巻号一覧
36 巻, 5 号
選択された号の論文の5件中1～5を表示しています
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R. ITO, T. TSUDA, T. ASO, S. KATO1984 年 36 巻 5 号 p. 173-188
発行日: 1984年
公開日: 2010/09/14
ジャーナル フリーWe have performed a harmonic analysis on the Kyoto meteor radar (35°N, 136°E) data taken in 1978-1983, and examined long period oscillations at heights of 80-110km. In summer, an intense oscillation with almost constant phase with height has been detected at a period of around two days, although its amplitude varied in time comparable to a few periods of the wave. Other components with periods of several days have also been detected. We have found that the phases of these long period waves progress upward and their vertical wavelengths are fairly long. Their amplitude maxima took place in between midsummer and autumn, and the longer the period is, the later the maximum occurs.抄録全体を表示PDF形式でダウンロード (1366K) -
R. P. KANE1984 年 36 巻 5 号 p. 189-196
発行日: 1984年
公開日: 2010/09/14
ジャーナル フリーThe daily variation characteristics of ionospheric f0F2 at two locations on the magnetic equator in the American region viz. Huancayo (12°S, 75°W, Dip angle 2°N) and Natal (5°S, 35°W, Dip angle 1°-2°S in 1958-62) show considerable differences. Possible causes could be differences in electrodynamic effects and/or particle precipitation from magnetospheric regions at Natal, which is near the South Atlantic Geomagnetic Anomaly.抄録全体を表示PDF形式でダウンロード (545K) -
R. P. KANE1984 年 36 巻 5 号 p. 197-201
発行日: 1984年
公開日: 2010/09/14
ジャーナル フリーA comparison of the daily variation patterns of the geomagnetic field components H, Z, D and the ionospheric f0F2, at the equatorial locations Huancayo (12°S, 75°W, dip+1.9°) on the west coast and Eusebio, Fortaleza (4°S, 39°W, dip-3.5°) on the east coast of the South-American continent, shows that the equatorial electrojet and the associated “fountain effect” are weaker on the east coast.抄録全体を表示PDF形式でダウンロード (562K) -
Sadao SASAJIMA, Susumu NISHIMURA, Kimio HIROOKA1984 年 36 巻 5 号 p. 203-214
発行日: 1984年
公開日: 2010/09/14
ジャーナル フリーA reversed short polarity episode in the late Brunhes Epoch has been discovered in two dacitic welded tuffs located in Kagoshima, South Kyushu, Japan, and Siguragura, North Sumatra, Indonesia. Combined with the stratigraphic relations and both fission-track ages ranging 0.10-0.13m.y., each polarity episode is correlated with the Blake polarity event. If this is correct, then it is the first time that the Blake reversed event has been identified in igneous terrestrial rocks. Based on our results, along with the recently published, worldwide Blake episodes, it is strongly suggested that the hypothesis of a global geomagnetic reversal for the Blake event is more tenable than that of a local reversal model by DENHAM (1976).抄録全体を表示PDF形式でダウンロード (1164K) -
Masahiko TAKEDA1984 年 36 巻 5 号 p. 215-228
発行日: 1984年
公開日: 2010/09/14
ジャーナル フリーThe instantaneous equivalent current system of Sq is obtained at every 2 hours from March 11 to 26, 1970 under the assumption of north-south symmetry. Trends in H- and Z-components due to UT dependent disturbance fields are corrected by using the Dst index. It is found that UT variation in the intensity and location of external current vortex is similar to that of September, 1964, though the intensity itself is about twice. Day-to-day variation of Sq is examined by subtracting the UT mean values. The residual patterns are quite different day by day, but on some days they resemble currents generated by semi-diurnal tidal winds, and on other days they seem to be caused by the field-aligned currents in high latutudes. The latter are shown to be correlated with the AE index.抄録全体を表示PDF形式でダウンロード (1400K)
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