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Volume 12 (1960 - 196･･･
- Issue 4 Pages 171-
- Issue 3 Pages 117-
- Issue 2 Pages 59-
- Issue 1 Pages 1-
Volume 12, Issue 4
Displaying 1-6 of 6 articles from this issue
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Yoshihito TAKESADA1961 Volume 12 Issue 4 Pages 171-174
Published: 1961
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSThe sound channel will be formed in accordance with the wind current and temperature distribution. When the sound ray has the same direction of the propagation with the jet stream, the velocity minimum in the vertical distribution of the sound velocity exists on about 23km in height. And if the sound ray radiating from the ground, it is refracted at about 13km in height and then comes back to the ground. When the sound ray has opposite direction to wind stream, the velocity minimum of the vertical sound velocity distribution will occur at the altitude of 12km.View full abstractDownload PDF (404K) -
I. Atmospheric Temperature EffectTaiichi KITAMURA, Masahiro KODAMA1961 Volume 12 Issue 4 Pages 175-180
Published: 1961
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSCosmic ray observations at Syowa Base, Antarctic, have been carried out by using a Neher type ionization chamber during 1957 and a cubical meson telescope since 1959, respectively.
The atmospheric temperature effect on cosmic ray intensity thereby obtained has been investigated mainly in terms of annual change of cosmic ray diurnal variation. The results obtained are as follows:
1) Annual change of cosmic ray diurnal variation is far more remarkable in the Antarctic region than in the moderate latitude.
2) The best correlation between cosmic ray intensity and isobar level height is found at 50mb in the Antarctic while at 300mb in the moderate latitude.
3) The amplitude of diurnal variation of 50mb isobar level height at Syowa Base is estimated from the cosmic ray data at about 12 meters in summer and about 7 meters in winter, respectively.View full abstractDownload PDF (503K) -
Akira OKAWATI1961 Volume 12 Issue 4 Pages 181-189
Published: 1961
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSOn the summit of Mt. Hiei (860m) in Kyoto, as well as at the Geophysical Institute of Kyoto University (70m) the simultaneous and continuous measurements of atmospheric electric potential gradient were made in the period from December 1955 to March 1956, and the characteristic of the diurnal variation of the atmospheric electric potential gradient on the summit of the mountain in winter season was studied. For the purpose of more precise investigation, the measurements were made again in the period from February 1959 to February 1960. Both the diurnal and the seasonal variations were clarified. On the summit of Mt. Hiei, even in winter, the diurnal variation was not similar to that over the ocean—unitary variation—, not like that on the Alps and Mt. Fuji, but it was affected by lower atmosphere in daytime. It was found that the mean value of the potential gradient on Mt. Hiei was greater in summer than in winter contrary to that at the Geophysical Institute.View full abstractDownload PDF (848K) -
Sadao SASAJIMA1961 Volume 12 Issue 4 Pages 190-215
Published: 1961
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSγ-hematites with titanium (called for the sake of convenience in this paper γ-titanohematite) were extracted from natural rocks. And the chemical, crystallographic and magnetic properties were investigated. The occurrence of this ferromagnetic mineral is also discussed and the contribution of this mineral to the natural remanent magnetism of the rocks is described.View full abstractDownload PDF (6625K) -
Shin FUKUSHIMA, Masahiro KODAMA, Yukihiko MURAISHI1961 Volume 12 Issue 4 Pages 216-221
Published: 1961
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSCosmic ray neutron dada obtained at Syowa Base, Antarctic, are analyzed for studies on characteristics of the four cosmic ray unusual increases, which occurred on May 4, 1960 and during November 1960, by comparing with cosmic ray data from the other stations in the polar regions. Investigations of the enhanced intensity, the onset time and the decay time of the cosmic ray increase give definite differences between the northern and the southern polar regions, differing from event to event. Such differences suggest that the polar type increase is not only raised by the solar cosmic ray particles distributed isotropically in the interplanetary space but also by the anisotropic particles uniformly deflected from their initial emitted direction due to the solar magnetic cloud.View full abstractDownload PDF (619K) -
F. H. HIBBERD1961 Volume 12 Issue 4 Pages 222-226
Published: 1961
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSThe effect of secondary magnetization on the apparent position and polarity of a palaeomagnetic pole is examined and applied to measurements made by Momose on Pliocene rocks. It appears that in the Lower-Middle Pliocene the pole was near 70°N, 150°W, and that the polarity in the Lower Pliocene was normal and in the Middle Pliocene was reversed. A reversal of the earth's field appears to have occurred near the Lower-Middle Pliocene boundary.View full abstractDownload PDF (522K)
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