巻号一覧
36 巻, 6 号
選択された号の論文の3件中1～3を表示しています
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S. B. ANISIMOV, N. N. RUSAKOV, V. A. TROITSKAYA1984 年 36 巻 6 号 p. 229-238
発行日: 1984年
公開日: 2010/09/14
ジャーナル フリーData on the measurements of the variations of the electric current in the air on mid-latitudes in the range 2.5-0.1Hz and 0.1-0.01Hz are given. It is shown that there are essential differences in the character of the variations of the vertical electric current and of the magnetic field in the range 0.1-0.01Hz, namely of their distribution in local time and dependence on Kp-index. The previously unknown signals with V-form spectrum were registered in the vertical electric current and in the magnetic field in the range 2.5-0.1Hz. The model of the oscillation of the space charge in the near Earth's layer under the action of infrasound is suggested to explain some of the observed variations.抄録全体を表示PDF形式でダウンロード (4836K) -
Y. NAITO, Y. TOMODA, A. UCHIYAMA, Y. OHKURA, Y. NAGAYAMA, Y. TAKAHASHI1984 年 36 巻 6 号 p. 239-256
発行日: 1984年
公開日: 2010/09/14
ジャーナル フリーA new type of ocean bottom magnetometer (OBM) for investigations of conductivity anomaly (CA) was built according to the philosophy of design that it should be small in size, light in weight, easy to operate, strong enough against mechanical shocks, capable of long-term observations with an accuracy better than 1nT. The device of the pop-up type OBM has several characteristics as follows; small fluxgate sensors are used for magnetic detection, outputs of sensors are converted to digital data and stored in magnetic bubble memories, electric power is supplied intermittently for economy's sake; the measurement system is installed in a pressure-tight glass sphere with an outer diameter of about 43cm, and its recovery from the ocean bottom is made by sending an ultrasonic command from a ship to the releasing system of the OBM.
After a successful test on land, trial observations were carried out in the Sagami Trough at the water depth of about 1, 500m. Records were obtained for the whole period of observation from November 13 to December 16, 1982, and analyzed to give transfer functions and Parkinson vectors. The results seem to be consistent with the central Japan anomaly for geomagnetic variation with a period longer than ten odd minutes. For the period of ten minutes, other type of conductivity anomaly seems to exist.抄録全体を表示PDF形式でダウンロード (1343K) -
Wallace H. CAMPBELL1984 年 36 巻 6 号 p. 257-265
発行日: 1984年
公開日: 2010/09/14
ジャーナル フリーThe annual and semiannual behavior of the local midnight field for North America, is represented as an external current system display derived from a spherical harmonic analysis. There are two vortices of this current: one is clockwise, centered in the Southern Hemisphere in the June solstitial period; the other is counter-clockwise, centered in the Northern Hemisphere in the December solstitial period. The foci of approximately 19, 000 amperes are located near 8 degrees geomagnetic latitude. The seasonal change in orientation of the solar wind with respect to the Earth's geomagnetic dipole axis explains most of the current pattern appearance. The maximum amplitude of the field components reconstructed from the representation rises to about 5 to 6 gammas at the equatorial and polar latitudes and to about half that size at the middle latitudes.抄録全体を表示PDF形式でダウンロード (868K)
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