R. Erdélyi
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View article: Propagation and energy dissipation of shock waves in the solar chromosphere
Propagation and energy dissipation of shock waves in the solar chromosphere Open
The solar atmosphere is permeated by various types of waves that originate from subsurface convection. As these waves propagate upward, they encounter they encounter a steep decrease in the density of the medium, leading to their steepenin…
View article: Where Do Solar Storms Prefer to Originate From: Hemispheric and Longitudinal Patterns in Solar Cycles 23 and 24
Where Do Solar Storms Prefer to Originate From: Hemispheric and Longitudinal Patterns in Solar Cycles 23 and 24 Open
Using synoptic maps, we analyzed the relationship between active longitudes, the most populated longitudes of energetic flares, the distribution of magnetically complex active regions, and the preferred locations of those that produced the…
View article: The Relation between Solar Spicules and Magnetohydrodynamic Shocks
The Relation between Solar Spicules and Magnetohydrodynamic Shocks Open
Spicules are thin, elongated, jet-like features seen in observations of the solar atmosphere, at the interface between the solar photosphere and the corona. These features exhibit highly complex dynamics and are a necessary connecting link…
View article: Understanding the Magnetic Field and Plasma-<i>β</i> along Umbral Fan Loops Traced Using 3 Minute Slow Waves
Understanding the Magnetic Field and Plasma-<i>β</i> along Umbral Fan Loops Traced Using 3 Minute Slow Waves Open
Plasma- β is an important fundamental physical quantity in solar plasma physics, which determines the dominating process in the solar atmosphere, i.e., magnetic or thermodynamic processes. Here, for the first time, we provide variations of…
View article: Nonparallel Wave Propagation in an Asymmetric Magnetic Slab
Nonparallel Wave Propagation in an Asymmetric Magnetic Slab Open
Theoretical and numerical analyses of the behavior of magnetohydrodynamic (MHD) waves in solar atmospheric structures have a vital role in understanding the plasma dynamics of the Sun. Magneto-helioseismology is indebted to the insight gai…
View article: High-frequency leaky standing sausage and kink mode waves in magnetic slab
High-frequency leaky standing sausage and kink mode waves in magnetic slab Open
The theoretical framework for analyzing wave and oscillatory behavior in the structured solar corona using slab geometry, where space is filled with uniform low-β plasma, is considered as one of the prominent models for a number of magneti…
View article: Improving the Γ-functions method for vortex identification
Improving the Γ-functions method for vortex identification Open
Context. Vortices have been observed at various heights within the solar atmosphere and are suggested to play a significant role in heating the solar upper atmosphere. Multiple automated vortex detection methods have been developed and app…
View article: Improving the Γ-functions Method for Vortex Identification
Improving the Γ-functions Method for Vortex Identification Open
Vortices have been observed at various heights within the solar atmosphere and are suggested to potentially play great roles in heating the solar upper atmosphere. Multiple automated vortex detection methods have been developed and applied…
View article: Coronal jet Identification with machine learning
Coronal jet Identification with machine learning Open
Coronal jets are narrow eruptions observable across various wavelengths, primarily driven by magnetic activity. These phenomena may play a pivotal role in solar activity, which significantly impacts the dynamics of the solar system, howeve…
View article: Magnetic flux rope evolution and stability in data-driven coronal magnetic field simulations
Magnetic flux rope evolution and stability in data-driven coronal magnetic field simulations Open
Data-driven simulations of the solar corona have gathered traction in recent years for modelling the destabilisation of magnetic flux ropes (MFRs). To correctly apply and interpret results from these modelling efforts, it is crucial to und…
View article: A Bias-free Deep Learning Approach for Automated Sunspot Segmentation
A Bias-free Deep Learning Approach for Automated Sunspot Segmentation Open
Solar activities significantly influence space weather and the Earth’s environment, necessitating accurate and efficient sunspot detection. This study explores deep learning methods to automate sunspot identification in solar satellite ima…
View article: Photospheric Swirls in a Quiet-Sun Region
Photospheric Swirls in a Quiet-Sun Region Open
Swirl-shaped flow structures have been observed throughout the solar atmosphere, in both emission and absorption, at different altitudes and locations, and are believed to be associated with magnetic structures. However, the distribution p…
View article: Long-term properties of coronal off-limb structures
Long-term properties of coronal off-limb structures Open
Context. Extracting plasma structures in the solar corona (e.g. jets, loops, prominences) from spacecraft imagery data is essential in order to ascertain their unique properties and for our understanding of their evolution. Aims. Hence, ou…
View article: Photospheric Swirls in a Quiet-Sun Region
Photospheric Swirls in a Quiet-Sun Region Open
Swirl-shaped flow structures have been observed throughout the solar atmosphere, in both emission and absorption, at different altitudes and locations, and are believed to be associated with magnetic structures. However, the distribution p…
View article: Magnetohydrodynamic Instabilities of Double Magnetic Bands in a Shallow-water Tachocline Model. II. Teleconnection Between High- and Low-latitude Bands and Across Equator
Magnetohydrodynamic Instabilities of Double Magnetic Bands in a Shallow-water Tachocline Model. II. Teleconnection Between High- and Low-latitude Bands and Across Equator Open
The “extended solar cycle” indicates that there are two deeply seated toroidal magnetic field bands in each hemisphere. Both bands migrate equatorward as a sunspot cycle progresses. Here, we examine the consequences of global MHD instabili…
View article: The effect of data-driving and relaxation models on magnetic flux rope evolution and stability
The effect of data-driving and relaxation models on magnetic flux rope evolution and stability Open
Context. Understanding the flux rope eruptivity and effects of data driving in modelling solar eruptions is crucial for correctly applying different models and interpreting their results. Aims. We aim to investigate these by analysing the …
View article: On the Formation Height of Low-corona and Chromospheric Channels of the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO)
On the Formation Height of Low-corona and Chromospheric Channels of the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) Open
The multiwavelength data from the Solar Dynamics Observatory is extensively used in studying the physics of the Sun and its atmosphere. In this study, we estimate the formation heights of low-corona and chromospheric channels of the Atmosp…
View article: Exploring Spatial and Temporal Patterns in the Debrecen Solar Faculae Database: Part II
Exploring Spatial and Temporal Patterns in the Debrecen Solar Faculae Database: Part II Open
In this study, utilizing data from the Solar Dynamics Observatory/Helioseismic and Magnetic Imager–Debrecen Faculae Data Catalogue, we investigated solar facula distribution over timescales much larger than the individual lifetimes of facu…
View article: The effect of data-driving and relaxation model on magnetic flux rope evolution and stability
The effect of data-driving and relaxation model on magnetic flux rope evolution and stability Open
We investigate the effect of data-driving on flux rope eruptivity in magnetic field simulations by analysing fully data-driven modelling results of active region (AR) 12473 and AR11176, as well as preforming relaxation runs for AR12473 (fo…
View article: Numerical Experiment on the Influence of Granulation-induced Waves on Solar Chromosphere Heating and Plasma Outflows in a Magnetic Arcade
Numerical Experiment on the Influence of Granulation-induced Waves on Solar Chromosphere Heating and Plasma Outflows in a Magnetic Arcade Open
This paper offers a fresh perspective on solar chromosphere heating and plasma outflows, focusing on the contribution of waves generated by solar granulation. Utilizing a 2.5D numerical experiment for the partially ionized lower solar atmo…
View article: Case Studies on Pre-eruptive X-class Flares using R-value in the Lower Solar Atmosphere
Case Studies on Pre-eruptive X-class Flares using R-value in the Lower Solar Atmosphere Open
The R -value is a measure of the strength of photospheric magnetic polarity inversion lines in active regions (ARs). This work investigates the possibility of a relation between R -value variations and the occurrence of X-class flares in A…
View article: Magnetohydrodynamic Waves in Asymmetric Waveguides and Their Applications in Solar Physics—A Review
Magnetohydrodynamic Waves in Asymmetric Waveguides and Their Applications in Solar Physics—A Review Open
The solar atmosphere is a complex, coupled, highly dynamic plasma environment, which shows rich structuring due to the presence of gravitational and magnetic fields. Several features of the Sun’s atmosphere can serve as guiding media for m…
View article: On the formation height of low-corona and chromospheric channels of the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO)
On the formation height of low-corona and chromospheric channels of the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO) Open
The multi-wavelength data from the Solar Dynamics Observatory (SDO) is extensively used in studying the physics of the Sun and its atmosphere. In this study, we estimate the formation heights of low-corona and chromospheric channels of the…
View article: Dependence of Spicule Properties on the Magnetic Field—Results from Magnetohydrodynamics Simulations
Dependence of Spicule Properties on the Magnetic Field—Results from Magnetohydrodynamics Simulations Open
Solar spicules are plasma jets observed in the interface region between the visible solar surface and the corona. At any given time, there is a forest of spicules originating in the chromosphere of the Sun. While various models attempt to …
View article: Improving the Automated Coronal Jet Identification with U-NET
Improving the Automated Coronal Jet Identification with U-NET Open
Coronal jets are one of the most common eruptive activities in the solar atmosphere. They are related to rich physics processes, including, but not limited to, magnetic reconnection, flaring, instabilities, and plasma heating. Automated id…
View article: Case studies on pre-eruptive X-class flares using R-value in the lower solar atmosphere
Case studies on pre-eruptive X-class flares using R-value in the lower solar atmosphere Open
The R-value is a measure of the strength of photospheric magnetic Polarity Inversion Lines (PILs) in Active Regions (ARs). This work investigates the possibility of a relation between R-value variations and the occurrence of X-class flares…
View article: Improving the Automated Coronal Jet Identification with U-NET
Improving the Automated Coronal Jet Identification with U-NET Open
Coronal jets are one of the most common eruptive activities in the solar atmosphere. They are related to rich physics processes, including but not limited to magnetic reconnection, flaring, instabilities, and plasma heating. Automated iden…
View article: Spinning solar jets explained through the interplay between plasma sheets and vortex columns
Spinning solar jets explained through the interplay between plasma sheets and vortex columns Open
Bunches of swaying and spinning plasma jets in the solar atmosphere - the spicules - exhibit a variety of complex dynamics that are clearly observed in the images of the solar limb. Utilizing three-dimensional radiative magnetohydrodynamic…
View article: Dependence of Spicule Properties on the Magnetic Field -- Results from Magnetohydrodynamics Simulations
Dependence of Spicule Properties on the Magnetic Field -- Results from Magnetohydrodynamics Simulations Open
Solar spicules are plasma jets observed in the interface region between the visible solar surface and the corona. At any given time, there are millions of spicules present all over the Sun. While various models attempt to elucidate their o…
View article: Long-period oscillations in the lower solar atmosphere prior to flare events
Long-period oscillations in the lower solar atmosphere prior to flare events Open
Context. Multiple studies have identified a range of oscillation periods in active regions, from 3−5 min to long-period oscillations that last from tens of minutes to several hours. Recently, it was also suggested that these periods are co…