巻号一覧
39 巻, 2 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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Takayuki ONO, Masaki EJIRI, Takeo HIRASAWA1987 年 39 巻 2 号 p. 65-95
発行日: 1987年
公開日: 2010/09/14
ジャーナル フリーA new TV camera system was developed for monochromatic digital imaging of auroras. On the basis of observation in 1984 at Syowa Station, Antarctica by the TV system, three types of auroral activities were analysed, i. e., i) stable auroras in the dusk sector, ii) active auroras and iii) pulsating auroras in the dawn sector. The results are; 1) diffuse auroral belt which appears at the lower latitude border of auroral activity coincides with the distribution of Hβ emission, 2) enhancement of auroral 5577Å emission is much larger than that of 6300Å emission at the westward travelling surge and 3) period of auroral pulsation in the dawn sector shows regional variations. The observation suggests; 1) that the diffuse aurora in the dusk sector at the lower latitude side is excited by auroral protons, 2) that a hardening of energy spectrum of precipitating electron is associated with the westward travelling surge.抄録全体を表示PDF形式でダウンロード (9516K) -
Lanny R. WILSON1987 年 39 巻 2 号 p. 97-109
発行日: 1987年
公開日: 2010/09/14
ジャーナル フリーThe method used for estimating the daily regular variation of the magnetic field and the computation of digital K values are discussed. Test magnetograms, synthesized from digital one-minute values for a wide range of magnetic conditions, are shown with regular variation curves superimposed on their respective component traces. Comparisons of K-indices computed from digital one minute values with K-indices handscaled from magnetograms were made using data from five U. S. Geological Survey magnetic observatories. The test magnetograms and normal magnetograms were examined to identify possible sources of difference in the two methods. The results indicate that the number of differences attributed to bias in the digital method may not be significantly different than the number of subjective differences by the handscaling method.抄録全体を表示PDF形式でダウンロード (1114K) -
Leroy R. ALLDREDGE1987 年 39 巻 2 号 p. 111-118
発行日: 1987年
公開日: 2010/09/14
ジャーナル フリーPDF形式でダウンロード (661K)
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