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Volume 32 (1980)
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Volume 14 (1962 - 196･･･
- Issue 4 Pages 177-
- Issue 3 Pages 133-
- Issue 2 Pages 71-
- Issue 1 Pages 1-
Volume 14, Issue 2
Displaying 1-6 of 6 articles from this issue
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Kazuhiko TAO1962 Volume 14 Issue 2 Pages 71-85
Published: 1962
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSFrom several experiments carried out in the Far East and in South America, a statistical study is described on a relationship between the occurrences of F scatter and spread F. The theoretical aspect of the reflection mechanism of F scatter is treated from the standpoint of a field-aligned scattering blob. Moreover, blobs of ionization which have a longitudinal scale of the order of several hundred meters and a transverse scale of several meters are considered to be responsible for F scatter propagation. In the last part of this paper, possibility of F scatter is discussed from a geomorphological point of view.View full abstractDownload PDF (1867K) -
Part II Chorus Increases and Geomagnetic Pulsations at the Auroral ZoneTadanori ONDOH1962 Volume 14 Issue 2 Pages 86-98
Published: 1962
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSA close relation has been found between increases of chorus indices continuing for a few hours and geomagnetic pulsations at the auroral zone, using the chorus indices and rapid-run magnetograms at College, Alaska, during July, 1959 to December, 1960.
During this period 79 increases of chorus indices occurred in relatively quiet geomagnetic-conditions after geomagnetic bay-like disturbances. Of 79 chorus increases, 52 were associated with geomagnetic pulsations with periods between 1 and 6 minutes and 11 were associated with pulsations having periods of about 30 seconds.
The chorus increases may be generated by penetration of high speed charged particles into the exosphere, which may also be related to the geomagnetic pulsations.
A possible mechanism of the generation of geomagnetic pulsation has been discussed.View full abstractDownload PDF (1277K) -
Takesi Nagata1962 Volume 14 Issue 2 Pages 99-106
Published: 1962
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSA mathematical formula representing the resultant magnetic moment of detrital remanent magnetization (DRM) of sediments, originally proposed by the writer, is revised based on a more reasonable assumption. Using the revised expression, the inclination error of DRM is satisfactorily interpreted as due to the effect of the spheroidal form of magnetized particles in the sediments.View full abstractDownload PDF (767K) -
M. Sawada, M. Ozima, Y. Fujiki1962 Volume 14 Issue 2 Pages 107-112
Published: 1962
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSA study has been made of the magnetic properties of cubanite (CuFe2S3). It was found that the saturation magnetization of orthorhombic cubanite at room temperature was 0.87emu/gram. An irreversible change revealed in a thermomagnetic curve at about 270°C was identified as a polymorphic transition from an orthorhombic to a cubic structure by X-ray analyses, chemical analysis and microscopic observation. It is further suggested from the result on differential thermal analysis that the polymorphic transition is of an order-disorder type, which results in a marked decrease of the magnetization at this temperature.View full abstractDownload PDF (621K) -
Y. SYONO, S. AKIMOTO, T. NAGATA1962 Volume 14 Issue 2 Pages 113-124
Published: 1962
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSThe field dependence of thermo-remanent magnetization (TRM) and isothermal remanent magnetization (IRM) of single crystals of ferromagnetic substances such as natural samples of hematite, pyrrhotite, and magnetite and synthetic samples of orthoferrite (YFeO3), magnesioferrite (MgFe2O4), and yttrium iron garnet (YIG) was studied.
It was confirmed for all the specimens that the characteristics of TRM are kept in their fairly large single crystals. The production of TRM was most effective in those crystals having strong magnetic anisotropy, especially in parasitic ferromagnetic substances such as hematite and YFeO3, for which an applied magnetic field of only several Oersteds is strong enough to produce almost saturated TRM. The saturation value of TRM is nearly the same as its spontaneous magnetization. For cubic crystals such as magnetite, magnesioferrite and YIG, the value of JTc/Js, which may represent a degree of fixing of TRM, was only 10-3 at most, though TRM was definitely distinguished from IRM even in this case. Anisotropy of remanent magnetization into various crystal axes was also examined for every specimen.
These experimental results may be interpreted as follows. In the case of a single crystal carefully prepared the acquisition of TRM is subject mostly to the magnetocrystalline anisotropy. The larger the magnetocrystalline anisotropy is and the smaller the spontaneous magnetization is, the larger becomes the intensity of TRM.
Structures of magnetic domains of magnesioferrite in various stages of magnetization were observed with the aid of the Faraday effect in order to study the fixing mechanism of TRM.View full abstractDownload PDF (2925K) -
T. NAGATA, T. OGUTI1962 Volume 14 Issue 2 Pages 125-131
Published: 1962
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSDownload PDF (693K)
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