文章基本信息

标题：VISUAL AURORA OBSERVATION AT SYOWA BASE, 1957-58
其他标题：昭和基地におけるオーロラ観測(1957-58)
本地全文：下载
作者：Taiichi KITAMURA
期刊名称：Antarctic Record
印刷版ISSN：0085-7289
电子版ISSN：2432-079X
出版年度：1958
卷号：5
DOI：10.15094/00006876
语种：English
出版社：National Institute of Polar Research
摘要：Visual observations of aurorae were carried out with IGY scheme at Syowa Base from March to October 1957. Unfortunately observed data except those in August and September, 1957, were burnt out by accident. Results described here, therefore, concern only data obtained in these two months. 1. Position of auroral maximum zone Fig 5 shows frequency distribution of auroral position (lower boundary of aurorae being projected on the earth's surface) in the neighbourhood of Syowa Base. It may be concluded from this result Syowa Base is situated nearly under the northern boundary of the maximum zone of aurora australis. 2. Daily variation Fig. 8 illustrates daily variation of auroral frequency at Syowa Base. As shown in the figure, maximum of frequency takes place at about 23 h LT and second maximum occurs at dawn. It may be worthwhile to note that no aurora was observed during 8 hours from 10 h to 18 h LT throughout the whole period of Antarctic winter. 3. Variation in azimuth of the highest point of auroral arcs Azimuth of the highest point of the auroral arcs, observed from Syowa Base differs at different local times, as shown in Fig. 9, where the azimuth angle is counted from the gecmagnetic north. The azimuth of the highest point of the arcs indicates approximately the direction perpendicular to the auroral arcs. The azimuth became most geomagnetically southwards at 22 h and 01 h LT. Even at these times, the direction of auroral arcs is deviated counterclockwise from the geomagnetic latitude circle by 17 ° -30 ° . 4. Radiation point of auroral corona Examples of azimuth and altitude of radiation point (center) of auroral corona observed at Syowa Base are as shown in Table 1. Average values of these observed data are 62 ° . 7 < h < 66 ° . 9 for altitude, -9° .l