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1984년 ~ 2024년까지 1,246 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 : 1,246건 (DB Construction : 1,246 Articles)
총 게시글 1,246건
페이지 92/125
911
- 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.
912
- 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.
913
- 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.
914
- 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.
915
- 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.
916
- 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.
917
- 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.
918
- Lee, D.Y.
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.141-146
- 2000
- 원문 바로보기
Some observational features on the July 5, 1995 substorm event are presented using the data from the Geotail satellite which was located at near-Earth plasma sheet, <TEX>${X}_{GSE}$</TEX> ∼ <TEX>$-9.6R_{E}$</TEX>, and quite close to the onset sector. Near-tail magnetic field reveals the typical dipolarizations starting ar ∼ 11-4 UT until ∼ 1113 UT. During the interval, two dipolarizations occur: First dipolarization is not strong and accompanies only weak(<150km/s) earthward/dawnward plasma flows, and in the second dipolarization that follows shortly, rather large amplitude magnetic fluctuations are seen, but it initiates with no significant earthward flow. The earthward bursty flow with a maximum speed of > 450km/s was observed, but delayed by ∼ 1 min with respect to the second dipolarization initiation. These features are in conflict with the flow-braking scenario for the substorm. Rather they fit better in the near-tail current disruption scenario.
919
- Sohn, Young-Jong
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.1
- pp.1-10
- 2000
- 원문 바로보기
To derive the metallicities of M3 and M5, we used the shape of red giant branch, horizontal branch magnitude, and red giant branch bump on the (V-I)-V color magnitude diagrams. [Fe/H] values ranging -1.46 ∼ -1.69 for M3, and -1.00 ∼ -1.49 for M5 are estimated. These values are in good agreements with the previously determined ones. This result leads the morphologies of red giant and horizontal branches on the (V-I)-V color magnitude diagrams can be good indirect metallicity indicators of galactic globular clusters.
920
- 오규동
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.163-172
- 2000
- 원문 바로보기
주성과 반성의 온도차가 큰 <TEX>$(\mid\bigtriangleup T\mid\geq1,000K)$</TEX> EB형 접촉식쌍성에 WD 모웰의 모드 3을 적용 할 경우, 주성과 반성의 표면 반사율 (A), 주변감광계수 (x) 그리고 중력강광계수 (g)가 각각 서로 같은 값을 갖는 일반적인 경우와 각각 서로 다른 값을 갖도록 수정된 모드 3의 경우를 비교 분석하였다. EB형 접촉식쌍성인 DO Cas, GO Cyg 그리고 FS Lup에 적용한 결과, 수정된 모드 3에 의해 얻은 이론적인 광도곡선이 관측된 광도곡선을 더 잘 만족하고 있음을 확인하였다.