巻号一覧
25 巻, 3 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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D. K. BAMGBOYE1973 年 25 巻 3 号 p. 237-247
発行日: 1973年
公開日: 2010/03/12
ジャーナル フリーSome results of “dispersion” analysis of F-region drift data obtained at Ibadan (dip 6°S) are presented. On a number of occasions marked dispersion involving a velocity variation of about 60 msec-1 or more from low to high fading frequencies has been found. The results suggest that in the “correlation” analysis the “apparent” velocity probably measures the motion better than the “true” velocity, whether or not dispersion is present. It is also found that the motions occurring at this latitude are not always in the east-west direction. Occasionally, two independent motions corresponding to different fading frequency ranges and moving at right angles to each other may be involved.抄録全体を表示PDF形式でダウンロード (1096K) -
Akira SUZUKI1973 年 25 巻 3 号 p. 249-258
発行日: 1973年
公開日: 2010/03/12
ジャーナル フリーA distribution of return currents of the equatorial electrojet was calculated by solving the partial differential equation, div Je=0, under the condition of non-uniform distribution of ionospheric conductivity and the boundary condition at the equator which was deduced from ground magnetic variations. It is found that the return currents decrease rather quickly with increasing distance from the equator. Comparing the distribution of the return currents with that of the Sq currents, it is concluded that the contributions of the return currents to the ground magnetic variations are mostly less than ten and rarely twenty per cent of those of the Sq currents, at any point except in small areas just under the current vortices.抄録全体を表示PDF形式でダウンロード (886K) -
Akira SUZUKI1973 年 25 巻 3 号 p. 259-280
発行日: 1973年
公開日: 2010/03/12
ジャーナル フリーThe geomagnetic solar quiet daily variation field, Sq, was analyzed by a new method and the result was compared with that of MATSUSHITA and MAEDA (1965). The new method is intended to avoid errors which occur in harmonic analysis due to the equatorial electrojet of narrow latitudinal width; the magnetic effect originating from equatorial electrojet currents is temporarily omitted until after the spherical harmonic analysis has been performed, and later the effect is added in. Compared with the results obtained by Matsushita and Maeda, it is found that: (1) Spherical harmonic coefficients for the Sq field generally become smaller. (2) Magnitude of the equivalent current systems external to the earth diminishes by 10-20 per cent. (3) The coefficients which are mainly responsible for the jet effect are a16, a110, b16, b110, a27, a211, etc.; they become considerably smaller. In many of these terms the amplitude ratio Emn/Imn of the external to the internal part also becomes smaller. (4) The amplitude ratios, Emn/Imn, for main terms become larger.抄録全体を表示PDF形式でダウンロード (1903K) -
Satio HAYAKAWA, Koji ITO, Toshio MATSUMOTO, Tetsuo NISHIMURA1973 年 25 巻 3 号 p. 281-296
発行日: 1973年
公開日: 2010/03/12
ジャーナル フリーTwilight airglow emissions in the wavelength ranges at about 1.3μm, 1.7μm and 2.2μm were observed by a rocket-borne photometer. The heights of the airglow layers and the local times at emission regions were derived taking into account the roll, precession and altitude of the rocket. The volume emission rates in these three bands were peaked at about 73km. The mean lifetime of the O2(1Δg) molecules was obtained to be 33±2 minutes from the time variation of the airglow intensity in the 1.3μm band. This is accounted for in terms of a combination of the spontaneous decay and the collisional deexcitation. The rate constant for the latter is about a half of that obtained in laboratory measurements at room temperature.抄録全体を表示PDF形式でダウンロード (1312K) -
Takashi OKUZAWA, Kaoru YAMANAKA1973 年 25 巻 3 号 p. 297-312
発行日: 1973年
公開日: 2010/03/12
ジャーナル フリーA numerical study is made on the ducted-whistler propagation in the magnetosphere by using the phase-integral technique. The guidance in the present model takes place along a dipole field-aligned irregularity with a slowly varying, quartic distribution of ionization density. Numerical calculations are made on the track widths, the mode angles, and the travel times of trapped modes for a wide range of irregularity parameters. Calculations are carried out for a field line for which the shell parameter L=2, Angerami and Thomas's model of ionization density being employed as a background component of the plasma distribution. It is shown that an increase in the transverse size of irregularity may not be responsible for the increase in whistler diffuseness.抄録全体を表示PDF形式でダウンロード (1426K) -
Masayoshi MAMBO, Isamu NAGANO1973 年 25 巻 3 号 p. 313-323
発行日: 1973年
公開日: 2010/03/12
ジャーナル フリーElectromagnetic fields of a wave propagating in the ionospheric D region with its wave normal directing vertically upwards can be described by the Weber function. The model ionosphere pertinent to the present investigation is composed of the parabolic electron density profile with a constant collision frequency and the vertical magnetic field. The distribution of wave electric field intensity, reflection, transmission and conversion coefficients are numerically calculated. It is shown that the reflection coefficient for the right handed circularly polarized wave has a spirally diminishing characteristic in the amplitude-phase polar coordinate plane for increasing wave frequency. The left handed circularly polarized wave is reflected below the altitude where the wave frequency approaches to the penetration frequency. It is also found that the conversion coefficient of the transmitted wave decreases abruptly above a specific value of collision frequency.抄録全体を表示PDF形式でダウンロード (741K) -
Takehiko Aso1973 年 25 巻 3 号 p. 325-330
発行日: 1973年
公開日: 2010/03/12
ジャーナル フリーA complex impedance of a negative cylindrical probe in a magnetoplasma is calculated using a gradient sheath model, and quantitative values of the sheath resonance frequency for a floating probe are determined for various values of plasma parameters. Calculated results are in good agreement with the experimental data of a rocket borne impedance probe.抄録全体を表示PDF形式でダウンロード (357K) -
E. E. LARSON, D. E. WATSON, J. M. HERNDON, M. W. ROWE1973 年 25 巻 3 号 p. 331-338
発行日: 1973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 (709K)
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