検索結果 12件中 1-12 を表示

  • Ampère force exerted by geomagnetic Sq currents and thermospheric pressure difference

    Takeda Masahiko

    … The Ampère force exerted by meridional Sq currents was estimated, and its relationship with a neutral pressure difference was examined. … Furthermore, these two values were almost the same around the Sq current vortex during the equinox. …

    Journal of Geophysical Research: Space Physics 120(5), 3847-3853, 2015-05-06

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  • 観測ロケット搭載用電場・中波帯電波観測装置の開発

    石坂 圭吾 , 芦原 佑樹 , 三宅 壮聡 [他] , 岡田 敏実

    電離圏中の高度105〜110kmの領域で冬季の午前11時前後という限られた条件において,電離圏の電子温度が背景に対して局所的に上昇するという特異な現象を解明するため,2007年1月,宇宙航空研究開発機構・内之浦宇宙空間観測所において観則ロケット実験が実施される.本研究では電離圏中の電場の直接計測および中波帯電波を用いた電子密度分布推定を行うためのロケット搭載用観測装置を設計・開発した.

    富山県立大学紀要 17, 70-77, 2007-03-30

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  • Polar Cap Field Response to IMF By Sector Changes on Quiet Days at a Longitude Line of Observatories.

    Campbell Wallace H. , Arora Baldev R. , Schiffmacher Edward R.

    … The equivalent external current representation of the polar fields (sometimes called <I>Sq</I><SUP>P</SUP>) show two vortices separated by the day-night hemisphere boundary. … When plotted in local time, the nighttime current patterns are usually observed to change positions to earlier locations when the IMF sector structure varied from the Toward (IMF <I>B<SUB>y</SUB></I> …

    Journal of geomagnetism and geoelectricity 46(9), 735-746, 1994

    J-STAGE

  • Sq 電流系と熱的電子の振舞いとの関係 : K-9M-81/S-310-18 号機による測定結果

    小山 孝一郎 [他] , 雨宮 宏 , Piel A. , Thiemann H.

    … 両者の違いはSq電流系の目玉からの距離によるものと考えられる。 …

    宇宙科学研究所報告. 特集 26, 3-23, 1990-03

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  • Mantle conductivity from the geomagnetic Sq field.

    TAKEDA Masahiko

    … The amplitude ratio and phase difference of the spherical harmonics of the magnetic potential between the internal and external parts of the geomagnetic <i>Sq</i> … mode is small when the external current vortex is above the Pacific Ocean. …

    Journal of geomagnetism and geoelectricity 41(7), 643-646, 1989

    J-STAGE

  • Day-to-day variation of equivalent Sq current system during March 11-26, 1970.

    TAKEDA Masahiko

    … 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. … 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. …

    Journal of geomagnetism and geoelectricity 36(5), 215-228, 1984

    J-STAGE

  • On an origin of ultra long period (several days) of geomagnetic fluctuations.

    KITAMURA Tai-ichi

    … Two current systems were newly found. … One is MDP 1 (Modified DP 1) which is characterized by three current vortices in the polar and middle latitides with westward zonal currents in the lower and equatorial regions. … The other is MDP 2 (Modified DP 2) which has two vortices (one vortex in MDP 1 seems to be dissipated) in the polar region, with westward zonal currents in the lower and equatorial regions.<br>A day-to-day change of the <i>Sq</i> …

    Journal of geomagnetism and geoelectricity 31(3), 211-223, 1979

    J-STAGE

  • Anomalous heating of the thermal electrons near the focus of the Sq current vortex (Sq focus anomaly).

    OYAMA Koh-ichiro , HIRAO Kunio

    … The maximum electron temperature in the layer was controlled by the sunspot number, the intensity of the dynamo current and the location of the focus of the geomagnetic <i>Sq</i> … current vortex. …

    Journal of geomagnetism and geoelectricity 31(1), 11-19, 1979

    J-STAGE

  • <論文>K-9M-55号機による電離層電流系の観測(II) : Field Aligned Current

    小川 徹 , 藪崎 努

    … The ionospheric current over Kagoshima at 11:00 LT was observed by means of an optically pumped Cs magnetometer. … We find a horizontally diversing current whose origin is presumed to be the filed aligned current from the antihemisphere. … The diversing current is distributed from 110 Km to 120 Km and total field aligned current is estimated to be 1.7 × 10^5 A which is nearly coincident with the theoretical value. …

    東京大学宇宙航空研究所報告 14(4_B), 1237-1243, 1978-12

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  • K-9M-55号機による電離層電流系の観測

    小川 徹 , 藪崎 努

    … The Sq ionospheric currents over Kagoshima at near noon was measured by means of an optically pumped Cs magnetometer. … (The north-south component were not measured.) (2) The east component of the current density was 29.7 A/Km. … From the result (1), we see that the measurement was performed in the north side of the center of the global Sq current vortex. …

    東京大学宇宙航空研究所報告 13(3_C), 961-968, 1977-10

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  • 水路部磁i気点でのプロトン磁力計連続観測結果について

    大島 章一 [他] , 森 俊雄

    … Those are considered to be caused by changes of equivalent Sq current vortex and anomalous variation due to local conductivity anomaly of the under-ground structure. …

    測地学会誌 20(1-2), 70-76, 1974

    J-STAGE

  • 不均質薄層の電磁感応〔英文〕

    力武 常次

    … Application of the programme to a plane sheet which simulates a gradual increase in the sea-depth from the coast-line leads to a conclusion that a high concentration of the induced current takes place over the deep sea area resulting in an anomalous magnetic variation field there. … The most remarkable current vortex takes place over the South Pacific. … It seems likely that the Sq, s.s.c. …

    東京大学地震研究所彙報 45(4), 1229-1294, 1968-02

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