巻号一覧
5 巻, 4 号
選択された号の論文の4件中1～4を表示しています
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I. Variations at Moderate Latitudes and the Equatorial Zone, and the Current System for the SD FieldSadami MATSUSHITA1953 年 5 巻 4 号 p. 109-135
発行日: 1954/01/30
公開日: 2010/09/14
ジャーナル フリーVariations in the densities and heights of the ionospheric Es and F2 regions during magnetic storms are studied. At the moderate latitudes in summer solstice and at the equatorial zone, the disturbance variation of the Es in both local time (SD) and storm time (Dst) is obtained by statistical examination, although the individual values of the Es data may not always be accurate.
The amplitude of the SD variation of the Es at the moderate latitudes is about 0.5Mc/s in frequency (15% for mean ionized density), and the phase of the variation seems to be opposite to that of the F2.
At the equatorial zone, the SD variations of the Es and the F2 regions and the Dst variation for f0F2 are rather peculiar for the phase, compared with those at the moderate latitudes. The geomagnetic SD variation at this zone is also a little different from that in the moderate latitudes.
On the other hand, the current system for the SD field is calculated by the dynamo theory, taking into consideration the anisotropic electrical-conductivity. A production mechanism of the Es is supposed, and the possibility that the ionospheric SD variations are due to the effect of a drift by the earth's magnetic field and the electric field of the SD current is discussed.抄録全体を表示PDF形式でダウンロード (3151K) -
Sekiko YOSHIDA, Yoshiko KAMIYA1953 年 5 巻 4 号 p. 136-140
発行日: 1954/01/30
公開日: 2010/09/14
ジャーナル フリーThe latitude effect of the cosmic-ray decrease associated with the magnetic storm was determined from the data obtained in 13 periods of observation at various stations over the world. The result was in accordance with Nagashima's electric field theory.抄録全体を表示PDF形式でダウンロード (509K) -
Kazuo NAGASHIMA1953 年 5 巻 4 号 p. 141-167
発行日: 1954/01/30
公開日: 2010/09/14
ジャーナル フリーThe variation of cosmic ray intensity by the static electric field surrounding the earth was calculated in a previous paper. In it a greater advantage was indicated in explaining the cosmic ray intensity decrease at the time of the magnetic storm by the electric field hypothesis than by the magnetic field hypothesis suggested by S. Chapman. In the present paper, the intensity variations of the ionizing and neutron components produced by the variation of the static electric field are calculated in detail extending over various altitudes and latitudes. By comparing these calculations with observations, it can be concluded that this electric field hypothesis is possible in explaining the phenomenon of the world-wide variations in intensity pointed out recently by various authors.
It may be possible that the diurnal variation of cosmic ray intensity can be produced by an electric field not derived from potential.抄録全体を表示PDF形式でダウンロード (3233K) -
T. NAGATA, S. AKIMOTO, S. UYEDA1953 年 5 巻 4 号 p. 168-184
発行日: 1954/01/30
公開日: 2010/09/14
ジャーナル フリーBesides the dacitic pumice of Mt. Haruna, an igneous rock having the tendency of self-reversal of thermo-remanent magnetization has been found in a pitchstone of Mt. Asio. Although the self-reversal property of the Asio ferromagnetic minerals is weaker than that of the Haruna ferromagnetic minerals, the magnetic and crystallographic properties of the former are fundamentally same as those of the latter.
By thermo-magnetic separation, an ensemble of ferromagnetic grains in both the Haruna and the Asio rocks were divided into A, B and AB groups. The results of thermo-magnetic measurement, chemical analysis, and X-ray analysis of these three groups showed that the A-constituent is a titanomagnetite of the crystal structure of inverse spinel type having the Curie-point at 430°-510°C, and the B-constituent is an ilmenite-hematite solid-solution of the rhombohedral crystal structure having the Curie-point at about 230°C, while the AB grains are composed of both A- and the B-constituents.
The measurement of thermo-remanent magnetization of a large number of single grain gave the result that only the AB grains can have the reverse thermo-remanent magnetization, the A- and the B- grains getting the ordinary normal thermo-remanent magnetization.抄録全体を表示PDF形式でダウンロード (4204K)
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