30 0 0 0 2009年皆既日食による眼障害の発生状況
6 0 0 0 OA 福島第一原発事故後の長野市の放射線量
- 著者
- 奥村 紀浩 大西 浩次 藤原 勝幸
- 雑誌
- 長野工業高等専門学校紀要 (ISSN:02861909)
- 巻号頁・発行日
- vol.45, pp.1-8, 2011
6 0 0 0 OA 太陽観察グラスの透過率測定Ⅱ
- 著者
- 齋藤 泉 大西 浩次 安藤 享平 大川 拓也 小野 智子 篠原 秀雄 高橋 淳 松尾 厚 奥野 勉
- 出版者
- 長野工業高等専門学校
- 雑誌
- 長野工業高等専門学校紀要 = Memoirs of Nagano National College of Technology (ISSN:02861909)
- 巻号頁・発行日
- vol.48, pp.1-11, 2014-06-30
We measured the transmittance of filters and the substitutes for direct observation of the sun, from 2009 to 2012. In this paper, we report the results of the measurements in detail. This paper gives fundamental data for observing solar eclipses safely.
6 0 0 0 OA 太陽観察グラスの透過率測定I
- 著者
- 大西 浩次 齋藤 泉 安藤 享平 大川 拓也 小野 智子 篠原 秀雄 高橋 淳 松尾 厚 奥野 勉
- 出版者
- 長野工業高等専門学校
- 雑誌
- 長野工業高等専門学校紀要 = Memoirs of Nagano National College of Technology (ISSN:02861909)
- 巻号頁・発行日
- vol.48, pp.1-10, 2014-06-30
May 21, 2012, solar eclipse was observed in Japan. This time, annular eclipse occurred over a wide range; i.e. the southern part of Kyushu, the southern part of Shikoku, the southern part of the Kinki, the southern part of the Chubu, such as the Kanto. Other regions became a partial solar eclipse. Approximately 83 million people are living in the path of annular phase, we were expected many people to observe the eclipse. Eclipse is a valuable opportunity to increase interest in science. On the other hand, when observing the sun, it runs a strong risk that leads to trouble in the eyes of people due to the strong sunlight. For example, in the case of the eclipse in Germany in 1912, solar eclipse retinopathy patients of 3,500 has occurred. We conducted our activities for many people to observe the eclipse safe. One of them is the spread of safe solar eclipse observation method, another is a research study of the safety of the solar eclipse glasses.In this paper, we report the transmittance measured in the various filters; solar viewing glass on the market, and their substitutes. These are valuable archival material related to solar observation glass for the solar eclipse in the future.
1 0 0 0 IR VERAによる星の質量測定の可能性
- 著者
- 大西 浩次
- 出版者
- 長野工業高等専門学校
- 雑誌
- 長野工業高等専門学校紀要 (ISSN:02861909)
- 巻号頁・発行日
- no.34, pp.77-86, 2000
Due to the development of High accuracy Astrometry, the positional shift of QSO due to gravitational deflection of light will be detectable. We showed that it is feasible to measure the mass of single star by observing the variation of gravitational deflection casused by the orbital motion of the Earth. For a stars within 100pc with an appropriate background source sach as a QSO within 1 arcsecond,their mass can be determined by measuring the deflection shift with the accuracy of 10 micro-arcsec. On the other hand, in the case that relative angular distance between star and QSOs is known by the other observation, the mass of star can be determined by measuring the shift of gravitational deflection of light We show the feasible to measure the mass of single star by VLBI Exploration of Radio Astrometry (VERA) and we show the general probability of the existence of candidate stars and the list of same candidate stars up to now. In the future, almost all stars within 1 arc-second from the QSOs become the candidate stars using a high accurate and a massive scaled data from a satellite such as GAIA. Therefore we propose that QSOs with nearby stars should be monitored for detection of gravitational lens effect for to detect the gravitational lens effect due to stars and MACHOs and the measurement of stellar mass.
1 0 0 0 OA 多胡事象(近傍星の重力マイクロレンズ現象)と銀河系構造
- 著者
- 大西 浩次
- 出版者
- 長野工業高等専門学校
- 雑誌
- 基盤研究(C)
- 巻号頁・発行日
- 2008
多胡事象とは、近傍の星で確認された初めての重力マイクロレンズ現象である。標準的な銀河系構造で、このような現象が起きる確率は非常に小さい。しかし、「質量分布関数の低質量側が、標準モデルより大きい」と考えると、この現象が説明出来る可能性がある。実際、MOAグループによる重力マイクロレンズの探査による、近傍の褐色矮星によるレンズ現象の発見や「浮遊惑星」の発見などから、低質量側の質量分布関数が、標準モデルの2倍程度になる事が判った。これらより、多胡天体の正体は褐色矮星や浮遊惑星であると考えられる。これらは、近い将来、固有運動の測定によって明らかにされるであろう。
1 0 0 0 IR 太陽観察グラスの透過率測定I
- 著者
- 大西 浩次 齋藤 泉 安藤 享平 大川 拓也 小野 智子 篠原 秀雄 高橋 淳 松尾 厚 奥野 勉
- 出版者
- 長野工業高等専門学校
- 雑誌
- 長野工業高等専門学校紀要 = Memoirs of Nagano National College of Technology (ISSN:02861909)
- 巻号頁・発行日
- vol.48, pp.1-10, 2014-06-30
May 21, 2012, solar eclipse was observed in Japan. This time, annular eclipse occurred over a wide range; i.e. the southern part of Kyushu, the southern part of Shikoku, the southern part of the Kinki, the southern part of the Chubu, such as the Kanto. Other regions became a partial solar eclipse. Approximately 83 million people are living in the path of annular phase, we were expected many people to observe the eclipse. Eclipse is a valuable opportunity to increase interest in science. On the other hand, when observing the sun, it runs a strong risk that leads to trouble in the eyes of people due to the strong sunlight. For example, in the case of the eclipse in Germany in 1912, solar eclipse retinopathy patients of 3,500 has occurred. We conducted our activities for many people to observe the eclipse safe. One of them is the spread of safe solar eclipse observation method, another is a research study of the safety of the solar eclipse glasses.In this paper, we report the transmittance measured in the various filters; solar viewing glass on the market, and their substitutes. These are valuable archival material related to solar observation glass for the solar eclipse in the future.
1 0 0 0 IR 太陽観察グラスの透過率測定Ⅱ
- 著者
- 齋藤 泉 大西 浩次 安藤 享平 大川 拓也 小野 智子 篠原 秀雄 高橋 淳 松尾 厚 奥野 勉
- 出版者
- 長野工業高等専門学校
- 雑誌
- 長野工業高等専門学校紀要 = Memoirs of Nagano National College of Technology (ISSN:02861909)
- 巻号頁・発行日
- vol.48, pp.1-11, 2014-06-30
We measured the transmittance of filters and the substitutes for direct observation of the sun, from 2009 to 2012. In this paper, we report the results of the measurements in detail. This paper gives fundamental data for observing solar eclipses safely.
1 0 0 0 OA しし座流星群の暗い流星分布計測
- 著者
- 大西 浩次 柳沢 俊史 鳥居 研一 小浜 光洋
- 出版者
- 長野工業高等専門学校
- 雑誌
- 長野工業高等専門学校紀要 (ISSN:02861909)
- 巻号頁・発行日
- vol.38, pp.87-94, 2004-06-30
McNaught and Asher (2001) predicted the Leonids Meteor Storm in 2001 due to the 4-rev (1866 yr.) and 9-rev (1699 yr) dust trails of the Leonids. To measure the flux and magnitude distribution of very faint meteors, we performed deep imaging telescopic observations with the cooled CCD camera toward the radiant points of the Leonids. We observed the Leonids meteor storm Nov.18 UT 2001, and succeeded to separate the radiant points due to the 4-rev and 9-rev dust trails (Yanagisawa et al. 2003, Torii et al. 2003) and we also succeeded to detect the faint meteors under 10 magnitudes (Kohama et al. 2003). The flux of faint meteors increases with the population index of 2.4, and the flux was obtained as (4.2±2.1)×10^<-4>km^<-2>s^<-1>(mag≦+12). We have found no apparent cutoff of the flux at brighter than~12 magnitude. The size of meteoroid of 10th magnitude meteor is a several tenth μm. Such small meteoroids are not the meteoroids of 4-rev (1866 yr.) and 9-rev (1699 yr) dust trails, because it is considered that they cannot return around the orbit of dust trail due to the solar radiation pressure. Thus we have to consider the new physical mechanism to create such small meteoroids. To established the property of faint meteor distribution, we also performed the deep imaging telescopic observation at the duration of the Leonids 2002 and 2003. This paper describes the detailed observation circumstances of Leonids 2001, 2002, and 2003 and the preliminary result of faint meteor distribution of Leonids.