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- Issue 12 Pages 721-
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Volume 9 (1957)
- Issue 4 Pages 165-
- Issue 3 Pages 123-
- Issue 2 Pages 61-
- Issue 1 Pages 1-
Volume 9, Issue 2
Displaying 1-7 of 7 articles from this issue
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Seiya UYEDA1957 Volume 9 Issue 2 Pages 61-78
Published: 1957
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSThe thermo-remanent magnetism and the coercive force of the ilmenite-hematite solid solution (1-x) Fe2O3·xFeTiO3 have been examined for the range 0<x<0.7: in the range x>0.7, the solid solution is only paramagnetic at room temperature. The specimens are all synthesized ones. Measured quantities are J(T), Jr(T), Hc(T) and Hcr(T) for the maximum field of 800Oe. and the TRM [JT0Tc, H=2.0 oe.(T)]. The summarized results are as follows: In the parasitically ferromagnetic region (x<0.5), J(T) and Jr(T) show an increase below the Curie point, while Hc(T), and Hcr(T) decrease monotonously with temperature. Thermoremanent magnetism is strong in comparison with J(T) in this region, the Q-ratio amounting to several hundred. In the ferrimagnetic region (0.7>x>0.5), J(T) and Jr(T) show the typical straight decrease with temperature rise. Hc and the Q-ratio are quite smaller than for the parasitically ferromagnetic region. Remarkable reverse TRM like the Haruna-type one appears for the specimens of the range bordering the ferrimagnetic and parasitically ferromagnetic regions, namely the range 0.6>x>0.45. This indicates that the phenomenon is inherent to this substance and is closely related to the fundamental magnetic properties of this series. Furthermore, it was found that a definite tendency for reverse TRM appears for x≈0.1 that may be relevant to the natural reverse remanence of Adirondack rocks reported by Balsley and Buddington. Stability against the AC demagnetization and the field dependence of the thermo-remanent magnetism of this series have also been examined systematically.View full abstractDownload PDF (2079K) -
Robert R. BROWN1957 Volume 9 Issue 2 Pages 79-85
Published: 1957
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSObservations on the correlation of solar activity and cosmic radiation are reported. The relation of these results to models involving solar corpuscular streams is briefly conidered.View full abstractDownload PDF (752K) -
Hiroshi MAEDA1957 Volume 9 Issue 2 Pages 86-93
Published: 1957
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSIn Parts I and II ionospheric wind systems have been deduced from the geomagnetic Sq variations for the mean solstice. In order to compare our results with observation, however, it is still necessary to obtain the wind systems for the solstitial seasons. In this paper wind systems in summer and winter hemispheres are deduced from the Sq data. It is shown that the diurnal wind component has greater magnitude in summer than in winter; whereas the semi-diurnal component has smaller magnitude in summer than in winter over most of the hemisphere, and that in summer hemisphere the diurnal wind component is greater than the semi-diurnal one; whereas in winter hemisphere the former is more or less smaller than the latter. A comparison between our results and observed ionospheric winds is made.View full abstractDownload PDF (758K) -
III. Auroral LatitudesTeruo SATO1957 Volume 9 Issue 2 Pages 94-106
Published: 1957
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSA study is made, based on the electron drift theory, of ionospheric F2 disturbances in the auroal latitudes associated with geomagnetic storms. The process of the study is analogous to that in middle and lower latitudes as shown in the previous papers I and II. The results show that F2 disturbances in the auroral latitudes, as well as those in lower ones, are ascribed to the effect of the vertical drift of the electron caused by electric field deduced from the geomagnetic disturbance-daily variation.View full abstractDownload PDF (1513K) -
Susumu KATO1957 Volume 9 Issue 2 Pages 107-115
Published: 1957
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSHorizontal wind systems in the ionospheric E region are deduced along the same line as in a previous paper [1]. This time, however, the wind systems on both northern and southern hemispheres in the solstice season are obtained. The wind systems thus obtained represent the actual state instead of the mean state as in Part I and II [1] [3], in the solstice season. In Part IV the effect of the Coriolis force is taken into account and an advance is made in the treatment in Part III where the wind velocity is simply assumed to be irrotational [4].
It is shown, as in Part III, that in summer the diurnal wind motion is predominant over the semi-diurnal, whereas in winter the velocity of the former is almost the same as that of the latter. Further the diurnal wind velocity is greater in summer than in winter and the semi-diurnal wind velocity is somewhat smaller in summer than in winter.
Some differences are found between the results of Part III and IV. However, more observational material than available at present must be accumulated before discussing these differences,View full abstractDownload PDF (812K) -
Tôru SHIMIZU1957 Volume 9 Issue 2 Pages 116-118
Published: 1957
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSDownload PDF (180K) -
Hiroshi MAEDA1957 Volume 9 Issue 2 Pages 119-121
Published: 1957
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSDownload PDF (321K)
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