A5078777997- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Solar Radiation and Photovoltaics
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Magnetic confinement fusion research
- Fluid Dynamics and Turbulent Flows
- ZnO doping and properties
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Nonlinear Waves and Solitons
- Nonlinear Photonic Systems
- Gamma-ray bursts and supernovae
- Climate variability and models
- Gas Sensing Nanomaterials and Sensors
- Nanowire Synthesis and Applications
- Tropical and Extratropical Cyclones Research
- Advanced Fiber Laser Technologies
- Ocean Waves and Remote Sensing
- Adaptive optics and wavefront sensing
- Global Energy and Sustainability Research
- Ga2O3 and related materials
University of Sheffield
2015-2024
Eötvös Loránd University
1991-2024
Bay Zoltán Foundation for Applied Research
2020-2024
Hungarian Science and Technology Foundation
2022-2024
Applied Photonics (United Kingdom)
2024
HUN-REN Centre for Energy Research
2015-2022
Pázmány Péter Catholic University
2022
Aberystwyth University
2021
University of Science and Technology of China
2019
Research Centre for Astronomy and Earth Sciences
2015-2018
The flow of energy through the solar atmosphere and heating Sun's outer regions are still not understood. Here, we report detection oscillatory phenomena associated with a large bright-point group that is 430,000 square kilometers in area located near disk center. Wavelet analysis reveals full-width half-maximum oscillations periodicities ranging from 126 to 700 seconds originating above bright point significance levels exceeding 99%. These oscillations, 2.6 per second amplitude, coupled...
There are now many observations of waves in the solar corona with periods around 5 minutes. The source these is uncertain, although global p-modes photosphere an obvious candidate, given similarity dominant periods. However, traditionally considered evanescent upper photosphere, and it has been unclear how they could propagate through chromosphere into corona. Using a numerical model, we show that photospheric oscillations minutes can actually so long as guided along inclined magnetic flux...
The Sun's outer coronal layer exists at a temperature of millions kelvins, much hotter than the solar surface we observe. How this high is maintained and what energy sources are involved continue to puzzle fascinate researchers. Recently, Hinode spacecraft was launched observe measure plasma properties layers. data collected by reveal about role magnetic field interactions how waves might transport corona. These results open new era in high-resolution observation Sun.
Context. Observations of post-flare transversal coronal loop oscillations by TRACE have given us an excellent opportunity to implement magneto-seismological techniques for probing the plasma fine structure Sun's upper atmosphere.
In this paper, we consider the complex modified Korteweg-de Vries (mKdV) equation as a model of few-cycle optical pulses. Using Lax pair, construct generalized Darboux transformation and systematically generate first-, second-, third-order rogue wave solutions analyze nature evolution higher-order waves in detail. Based on detailed numerical analytical investigations, classify with respect to their intrinsic structure, namely, fundamental pattern, triangular ring pattern. We also present...
Spicules are rapidly evolving fine-scale jets of magnetized plasma in the solar chromosphere. It remains unclear how these prevalent originate from surface and what role they play heating atmosphere. Using Goode Solar Telescope at Big Bear Observatory, we observed spicules emerging within minutes appearance opposite-polarity magnetic flux around dominant-polarity field concentrations. Data Dynamics Observatory showed subsequent adjacent corona. The dynamic interaction fields (likely due to...
ABSTRACT Polar front jet stream variability is responsible for instances of extreme weather and crucial regional climate change. The North Atlantic Front particular significance to the heavily populated areas western Europe eastern America as storm track variability, atmospheric modes such Oscillation (NAO), temperature rainfall are all intimately linked with changes. Although seasonal interannual often attributed internal there several possible drivers polar changes that reviewed in this...
The Daniel K. Inouye Solar Telescope (DKIST) will revolutionize our ability to measure, understand and model the basic physical processes that control structure dynamics of Sun its atmosphere. first-light DKIST images, released publicly on 29 January 2020, only hint at extraordinary capabilities which accompany full commissioning five facility instruments. With this Critical Science Plan (CSP) we attempt anticipate some what those enable, providing a snapshot scientific pursuits hopes engage...
The European Solar Telescope (EST) is a project aimed at studying the magnetic connectivity of solar atmosphere, from deep photosphere to upper chromosphere. Its design combines knowledge and expertise gathered by physics community during construction operation state-of-the-art telescopes operating in visible near-infrared wavelengths: Swedish 1m (SST), German Vacuum Tower (VTT) GREGOR, French T\'elescope H\'eliographique pour l'\'Etude du Magn\'etisme et des Instabilit\'es Solaires...
We consider transverse oscillations of coronal loops that have both variable circular cross-sectional area and plasma density in the longitudinal direction. The primary focus this paper is to study eigenmodes these oscillations. Implementing method asymptotic expansions with ratio loop radius length as a small parameter, second-order ordinary differential equation derived describing displacement axis. Together boundary conditions at tube ends follow from frozen-in condition, constitutes...
In this paper, we present and discuss results of two-dimensional simulations linear nonlinear magneto-acoustic wave propagation through an open magnetic flux tube embedded in the solar atmosphere expanding from photosphere to transition region into low corona. Our aim is model analyze response such a structure vertical horizontal periodic motions originating photosphere. To carry out simulations, employed our MHD code SAC (Sheffield Advanced Code). A combination VALIIIC McWhirter atmospheres...
We present observational evidence of compressible MHD wave modes propagating from the solar photosphere through to base transition region in a magnetic pore. High cadence images were obtained simultaneously across four wavelength bands using Dunn Solar Telescope. Employing Fourier and wavelet techniques, sausage-mode oscillations displaying significant power detected both intensity area fluctuations. The fluctuations exhibit range periods 181 412 s, with an average period ∼290 consistent...
We present here evidence for the observation of magnetohydrodynamic (MHD) sausage modes in magnetic pores solar photosphere. Further omnipresent nature acoustic global is also found. The empirical decomposition method wave analysis used to identify oscillations detected through a 4170 Å "blue continuum" filter observed with Rapid Oscillations Solar Atmosphere (ROSA) instrument. Out phase, periodic behavior pore size and intensity as an indicator presence magnetoacoustic oscillations....
Observing the excitation mechanisms of incompressible transverse waves is vital for determining how energy propagates through lower solar atmosphere. We aim to show connection between convectively driven photospheric flows and chromospheric waves. The observations presented here propagation motion quiet atmosphere, from photosphere chromosphere. determine flow vectors search signatures vortex compare results present in convective simulations. Further, we response motions. Evidence that...
Abstract Coronal mass ejections (CMEs) are arguably the most violent eruptions in solar system. CMEs can cause severe disturbances interplanetary space and even affect human activities many aspects, causing damage to infrastructure loss of revenue. Fast accurate prediction CME arrival time is vital minimize disruption that may when interacting with geospace. In this paper, we propose a new approach for partial-/full halo Arrival Time Prediction Using Machine learning Algorithms (CAT-PUMA)....