著者
石田 喜雄 小玉 正弘 Yoshio ISHIDA Masahiro KODAMA
雑誌
南極資料 (ISSN:00857289)
巻号頁・発行日
vol.35, pp.1-21, 1969-07

At Syowa Station, Antarctica, the cosmic-ray neutron observation was made, at the initial stage, with the IGY-type neutron monitor during the period from March 1960 to December 1961. On the opportunity of IQSY, a new type of cosmic-ray meter, IQSY-type neutron monitor, was developed by CARMICHAEL. In February 1967, the IQSY-type neutron monitor consisting of three counters (3-NM-64) was installed at Syowa Station in the 8th Japanese Antarctic Research Expedition. In February 1968 seven counters were added and two more in February 1969, finally twelve counters. The recording system for observation comprises the so-called multiplicity meter, by which the counting rates are divided into six channels, multiplicity=1 to more than 6, according to the neutron multiplicity detected within the gating time of 1 m sec. The counting rates are automatically printed and punched on a tape every ten minutes. This readout equipment became duplex since February 1968. The cosmic-ray observation room was specially designed so as to avoid influence of snowdrift around the building in which the neutron monitor is installed, and also to keep the room temperature constant throughout the year. In practice, no snow effect on the neutron intensity was recognized and the room temperature was 20°±1℃ in 1967. This report describes details of the cosmic-ray neutron observation in 1967-1968 and some results deduced from data analyses The atmospheric effect, the diurnal variation and the Forbush decrease were investigated in connection with the neutron multiplicity, particularly with regard to the remarkable Forbush event in May 1967.
著者
福島 紳 小玉 正弘 宮崎 友喜雄 Shin FUKUSHIMA Masahiro KODAMA Yukio MIYAZAKI
雑誌
南極資料 (ISSN:00857289)
巻号頁・発行日
vol.11, pp.894-898, 1961-01

当初,南極観測用に製作された宇宙線中性子観測装置は,IGY用として設計されたもので,全体の重量が6トンを超えるため,ヘリコプター輸送に適さない.そこで重量軽減化の方法として,(1)ニュートロン減速剤として,パラフィンの代りに現地の海水を利用する.(2)真空管方式の増幅,計数装流をすべてトランジスター化する.の2点から,新しい観測装置を製作した.この装置は重量約500kgで,第4次観測隊により無事基地へ空輪された.観測は1960年3月3日より開始された.観測結果の一部として,日平均値の変化及び5月4日の宇宙線異常増加の結果を示した.
著者
福島 紳 小玉 正弘 牧野 忠男 宮崎 友喜雄 Shin FUKUSHIMA Masahiro KODAMA Tadao MAKINO Yukio MIYAZAKI
雑誌
南極資料 (ISSN:00857289)
巻号頁・発行日
vol.20, pp.1707-1732, 1964-02

第1次から第6次までの,南極観測船「宗谷」船上で行なった宇宙線強度の観測データの最終結果を集録した.地磁気緯度並びにdipole modelのcut off rigidityも同時に与えてある.