120 citations · 535 across the 20 of their papers we have counts for
20 papers
Changes of Magnetic Energy and Helicity in Solar Active Regions from Major Flares
Yang Liu, Brian T. Welsch, Gherardo Valori +5
Magnetic free energy powers solar flares and coronal mass ejections (CMEs), and the buildup of magnetic helicity might play a role in the development of unstable structures that su…
Solar Flares and Magnetic Helicity
Shin Toriumi, Sung-Hong Park
Solar flares and coronal mass ejections are the largest energy release phenomena in the current solar system. They cause drastic enhancements of electromagnetic waves of various wa…
The Flare Likelihood and Region Eruption Forecasting (FLARECAST) Project: Flare forecasting in the big data & machine learning era
M. K. Georgoulis, D. S. Bloomfield, M. Piana +25
The EU funded the FLARECAST project, that ran from Jan 2015 until Feb 2018. FLARECAST had a R2O focus, and introduced several innovations into the discipline of solar flare forecas…
Magnetic Helicity Flux across Solar Active Region Photospheres: II. Association of Hemispheric Sign Preference with Flaring Activity during Solar Cycle 24
Sung-Hong Park, K. D. Leka, Kanya Kusano
In our earlier study of this series (Park et al. 2020, Paper I), we examined the hemispheric sign preference (HSP) of magnetic helicity flux across photospheric surfaces of…
Data-driven MHD simulation of successive solar plasma eruptions
Takafumi Kaneko, Sung-Hong Park, Kanya Kusano
Solar flares and plasma eruptions are sudden releases of magnetic energy stored in the plasma atmosphere. To understand the physical mechanisms governing their occurrences, three-d…
CycleQSM: Unsupervised QSM Deep Learning using Physics-Informed CycleGAN
Gyutaek Oh, Hyokyoung Bae, Hyun-Seo Ahn +2
Quantitative susceptibility mapping (QSM) is a useful magnetic resonance imaging (MRI) technique which provides spatial distribution of magnetic susceptibility values of tissues. Q…
Magnetic Helicity Flux across Solar Active Region Photospheres: I. Hemispheric Sign Preference in Solar Cycle 24
Sung-Hong Park, K. D. Leka, Kanya Kusano
A hemispheric preference in the dominant sign of magnetic helicity has been observed in numerous features in the solar atmosphere: i.e., left-handed/right-handed helicity in the no…
Time Series Analysis of Photospheric Magnetic Parameters of Flare-quiet versus Flaring Active Regions: Scaling Properties of Fluctuations
Eo-Jin Lee, Sung-Hong Park, Yong-Jae Moon
Time series of photospheric magnetic parameters of solar active regions (ARs) are used to answer whether scaling properties of fluctuations embedded in such time series help to dis…
An Observational Test of Solar Plasma Heating by Magnetic Flux Cancellation
Sung-Hong Park
Recent observations suggest that magnetic flux cancellation may play a crucial role in heating the Sun's upper atmosphere (chromosphere, transition region, corona). Here, we intend…
A Comparison of Flare Forecasting Methods. IV. Evaluating Consecutive-Day Forecasting Patterns
Sung-Hong Park, K. D. Leka, Kanya Kusano +21
A crucial challenge to successful flare prediction is forecasting periods that transition between "flare-quiet" and "flare-active". Building on earlier studies in this series (Barn…
Onset Mechanism of M6.5 Solar Flare Observed in Active Region 12371
Jihye Kang, Satoshi Inoue, Kanya Kusano +2
We studied a flare onset process in terms of stability of a three-dimensional (3D) magnetic field in active region 12371 producing an eruptive M6.5 flare in 2015 June 22. In order…
Which Photospheric Characteristics are Most Relevant to Active-Region Coronal Mass Ejections?
Ioannis Kontogiannis, Manolis K. Georgoulis, Jordan A. Guerra +2
We investigate the relation between characteristics of coronal mass ejections and parameterizations of the eruptive capability of solar active regions widely used in solar flare pr…
A Comparison of Flare Forecasting Methods. III. Systematic Behaviors of Operational Solar Flare Forecasting Systems
K. D. Leka, Sung-Hong Park, Kanya Kusano +21
A workshop was recently held at Nagoya University (31 October - 02 November 2017), sponsored by the Center for International Collaborative Research, at the Institute for Space-Eart…
A Comparison of Flare Forecasting Methods. II. Benchmarks, Metrics and Performance Results for Operational Solar Flare Forecasting Systems
K. D. Leka, Sung-Hong Park, Kanya Kusano +21
Solar flares are extremely energetic phenomena in our Solar System. Their impulsive, often drastic radiative increases, in particular at short wavelengths, bring immediate impacts…
Flare Productivity of Major Flaring Solar Active Regions: A Time-series Study of Photospheric Magnetic Properties
Eo-Jin Lee, Sung-Hong Park, Yong-Jae Moon
A solar active region (AR) that produces at least one M- or X-class major flare tends to produce multiple flares during its passage across the solar disk. It will be interesting if…
Magnetohydrodynamic Modeling of a Solar Eruption Associated with X9.3 Flare Observed in Active Region 12673
Satoshi Inoue, Daikou Shiota, Yumi Bamba +1
On SOL2017-09-06 solar active region 12673 produced an X9.3 flare which is regarded as largest to occur in solar cycle 24. In this work we have preformed a magnetohydrodynamic (MHD…
Photospheric Shear Flows in Solar Active Regions and Their Relation to Flare Occurrence
Sung-Hong Park, Jordan A. Guerra, Peter T. Gallagher +2
Solar active regions (ARs) that produce major flares typically exhibit strong plasma shear flows around photospheric magnetic polarity inversion lines (MPILs). It is therefore impo…
Testing and Improving a Set of Morphological Predictors of Flaring Activity
Ioannis Kontogiannis, Manolis K. Georgoulis, Sung-Hong Park +1
Efficient prediction of solar flares relies on parameters that quantify the eruptive capability of solar active regions. Several such quantitative predictors have been proposed in…
Connecting Coronal Mass Ejections to their Solar Active Region Sources: Combining Results from the HELCATS and FLARECAST Projects
Sophie A. Murray, Jordan A. Guerra, Pietro Zucca +5
Coronal mass ejections (CMEs) and other solar eruptive phenomena can be physically linked by combining data from a multitude of ground-based and space-based instruments alongside m…
Non-neutralized electric currents in solar active regions and flare productivity
Ioannis Kontogiannis, Manolis K. Georgoulis, Sung-Hong Park +1
We explore the association of non-neutralized currents with solar flare occurrence in a sizable sample of observations, aiming to show the potential of such currents in solar flare…