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Volume 32 (1980)
- Issue 12 Pages 721-
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Volume 17 (1965)
- Issue 3-4 Pages 163-
- Issue 2 Pages 99-
- Issue 1 Pages 1-
Volume 17, Issue 2
Displaying 1-7 of 7 articles from this issue
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Shizuko SAKAKIBARA1965 Volume 17 Issue 2 Pages 99-112
Published: September 20, 1965
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSMany data on sidereal time variation of cosmic rays have been reported in the energy region mainly 1013 to 1018eV from air shower experiment at various places. These data show that both the amplitude and the time of maximum of sidereal daily variation change systematically with primary energy of air showers, that is, the time of maximum is at about 20 hour for energy less than 5×1015eV and turns to 12 hour in sidereal time for the higher energies. At the same time, amplitude shows a constant value of about 0.5% for the lower energy and it increases with the energy at the higher energy region. These tendencies that the sidereal variations change with the primary energy are statistically significant. Though Greisen suggested that data reported by many observers did not represent real anisotropy in consequence of statistical cause and atmospheric effect, it is thought that the energy dependent sidereal variation shows the existence of the anisotropy and this is interpreted as follows.
On the assumption that a magnetic field of the order of the 10-5 gauss lies along a spiral arm of the Galaxy pointing to the outward-directed spiral arm and our solar system locates near the boundary of the arm, the above anisotropy can be explained by considering diffusion of cosmic rays in the arm. That is, the time of maximum in the lower energy region, 20 hour, corresponds to one of the direction of flow along the field lines, while the time of maxmum in the higher energy region, 12 hour, and also the energy dependence of the amplitude are expected as the results of the diffusion of cosmic rays due to the density gradient from the axis to the boundary of the arm.View full abstractDownload PDF (1414K) -
Haruaki ITO1965 Volume 17 Issue 2 Pages 113-120
Published: September 20, 1965
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSThe author collected intrusive rocks in Nose district in Kinki Province and measured their natural remanent magnetization. Results of measurements of rocks collected from one rock body are as follows: the natural remanent magnetization of the intrusive rocks collected at the contact zone with country rocks was normal, while that of the intrusive rocks collected at places a little far from the contact zone was reverse. The directions of remanent magnetization were neither typical normal nor reverse. The normal direction deviated easterly relative to the present field direction, and the reverse one westerly.
A fact that the rocks from a single mass possess both the normal and reverse magnetization can be explained, considering that the rock mass had been formed at the times when a transition of the geomagnetic field occurred, and the intermediate direction of magnetization seems to indicate the transition of the dipole of the geomagnetic field. The pole positions obtained from the intermediate direction of natural remanent magnetization lie in the same zone as those obtained from the Mio-Pliocene rocks in southwestern Japan.View full abstractDownload PDF (831K) -
Magnetization of Titaniferous Magnetite under Uniaxial CompressionTakesi NAGATA, Hajimu KINOSHITA1965 Volume 17 Issue 2 Pages 121-135
Published: September 20, 1965
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSChanges in the magnetization curves, magnetic susceptibility, and remanent magnetization of magnetite and titaniferous magnetite under uniaxial compression are experimentally examined in a systematic way. The uniaxial compression results in a reduction of the intensity of magnetization and the magnetic susceptibility of both single crystals and assemblages of fine grains of titaniferous magnetite.
However, a removal of the compression from the samples in presence of a magnetic field results in an abrupt increase of magnetization, the resultant intensity of magnetization being larger than the ordinary magnetization without the effect of compression in the same field. The majority of the increased magnetization remains as the remanent magnetization after removal of the field. Thus, the isothermal remanent magnetization produced by removing uniaxial compression in a magnetic field increases with increasing magnitude of the uniaxial compression.View full abstractDownload PDF (1363K) -
1. A Hydromagnetic Constraint: TheoryP. H. ROBERTS, S. SCOTT1965 Volume 17 Issue 2 Pages 137-151
Published: September 20, 1965
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSIt is noted that the time-scale of the secular variation of the geomagnetic field is rather short compared with the electromagnetic diffusion times appropriate to the earth's core. It is therefore suggested that the secular variation is primarily due to the rearrangement of pre-existing lines of force emanating from the core, and not due to the creation of new (or destruction of old) flux tubes by electromagnetic diffusion. The theoretical consequences of this idea are fully examined.View full abstractDownload PDF (1694K) -
Takesi NAGATA1965 Volume 17 Issue 2 Pages 153-155
Published: September 20, 1965
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSDownload PDF (309K) -
Takesi NAGATA1965 Volume 17 Issue 2 Pages 157-159
Published: September 20, 1965
Released on J-STAGE: September 14, 2010
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S. A. A. KAZMI1965 Volume 17 Issue 2 Pages 161-162
Published: September 20, 1965
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSDownload PDF (182K)
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