巻号一覧
6 巻, 2 号
選択された号の論文の4件中1～4を表示しています
- |<
- <
- 1
- >
- >|
-
H. MATSUZAKI, K. KOBAYASHI, K. MOMOSE1954 年 6 巻 2 号 p. 53-56
発行日: 1954/10/31
公開日: 2010/03/12
ジャーナル フリーThe natural remanent magnetism of the andesitic lava of Mt. Utsukushi-ga-hara in the Central Part of Japan, showes that both its intensity and direction are too scattered to be considered as normal. This anomalous magnetisation is supposed to come from the magnetisation owing to the momentary strong magnetic field afforded by thunderbolts. The writers have measured the relations between the demagnetisation and magnetisation of samples in a strong magnetic field. The result seems to support their assumption.抄録全体を表示PDF形式でダウンロード (398K) -
Tatsuzo OBAYASHI1954 年 6 巻 2 号 p. 57-67
発行日: 1954/10/31
公開日: 2010/03/12
ジャーナル フリーThe world-wide patterns of the F2-region disturbance and their development process with the geomagnetic storm-time were examined with the comprehensive world-wide data of F2-layer.
The average disturbance in f0F2 during the main phase of the associated magnetic storm, so-called D (f0F2), was derived with respect to geomagnetic latitude and local-time, and it was separated into the Dst (f0F2) and Ds (f0F2) component. It will be shown in this analysis these two components play an important role in the ionospheric storms, and not only their range, but also their phase are controlled by the magnetic activity.
The average development course of the ionospheric storm and the mode of the Ds (f0F2), changing regularly with storm-time, were studied. The phase of the Ds (f0F2) during the active stage of magnetic storm is almost uniquely dependent upon local-time, but after the activation ceases, the pattern of the disturbance moves together with the rotating earth.
Detailed analysis was made on the progressive aspects of the individual disturbances in the northern hemisphere accompanied with some typical severe magnetic storms.抄録全体を表示PDF形式でダウンロード (1374K) -
Tatsuo SHIMAZAKI1954 年 6 巻 2 号 p. 68-82
発行日: 1954/10/31
公開日: 2010/03/12
ジャーナル フリーChapman's ion-production function in an isothermal ionosphere is first reformed for the convenience of applying it to the ionosphere with the temporal variation of temperature. Then using this ionization function, the equation of motion and the equation of continuity are solved, taking both the thermal- and tidal- variations into account. As a result, the maximum electron density and its corresponding height can be obtained for each hour during a day. Departures of these from the norm of the static Chapman region indicate that the behaviour of this departure Δnm is very different from that by Weiss [6], who deals only with tidal effect on the ionosphere. In our case it is inversely proportional to the temperature variation in the course of a day except in the morning when the electron density is very small. It is also noted that the semidiurnal variation in Δnm appears even in the case of taking into account only the diurnal variation in temperature but not the tidal variation. As regards the behaviour of Δhm, the result similar to Weiss' can be seen, but with the reasonable difference that it is much raised and lowered by thermal expansion and contraction in the afternoon (high temperature) and in the morning (lower temperature), respectively. Further, the effect of temperature variation and tidal one exerted simultaneously on the daily variations in the maximum electron density and its height seem to show the complicated mutual interaction between these two effects.抄録全体を表示PDF形式でダウンロード (1298K) -
Masaziro OTA1954 年 6 巻 2 号 p. 83-98
発行日: 1954/10/31
公開日: 2010/03/12
ジャーナル フリーThe average feature of the geomagnetic diurnal-variation is conventionally described by the Fourier coefficients. Camparing these coeffs. of quite days and with those of all days, the characteristics of the Sq-variation are discussed. It is recognized that at the middle and the low latitudes the amount of variation on quite days is large during the day-time and negligible during the night. If we plot a scheme which varies during the day-time and not during the night, then the average feature of the Sq-variation bears a striking resemblance to this scheme. The feature of this scheme is derived from the Fourier coeffs. computed by the conventional method, and their latitudinal distributions are clarified by using a peculiar latidude. Moreover, this scheme is very satisfactory with the potential.抄録全体を表示PDF形式でダウンロード (1460K)
- |<
- <
- 1
- >
- >|