巻号一覧
30 巻 (1984)
- 4 号 p. 249-
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30 巻, 1 号
選択された号の論文の8件中1～8を表示しています
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萩原 幸男1984 年 30 巻 1 号 p. 1-16
発行日: 1984/05/25
公開日: 2010/09/07
ジャーナル フリーFitlering techniques separate a gravity map into short- and long-wavelength ones. It can be concluded on the basis of gravity and topography data that terrain masses of wavelength shorter than 160 km are sustained by an elastic strength of the crust but those of longer wavelength are balanced in an isostatic equilibrium with the crustal thickness. In this paper, we use a two-dimensional Box-car window as a low-pass filter with its application to gravity zoning of the Japan island-arcs. We see a clearcut zone arrangement of positive and negative gravity anomalies along the island-arcs.抄録全体を表示PDF形式でダウンロード (5852K) -
堀 源一郎1984 年 30 巻 1 号 p. 17-28
発行日: 1984/05/25
公開日: 2010/09/07
ジャーナル フリー人工衛星から長いひもで繋いだ探測器を放出して,周囲の空間の探測を行なうさいに,衛星に対する探測器の相対運動を予測することが必要である.ひもが弛んでいれば相対ケプラーに,ひもが張っていれば振子運動となる.一般にはこの2種類の運動が相互に繰返えされるが,初期条件によっては振子運動に帰する.ひもの張力は,公転周期2時間の衛星から100kgの探測器を10kmのひもで繋いで放出する場合,約700g重である.抄録全体を表示PDF形式でダウンロード (739K) -
佐々木 稔1984 年 30 巻 1 号 p. 29-40
発行日: 1984/05/25
公開日: 2011/07/05
ジャーナル フリー口径60cmの受光望遠鏡,出力150mJ,パルス幅200ps,発射繰返し4ppsのレーザーを持つ人工衛星レーザー測距装置を下里水路観測所に設置して,1982年3月以来ラジオス,スターレット,ビーコンCの3衛星の測距観測を実施している.1984年1月末までの測距回数は,ラジオス201パス,42,828回,スターレット161パス,35,757回,ビーコンC287パス,111,364回となり,1回の測距当りの平均精度は,10cm程度である.現在,測距回数と測距精度の向上を目的として各種の測定と改良作業を行っている.当観測所と各国の測距局において得られた測距データを用いて地心座標系に基づく下里水路観測所の位置を,開発した軌道解析プログラムにより算出した.テキサス大学において地球回転パラメーターの推定に,基準座標系として用いられているLPM81.12座標系に準処して,レーザー測距装置の高度および方位軸の交点の位置について予備的に求めた値は,北緯33゜34′39″.683,東経135゜56′13″;.156,基準楕円体(長半径6378137.0m,扁平率1/298.257)高100.90mである.日本測地系による地上測量の結果との比較から,日本測地系からLPM81.12座標系への測地座標系変換量は,ΔU=-142.8m,ΔV=+510.7m,ΔW=+681.0Mと求まる.LPM81.12座標系について,マクドナルド天文台の2.7mの月レーザー測距用の望遠鏡の基準点を介して,月レーザー測距の結果から求まっている経度差+0″.197を加えると,上記測地座標系変換量は,ΔU=-146.3m,ΔV=+507.1m,ΔW=+681.0mとなり,日本測地系は,BIH座標系にかなり近い地心天文座標系に結合されることになる.抄録全体を表示PDF形式でダウンロード (1580K) -
藤下 光身1984 年 30 巻 1 号 p. 41-49
発行日: 1984/05/25
公開日: 2010/09/07
ジャーナル フリーTime variations of relative positions of celestial radio sources are investigated to estimate errors on group delay observations for geodesy and geophysics with a very long baseline interferometer. Differences of relative positions of 0355+508, 1226+023 and 1641+399 are studied among catalogues of G. H. Purcell Jr. et al. (1980), J. L. Franselow et al. (1981) and S. Ye (1982). It seems that systematic errors exist between the second and the third catalogues. There is no time variation exceeding 30 milli-arc-second between mean observation epoch 1975 and 1981.抄録全体を表示PDF形式でダウンロード (602K) -
坂田 正治, 島田 誠一1984 年 30 巻 1 号 p. 50-58
発行日: 1984/05/25
公開日: 2010/09/07
ジャーナル フリーWe have been developing an ocean bottom tiltmeter applicable to continuous tilt observation in the ocean area. In the former paper [1], the purpose of the development, the concept of the design, the structure and the character of tiltsensors were described. In this paper we deal with the latter part of development. After we successfully carried out the long term stability test of tiltsensors combined with the attitude control apparatus, the underwater part was finally assembled and the final long term stability test was done in the vault of Tateyama Observatory (GSI) to reveal no problem. Then the tiltmeter was installed on the free surface of the sea bottom of 20m depth off Hiratsuka in Sagami Bay. Observation showed that the drift rate is very high especially at the time of stormy weather. Since the original purpose of the experiment was to determine whether or not it is possible to carry out tilt observation in and on a sand layer, we decided to bury the tiltmeter in the sand layer in order to avoid wave effects. In October 1982 the tiltmeter was removed 10m to the south from the previous location and was buried at 2-3m depth. To get better coupling with the sand layer of high N-value, a four-foot steel platform was adopted under the tiltmeter. After burial, the drift rate decreased rapidly to a present mean value of about 5μrad/month. Thus, we conclude that it is possible to detect short term tilt change of the order of 1μrad by an ocean bottom tiltmeter in a sand layer.抄録全体を表示PDF形式でダウンロード (1512K) -
大気:境界層における気温逓減率の日周変化について木股 文昭1984 年 30 巻 1 号 p. 59-60
発行日: 1984/05/25
公開日: 2010/09/07
ジャーナル フリーMeteorological corrections for electro-optical distance measurements can be made out accurately when temperature lapse rate in planetary boundary layer near the ground surface becomes very small. This letter discusses the diurnal variations of temperature lapse rate by making use of data from Meteorological Research Institute. The lapse rate is analyzed from the monthly mean of atmospheric temperatures at altitudes from 10 m to 200 m above the ground. The duration when the rate is within ±0.25°C/100 m amounts to seven hours around sunset in summer but only one hour in winter. The rate changes very quickly in the morning. The maximum rate appears just at the time of sunrise and becomes very small a few hours after sunrise.抄録全体を表示PDF形式でダウンロード (358K) -
Joenil KAHAR1984 年 30 巻 1 号 p. 61-68
発行日: 1984/05/25
公開日: 2010/09/07
ジャーナル フリーPrimary triangulation network of Jawa was started in 1862 and completed in 1880. This network was computed in a system which was called Genuk System. This network was extended to Sumatera and Nusa Tenggara Isles and the computation in the Genuk System for those area was started in 1931. Beside this system there were two other systems, Malayan System for Bangka, Riau & Lingga and Serindung System for West Kalimantan. A unified datum was established after a Doppler satellite observation held in Padang, and the datum was called the Indonesian Datum 1974 (ID-1974). Determination of geoid in the Indonesian Archipelago was worked out by combining a global detailed gravimetric geoid computed by March & Chang (1976) and the oceanic geoid derived from GEOS-3 altimetry data (Rapp, 1979). A new precise leveling network in Jawa has been designed and measured since 1980. The measurements of this network will be completed in 1985, so that the measurements may be continued to Sumatera. Principal gravity base stations were established through a joint working between the Geological Survey of Indonesia and the University of New England, Australia.抄録全体を表示PDF形式でダウンロード (691K) -
藤井 陽一郎1984 年 30 巻 1 号 p. 69-70
発行日: 1984/05/25
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (287K)
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