Jae‐Hyuck Youn

Benchmarking Deep Learning Models for Real‐Time Prediction of Post‐Peak Solar Flare Irradiance Using FISM2 Data

Jeong‐Heon Kim, Jae‐Hyuck Youn, Sung‐Hong Park, Seungwoo Ahn et autres

Abstract This study presents a deep learning framework for real‐time prediction of post‐peak solar flare irradiance. The model targets the soft X‐ray band (0.1–0.8 nm) and three extreme ultraviolet (EUV) wavelength bands (9.0–9.9 nm, 13.0–13.9 nm, and 30.0–30.9 nm), and produces forecasts …

kr, au, us (code pays fourni par la source)

Application of Deep Learning and Explainable AI to NIR Auroral Detection in Satellite Time‐Series Images

Jae‐Hyuck Youn, Serin Jeon, Woong Jeon, Se‐Heon Jeong et autres

Abstract In this study, we employ a deep learning approach to detect auroras from near‐infrared (NIR) sequential images captured by the satellite‐based imager, the Enhanced Polar Outflow Probe (e‐POP)/Fast Auroral Imager (FAI). We also apply the Eigen‐Class Activation Map (Eigen‐CAM), an explainable …

kr (code pays fourni par la source)

Artificial-intelligence-based Reconstruction of Solar Farside Vector Magnetograms from Multispacecraft Extreme-ultraviolet Data

Hyun-Jin Jeong, Eunsu Park, Harim Lee, Jae‐Hyuck Youn et autres

Abstract In this study, we generate full-disk vector magnetic field data of the solar farside, as viewed from the Solar Terrestrial Relations Observatory-Ahead (STEREO-A), Solar Terrestrial Relations Observatory-Behind (STEREO-B), and Solar Orbiter (SolO), using a deep learning model based on the Pix2PixCC …

Fine Structures of Tiny Quiet Sun Jets Observed by Solar Orbiter and Big Bear Solar Observatory

Jeongwoo Lee, D. W. Longcope, Jae‐Hyuck Youn, Navdeep K. Panesar et autres

Abstract We present the first joint high-resolution observations of small-scale EUV jets using Solar Orbiter (SolO)’s Extreme Ultraviolet Imager and High Resolution Imager (EUI/HRIEUV) and Hα imaging from the Visible Imaging Spectrometer installed on the 1.6 m Goode Solar Telescope at the …

us, kr, gb (code pays fourni par la source)

Exploring the Potential of DEM Analysis Using Solar Orbiter/EUI and AI-Generated Data

Jae‐Hyuck Youn, Harim Lee, Hyun-Jin Jeong, Jin‐Yi Lee et autres

In this study, we determine the differential emission measures (DEMs) using Solar Orbiter/Extreme Ultraviolet Imager (EUI)/Full Sun Imager (FSI) and AI-generated EUV data. The FSI observes only two full-disk extreme UV (EUV) channels (174 and 304 Å), which poses a limitation for …

kr, be (code pays fourni par la source)

Can we properly determine differential emission measures from Solar Orbiter/EUI/FSI with deep learning?

Jae‐Hyuck Youn, Harim Lee, Hyun-Jin Jeong, Jin‐Yi Lee et autres

In this study, we address the question of whether we can properly determine differential emission measures (DEMs) using Solar Orbiter/Extreme Ultraviolet Imager (EUI)/Full Sun Imager (FSI) and AI-generated extreme UV (EUV) data. The FSI observes only two full-disk EUV channels (174 and …

kr, be (code pays fourni par la source)

VizieR Online Data Catalog: Long-term CCD photometry of the EB 2M1533+3759 (Lee+, 2017)

J. W. Lee, Jae‐Hyuck Youn, Kyeongsoo Hong, Han Wen-jun

Physical Properties of the Low-Mass Eclipsing Binary NSVS 02502726

Jae Woo Lee, Jae‐Hyuck Youn, Seung‐Lee Kim, Chung‐Uk Lee

NSVS 02502726 has been known as a double-lined, detached eclipsing binary that consists of two low-mass stars. We obtained $BVRI$ photometric follow-up observations in 2009 and 2011 to measure improved physical properties of the binary star. Each set of light curves, including …

kr (code pays fourni par la source)

KIC 4739791: A NEW R CMa-TYPE ECLIPSING BINARY WITH A PULSATING COMPONENT

Jae Woo Lee, Seung‐Lee Kim, Kyeongsoo Hong, Jae‐Rim Koo et autres

ABSTRACT The Kepler light curve of KIC 4739791 exhibits partial eclipses, the inverse O’Connell effect, and multiperiodic pulsations. Including a starspot on either of the binary components, the light-curve synthesis indicates that KIC 4739791 is in detached or semi-detached configuration with both …

kr (code pays fourni par la source)

The pulsating sdB+M eclipsing system NY Virginis and its circumbinary planets

Jae Woo Lee, T. C. Hinse, Jae‐Hyuck Youn, Wonyong Han

We searched for circumbinary planets orbiting NY Vir in historical eclipse times including our long-term CCD data. Sixty-eight times of minimum light with accuracies better than 10 s were used for the ephemeris computations. The best fit to those timings indicated that …

kr, gb (code pays fourni par la source)

The Pulsating sdB+M Eclipsing System NY Virginis and its Circumbinary Planets

Jae Woo Lee, T. C. Hinse, Jae‐Hyuck Youn, Wonyong Han

We searched for circumbinary planets orbiting NY Vir in historical eclipse times including our long-term CCD data. Sixty-eight times of minimum light with accuracies better than 10 s were used for the ephemeris computations. The best fit to those timings indicated that …

kr, gb (code pays fourni par la source)

VizieR Online Data Catalog: Transit light curves of HAT-P-12 (Lee+, 2012)

J. W. Lee, Jae‐Hyuck Youn, Sangwook Kim, C. U. Lee et autres