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1968년 ~ 2024년까지 1,211 건의 한국천문학회지를 격월간 확인하실 수 있습니다.
- The Korean Astronomical Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-4614 (ISSN : 1225-4614)
1225-4614
- DB구축현황 : 1,211건 (DB Construction : 1,211 Articles)
총 게시글 1,211건
페이지 85/122
841
- KIM SANG CHUL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.83-84
- 1996
- 원문 바로보기
842
- DRURY L O'C
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.267-270
- 1996
- 원문 바로보기
The problem of the origin of cosmic rays is considered in an astronomical context and the current observational situation summarised. The evidence for acceleration in supernova remnants is critically examined.
843
- SAHNI V.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.19-21
- 1996
- 원문 바로보기
We apply topological measures of clustering such as percolation and genus curves (PC & GC) and shape statistics to a set of scale free N-body simulations of large scale structure. Both genus and percolation curves evolve with time reflecting growth of non-Gaussianity in the N-body density field. The amplitude of the genus curve decreases with epoch due to non-linear mode coupling, the decrease being more noticeable for spectra with small scale power. Plotted against the filling factor GC shows very little evolution - a surprising result, since the percolation curve shows significant evolution for the same data. Our results indicate that both PC and GC could be used to discriminate between rival models of structure formation and the analysis of CMB maps. Using shape sensitive statistics we find that there is a strong tendency for objects in our simulations to be filament-like, the degree of filamentarity increasing with epoch.
844
- LAI S. P.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.327-328
- 1996
- 원문 바로보기
845
- WATANABE TETSUYA
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.291-294
- 1996
- 원문 바로보기
The .Japanese sun observing satellite, Yohkoh, has been operational for five years and her scientific instruments are still in good condition. They have revealed ample of evidences that solar flares were triggered by magnetic reconnection, which was, for the first time, clearly indicated to take place in the solar corona. Cusp structures in soft X-rays and a new type of hard X-ray sources at the top of flaring loops have strongly supported the scenario originally proposed by C-S-H-KP. Nonthermal energy input in hard X-rays and thermal energy estimated from soft X-rays are fundamentally consistent with the interpretation of thick-target and chromospheric-evaporation models (Neupert effect). X-ray jets, another discovery of Yohkoh, were also associated with magnetic reconnection, as a result of the interaction of emerging fluxes with pre-existing coronal loops. Temperature structures of active regions, quiet sun, and coronal holes had very dynamic differential-emission-measure (DEM) distributions and high-temperature tails of DEM were considered to come from the contribution of flare-like activity.
846
- LEE GEUNHO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.459-460
- 1996
- 원문 바로보기
847
- Xu WENLI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.399-400
- 1996
- 원문 바로보기
LAMOST is a special reflecting Schmidt telescope. Both the refleting Schmidt plate <TEX>$M_A$</TEX> and the spherical primary mitrror <TEX>$M_B$</TEX> are segmened mirrors. These two cofocus but not co-phase. The diffraction of the optical system is decided by the shape overlapping of <TEX>$M_A$</TEX> and <TEX>$M_B$</TEX>. This paper describes the diffraction caculating results with different declination and different field angle. The diffraction influence to the image quality is acceptable in the error buget of optical system. It also proves that the size seletion of the sub-mirror is reasonable.
848
- ALMLEAKY Y. M.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.317-319
- 1996
- 원문 바로보기
Utilizing a Calcium filter, a large two ribbon flare of an importance 2.5Xj31? was recorded at. King Abdul-Aziz University Solar Observatory (KAAUSO) at the 30th of October 1991. This chromosphenc flare observation, which is of special importance since it is rarely reported, was for a flare that occurred near the south west of the equator at the vicinity of a large sunspot group on an active region known as AR 6891. The observed foot points of this flare had a strange behavior in which the separating motion of the ribbons were not typical of most flares, rather were nearly orthogonal. In this article we present the characteristics of the main sunspot group of this active region and try to investigate its evolution and fragmentation with time. Information regarding magnetic fields and velocity fields are necessary to understand the restructuring of the magnetic field pattern and plasma motion, and hence the changes that could lead to the occurrence of such an interesting flare.
849
- TAKAHARA FUMIO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.99-102
- 1996
- 원문 바로보기
I discuss implications of gamma-ray emission from blazars based on electron acceleration by shock waves in a relativistic jet. The number spectrum of electrons turns out to be a broken power law; while at low energies the power law index has a universal value of 2, at high energies it steepens to an index of 3 because of strong radiative cooling. This spectrum can basically reproduce the observed spectral break between X-rays and gamma-rays. I show that energetics of relativistic jets can be well explained by this model. I estimate physical quantities of the relativistic jets by comparing the prediction with observations. The results show that the jets are particle dominated and are comprised of electron-positron pairs. A connection between gamma-ray emission and radiation drag is also discussed.
850
- KIM JONG BOCK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.15-16
- 1996
- 원문 바로보기
We discuss the possible ranges of electron neutrino degeneracy which is consistent with the inferred primordial abundances of the light elements. It is found that the electron neutrino degeneracy, [<TEX>${\epsilon}_e$</TEX>], up to order of <TEX>$10^{-1}$</TEX> is consistent with the present data.