASHI1961 年 12 巻 3 号 p. 148-164
発行日: 1961年
公開日: 2010/09/14
ジャーナル フリーMagnetization-blocking process in chemical remanent magnetization was demonstrated through the size development of ferromagnetic precipitates generated by an aging of Cu-Co alloy, the magnetic behaviour of which changes from superparamagnetic to stable single domain and then to multidomain one, according to the increase in the size of the precipitates. It has been shown that a remanent magnetization is acquired during the transition from a superparamagnetic to stable ferromagnetic state and that the remanent magnetization thus obtained decreases as a result of the formation of domain walls if the size of the precipitates exceeds the critical single domain grain size. The result can be well explained by Néel's thermal fluctuation theory of single domain grains and the domain structure theory of ferromagnetics. The particle sizes at various stages of aging were estimated by different granulometry methods with roughly consistent results. The general idea confirmed in the present study has been successfully extended to the CRM phenomena in synthetic and natural ferromagnetic minerals. It was suggested that specimens produced by low temperature chemical changes can be classified into four groups, i.e. the superparamagnetic stage, magnetically-stable single domain stage, the transient stage from single domain to multidomain structure and the perfectly developed multidomain stage from the view-point of the nucleation of ferromagnetic minerals. The magnetic behaviour of several specimens already reported can be consistently interpreted on the basis of the present experiment.抄録全体を表示PDF形式でダウンロード (1728K) -
1961 年 12 巻 3 号 p. 165-169
発行日: 1961年
公開日: 2010/09/14
ジャーナル フリーPDF形式でダウンロード (751K)
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