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1984년 ~ 2025년까지 1,249 건의 한국우주과학회지를 계간으로 확인하실 수 있습니다.
- The Korean Space Science Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-052x (ISSN : 1225-052x)
1225-052x
- DB구축현황 : 1,249건 (DB Construction : 1,249 Articles)
총 게시글 1,249건
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911
- Kim, Hyo-Min
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.317-328
- 2000
- 원문 바로보기
The solar wind contributes to the formation of unique space environment called the Earth's magnetosphere by various interactions with the Earth's magnetic field. Thus the solar-terrestrial environment affects the Earth's magnetic field, which can be observed with an instrument for the magnetic field measurement, the magnetometer usually mounted on the rocket and the satellite and based on the ground observatory. The magnetometer is a useful instrument for the spacecraft attitude control as well as the Earth's magnetic field measurements for the spacecraft purpose. In this paper, we present the preliminary design and test results of the two onboard magnetometers of KARI's (Korea Aerospace Research Institute) sounding rocket, KSR-3, which will be launched four times during the period of 2001-02. The KSR-3 magnetometers consist of the fluxgate magnetometer, MAG/AIM (Attitude Information Magnetometer) for acquiring the rocket flight attitude information, and of the search-coil magnetometer, MAG/SIM (Scientific Investigation Magnetometer) for the observation of the Earth's magnetic field fluctuations. With the MAG/AIM, the 3-axis attitude information can be acquired by the comparison of the resulting dc magnetic vector field with the IGRF (International Geomagnetic Reference Field). The Earth's magnetic field fluctuations ranging from 10 to 1,000 Hz can also be observed with the MAG/SIM measurement.
912
- 김방엽
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.1
- pp.107-116
- 2000
- 원문 바로보기
본 연구는 지구 공전 궤도 근처의 Leonid의 출현 빈도와 속도 등을 예측하기 위한 연구의 초기 단계로서 meteoroid에 대한 기초 자료 조사와 더붙어 기존에 알려져 있는 meteoroid 입자의 분출 속도 모텔과 섭동 모델로부터 meteoroid의 운동 방향과 속도를 컴퓨터로 계산하기 위한 프로그램을 개발하고 이것을Leonid stream에 적용해 보았다. 입자의 초기 속도 모델로는Jones의 분출속도 분포모델을 사용하였으며, meteoroid의 궤도 운동 모델에는 태양과 달, 지구를 비롯한 각 행성들의 섭동 모델이 포함되었다. 태양계 천체들의 Ephemeris를 구하기 위해 JPL (Jet Propulsion L Laboratory)의 SSD (Solar System Dynamics) Laboratory에서 개발된 DE405 Solar System E Ephemeris 데이터 파일을 사용하였다. 이외에 중요한 섭동 요소로써 태양 복사압을 고려하였으며, 적분 알고리즘으로는 8차 Runge-Kutta 방법을 사용하였다.
913
- Lee, Byoung-Sun
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.285-294
- 2000
- 원문 바로보기
The post-launch mission analysis of the KOMPSAT-1 spacecraft was carried out. The injection accuracy of the Taurus launch vehicle was analyzed by comparison of the target and the realized orbit parameters. The tracking station contact analysis was also performed based on the state vectors applied at the day of launch. The offset angles between the predicted orbit and realized orbit were calculated for various tracking stations. The injection orbit parameters of the KOMPSAT-1 were analyzed for the possible options in Launch and Early Orbit Phase(LEOP) operations. Variations of the Local Time of Ascending Node(LTAN) were also obtained.
914
- Chung, Jong-Kyun
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.241-248
- 2000
- 원문 바로보기
A groung Fabry-Perot interferometer has been used to measure atomic oxygen nightglow (OI 630.0nm) from the thermosphere (about 250km) at King Sejong station (KSS, geographic: <TEX>$62.22^{\circ}$</TEX>S, <TEX>$301.25^{\circ}$</TEX>E; geomagnetic: <TEX>$50.65^{\circ}$</TEX>S, <TEX>$7.51^{\circ}$</TEX>E), Antarctica. While numerous studies of the thermosphere have been performed on high latitude using ground-based Fabry-Perot interferometers, the thermospheric measurements in the Southern Hemisphere are relatively new and sparse. Therefore, the nightglow measurements at KSS play an important role in extending the thermospheric studies to the Southern Hemisphere. In this study, we investigated the effects of the geomagnetic and solar activities on the thermospheric neutral temperatures that have been observed at KSS in 1989 and 1997. The measured average temperatures are 1400K in 1989 and 800K in 1997, reflecting the influence of the solar activity. The measurements were compared with empirical models, MSIS-86 and semi-empirical model, VSH.
915
- Sohn, Young-Jong
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.125-132
- 2000
- 원문 바로보기
Long-slit spectra, covering the wavelength range 4050~5150<TEX>$\AA$</TEX>, have been used to investigate the radial behavior of absorption line features (G4300, Fe4383, Ca4455, Fe4531, Fe4668, and H<TEX>$\beta$</TEX>) along the major and minor axes of the bulge of M104. The heliocentric recession velocity of M104 has been derived as 1260<TEX>$\pm$</TEX>190<TEX>${kms}^{-1}$</TEX>. The strength of a number of metal absorption lines is decreasing with increasing radius, and the minor axis shows much steeper radial line gradients than the major axis. Line index of H<TEX>$\beta$</TEX> has an opposite trend to other metal lines, i.e., increasing outward. The results in this paper imply that the properties of absorption line index distribution in M104 bulge have in many aspects similar trends to those of elliptical galaxies.
916
- Kim, Sang-Joon
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.147-150
- 2000
- 원문 바로보기
A fluorescent equilibrium model for the 1-0 band of the A-X system of <TEX>${18}^{OH}$</TEX> has been constructed. Line positions and intensities have been calculated for possible future spectroscopic observations of these bands from space in order to derive <TEX>${18}^{O}/{16}^{O}$</TEX> ratios in comets. It is demonstrated that the strong lines of the 1-0 band can be observable for a moderately bright comet using a high resolution spectrometer with a reasonable exposure time.
917
- Chung, Tae-Jin
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.257-266
- 2000
- 원문 바로보기
A satellite RF communication link is analyzed based on a simple fundamental equations by systematic approach in this paper. The number of variables related to a design and analysis of satellite RF link is often a dozen or more, thus it is a tedious and time-consuming task. With the given input data, the important parameters are calculated step by step and three communication characteristics such as communication channel capacity, carrier-to-noise ratio(CNR) at the satellite and ground station are analyzed. It gives very useful information to the system engineers for designing and analyzing the overall satellite communication system in the conceptual design phase.
918
- 오규동
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.151-162
- 2000
- 원문 바로보기
근접촉쌍성을 분광형에 따라 A형과 F형으로 분류하여 각각의 물리적 특성과 진화를 조사하였다. 그 결과, 근접촉쌍성이 TRO 이론에 따른 진화 경로를 겪는다고 가정하면, F형이 A형에 비하여 더 접촉에 가까운 즉, W UMa형에 근접한 상태에 있을 가능성이 있음을 알 수 있었다. NCBs의 질량-반경 관계, 질량-광도 관계 및 H-R도를 조사하였는데 그 결과 A형이 F형에 비하여 질량교환이 활발할 것으로 생각된다. 근접촉쌍성은 ZAMS와 평행하게 나타나며 접촉쌍성의 진화 위치와 거의 일치하고 있다.
919
- Kim, Yong-Gi
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.1
- pp.33-38
- 2000
- 원문 바로보기
Synchrotron emission at 408 MHz and HI column density have been used to find an evidence for the relationship between the Galactic magnetic field and the gas density. The observational data of the brightness temperature and HI column density, <TEX>$T_b(408)\;and \;N_{HI}$</TEX>, near the galactic plane between galactic longitudes <TEX>$l=62^{circ}\;and\;l=250^{\circ}$</TEX> show a clear linear correlation of <TEX>$T_b(408)=A(l,b)+B\;N_{HI}$</TEX>, where A(l, b)is a background and forground radiation at the galactic coordinate. We found <TEX>$(1.4{pm}0.3)10^{-21}$</TEX> for the slope B, which describes the strength of the syncrotron radiation from the HI cloud, and agrees with the value for the MIlky Way obtained by Beuermann et al. (1985). We conclude therefore that a well defined nonthermal corelates with the HI column density originating from this HI cloud.
920
- 김천휘
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.173-180
- 2000
- 원문 바로보기
아직 잘 연구 되지 않은 식쌍성 V651 Cas의 극심시각을 모두 수집하여 분석하였다. 그 결과, 이 쌍성의 공전주기가 규칙적으로 변화해 왔을 가능성을 발견하였다. 이를 제3천체에 의한 광시간 효과때문으로 가정하여 광시간 궤도요소를 구하였다. 최종적으로 구한 광시간 궤도의 주기, 반-진폭, 그리고 이심율은 각각 <TEX>$5.^y66,\;0.^d00144$</TEX>, 그리고 0.92이다. 이 논문에서 제시한 제3천체의 존재 확인을 위하여 극심시각의 많은 관측이 요구된다.