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Volume 35, Issue 5
Displaying 1-3 of 3 articles from this issue
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Marsha R. TORR1983 Volume 35 Issue 5 Pages 131-153
Published: 1983
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSIn this report we review significant developments in the areas of neutral and ion chemistry in the thermosphere and in solar flux measurements since the 1979 IAGA meeting. Considerable progress has been made and this report is by no means complete. Several very long standing problems have been solved, and some major issues have been opened in areas which were considered fairly well resolved.View full abstractDownload PDF (1980K) -
Yozo HAMANO1983 Volume 35 Issue 5 Pages 155-172
Published: 1983
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSTen rock samples were progressively demagnetized by uniaxial compressions up to 300 bars, and the results were compared with the alternating field demagnetization of the same rocks. Relative change of the NRM intensity during the stress demagnetization ranges from 0.4% to 47.7% at 100 bars. The stress sensitivity correlates with the stability to AF demagnetization, and the directional changes during the two types of demagnetization were similar to each other. These observations indicate that the stress level which affect a remanence relates with the magnetic coercivity of the remanence. For a quantitative comparison, equivalent magnetic fields of the uni-axial stress were calculated as a ratio of the stress sensitivity to the magnetic stability. The equivalent field ranges from 2.3oe/100 bars to 37.5oe/100 bars, and the porous rocks tended to have larger equivalent fields. The porosity effect can be attributed to the stress intensification on the magnetic minerals embedded in rocks. Based on the present observations, it is concluded that the magnetic stability and the porosity of rocks have dominant effect on the stress sensitivity of remanent magnetization.View full abstractDownload PDF (1721K) -
Yozo HAMANO1983 Volume 35 Issue 5 Pages 173-183
Published: 1983
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSThe effect of the magnetic interaction between the magnetic carriers was estimated by a simple pair model, where the remanences of post depositional origin was assumed. The theory predicts a large concentration dependence of the intensity of the remanence for a very low concentration range (packing fraction ≤ 0.1%) if the magnetic particles are small and have a single domain structure. The effect decreases with the increase of the grain size. In order to check the validity of the theory, the intensity of the remanence acquired during the consolidation of artificial sediments was measured as a function of the concentration of fine grain magnetites in a magnetite-talc mixture. The result indicates the large concentration dependence of the remanence intensity. The validity of the various methods, which have been used to normalize the NRM in sediments to obtain the relative intensity change of the earth's magnetic field, was discussed on the basis of the present result.View full abstractDownload PDF (1286K)
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