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of 121
pro vyhledávání: '"Chang, Heon-Young"'
Autor:
Chang, Heon-Young
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 36, Iss 4, Pp 225-234 (2019)
We explore the associations between the total sunspot area, solar north-south asymmetry, and Southern Oscillation Index and the physical characteristics of clouds by calculating normalized cross-correlations, motivated by the idea that the galactic c
Externí odkaz:
https://doaj.org/article/e10e09e5084c4d2aa44573e4c11c7e88
Autor:
Lee, Byeong-Cheol, Do, Hee-Jin, Park, Myeong-Gu, Lim, Beomdu, Choi, Yeon-Ho, Koo, Jae-Rim, Bang, Tae-Yang, Oh, Hyeong-Ill, Han, Inwoo, Chang, Heon-Young
Context. Certain periodic variations of radial velocities (RV) of wobbling giants originate from exoplanets. Indeed, a number of exoplanets have been discovered around giant stars. Aims. The purpose of our study is to find low-amplitude and long-peri
Externí odkaz:
http://arxiv.org/abs/2307.15897
Autor:
Kim, Ki-Beom, Chang, Heon-Young
Publikováno v:
In New Astronomy April 2022 92
Using Gaussian Mixture Model (GMM) and Expectation Maximization Algorithm, we perform an analysis of time duration ($T_{90}$) for \textit{CGRO}/BATSE, \textit{Swift}/BAT and \textit{Fermi}/GBM Gamma-Ray Bursts. The $T_{90}$ distributions of 298 redsh
Externí odkaz:
http://arxiv.org/abs/1603.03680
Autor:
Li, Long-Biao, Zhang, Zhi-Bin, Huang, Yong-Feng, Wu, Xue-Feng, Kong, Si-Wei, Li, Di, Chang, Heon-Young, Choi, Chul-Sung
Considering the contribution of the emission from the host galaxies of gamma-ray bursts (GRBs) to the radio afterglows, we investigate the effect of host galaxies on observations statistically. For the three types of events, e.g. low-luminosity, stan
Externí odkaz:
http://arxiv.org/abs/1505.00311
Akademický článek
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We explore the detection condition of a wide-separation planet through the perturbation induced by the planetary caustic for various microlensing parameters, especially for the size of the source stars. By constructing the fractional deviation maps a
Externí odkaz:
http://arxiv.org/abs/1306.1005
Autor:
Chang, Heon-Young
We study the latitudinal distribution of sunspots observed from 1874 to 2009 using the center-of-latitude (COL). We calculate COL by taking the area-weighted mean latitude of sunspots for each calendar month. We then form the latitudinal distribution
Externí odkaz:
http://arxiv.org/abs/1108.1242
Autor:
Cho, Il-Hyun, Kwak, Young-Sil, Marubashi, Katsuhide, Kim, Yeon-Han, Park, Young-Deuk, Chang, Heon-Young
We explore a possibility that the daily sea-level pressure (SLP) over South Korea responds to the high-speed solar wind event. This is of interest in two aspects: First, if there is a statistical association this can be another piece of evidence show
Externí odkaz:
http://arxiv.org/abs/1107.1841
Autor:
Cho, Il-Hyun, Kwak, Young-Sil, Chang, Heon-Young, Cho, Kyung-Suk, Park, Young-Deuk, Choi, Ho-Sung
We investigate the dependence of the amount of the observed galactic cosmic ray (GCR) influx on the solar North-South asymmetry using the neutron count rates obtained from four stations and sunspot data in archives spanning six solar cycles from 1953
Externí odkaz:
http://arxiv.org/abs/1103.4255