巻号一覧
3 巻, 3-4 号
選択された号の論文の8件中1～8を表示しています
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Syun-iti AKIMOTO1951 年 3 巻 3-4 号 p. 47-58
発行日: 1951年
公開日: 2010/03/12
ジャーナル フリーThe thermal change in susceptibility of ferromagnetic mineral grains separated from igneous rocks was measured by a ballistic method in a weak magnetic field. The thermal change of susceptibility was classified into four types. These types were discussed in connection with the condition under which the original rock was formed. The dependency of the Curie-point and the magnitude of the susceptibility upon the chemical constitution was examined, the content of TiO2 in ferromagnetic mineral being especially taken into account. Besides, the relation between the magnitude of susceptibility and the grain size was obtained from the viewpoint of the magnetic property of small particles.抄録全体を表示PDF形式でダウンロード (1004K) -
Naoshi FUKUSHIMA1951 年 3 巻 3-4 号 p. 59-76
発行日: 1951年
公開日: 2010/03/12
ジャーナル フリーIn this study, the progressive change in the current system for the bay disturbance was chiefly examined in four examples with the aid of the world-wide magnetogram copies. The average current system corresponding to the maximum stage of the bay disturbance, which is given in Fig. 3, can be approximated as a result of the dynamo-theoretical calculation under the assumption on the distribution of the electric conductivity in the upper atmosphere such as that the ratio of the conductivity in the auroral zones to that i n the equatorial region is about 14 in the dark hemisphere and about 4 in the sunlit hemisphere. The development and decay processes of individual bay disturbances are not a simple intensification and diminution of the mean current system such as given in Fig. 3, It was noticed that the westward auroral zone current in the dark hemisphere seems to become most intense nearly at the same time when the disturbance force at most part of lower latitude regions reaches its maximum magnitude, and the eastward auroral zone current in the sunlit hemisphere does not yet fully develope by that time and becomes most intense a few tens minutes later.抄録全体を表示PDF形式でダウンロード (2148K) -
Ken-ichi MAEDA1951 年 3 巻 3-4 号 p. 77-89
発行日: 1951年
公開日: 2010/03/12
ジャーナル フリーThe paper deals with the possibility that the ionospheric electron density is affeted by the flow of the charged particles (electrons, negative and positive ions) associated with the atmospheric mass motion and dynamo current from dynamo-theoretical aspect. The theoretical relationships among the electron density, atmospheric motion and dynamo current are deduced and some numerical examples as applied to the F2-layer are given. The effect of dynamo current is small in comparison to that of atmospheric mass motion, which must account for the dynamo current corresponding to the Sq field of geomagnetic variation.抄録全体を表示PDF形式でダウンロード (1290K) -
Teruo SATO1951 年 3 巻 3-4 号 p. 90-99
発行日: 1951年
公開日: 2010/03/12
ジャーナル フリーIn this paper we calculate the virtual height of the reflection point of a radio wave incident in the ionosphere at a frequency of 0.834fc, where fc is the critical frequency of the ionosphere, in the presence of the earth's magnetic field. We also calculate the magnitude of the retardation of the wave resulting from the transmission in the lower ionized layer. In these calculations, we take three cases that the inclination of the magnetic field vector respectively is 0°, 30° and 90°. It is found that the virtual height of the reflection point of the wave at a frequency of 0.834fc, which is equal to the actual height of the ionosphere in the case of no magnetic field, does not indicate the actual height in the presence of the earth's magnetic field, and the value of the retardation depends on y, which is the ratio of the gyro-frequency to the wave frequency, and on f1/f2, where f1 and f2 are the critical frequency of the lower and upper ionized layers respectively.
Further, it is also found that the effect of the earth's magnetic field on both virtual height and retardation is maximum, when the inclination of the earth's magnetic field vector is 0°, that is, on the magnetic equator; and minimum when the inclination is 90°, that is, on the magnetic pole.抄録全体を表示PDF形式でダウンロード (1028K) -
Kazuo NAGASHIMA1951 年 3 巻 3-4 号 p. 100-116
発行日: 1951年
公開日: 2010/03/12
ジャーナル フリーMany investigators made various attempts which were calculated to explain the decrease of cosmic ray intensity during a magnetic storm in the maguetic field of the ring current, suggested by S. Chapman.Unfortunately their results seemed to contain many qualitative faults.
In this paper, I do not try to search for the cause of the decrease in the magnetic field, but in the electric field, connected with the magnetic storm. From such a standpoint, the shape of the westward current system which is appropriate to account for the cosmic ray phenomena during the maguetic storm, is discussed. Qualitatively, the results, obtained, seem to be adequate enough to explain quite reasonably the observed phenomena of cosmic rays, although, quantitatively, there still remain somewhat questionable points.
In this paper, I also discuss relative merits between the magnetic field hypothesis and this electric one.抄録全体を表示PDF形式でダウンロード (1797K) -
H. Takeuchi, Y. Shimazu1951 年 3 巻 3-4 号 p. 117-118
発行日: 1951年
公開日: 2010/03/12
ジャーナル フリーPDF形式でダウンロード (196K) -
Sadami MATSUSHITA1951 年 3 巻 3-4 号 p. 119-120
発行日: 1951年
公開日: 2010/03/12
ジャーナル フリーPDF形式でダウンロード (209K) -
1951 年 3 巻 3-4 号 p. e1
発行日: 1951年
公開日: 2010/03/12
ジャーナル フリーPDF形式でダウンロード (68K)
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