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Article
Open AccessPropagation of Leaky MHD Waves at Discontinuities with Tilted Magnetic Field
We investigate the characteristics of magneto-acoustic surface waves propagating at a single density interface, in the presence of an inclined magnetic field. For linear wave propagation, the dispersion relati...
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Article
Open AccessMagnetoacoustic Waves and the Kelvin–Helmholtz Instability in a Steady Asymmetric Slab
Recent observations have shown that bulk flow motions in structured solar plasmas, most evidently in coronal mass ejections (CMEs), may lead to the formation of Kelvin–Helmholtz instabilities (KHIs). Analytica...
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Article
Open AccessPeriod Increase and Amplitude Distribution of Kink Oscillation of Coronal Loop
Coronal loops exist ubiquitously in the solar atmosphere. These loops puzzle astronomers over half a century. Solar magneto-seismology (SMS) provides a unique way to constrain the physical parameters of corona...
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Article
Open AccessEffects of Steady Flow on Magnetoacoustic-Gravity Surface Waves: I. The Weak Field Case
Magnetoacoustic gravity (MAG) waves have been studied for some time. In this article, we investigate the effect that a shear flow at a tangential discontinuity embedded in a gravitationally stratified and magn...
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Article
Open AccessPropagation of Long-Wavelength Nonlinear Slow Sausage Waves in Stratified Magnetic Flux Tubes
The propagation of nonlinear, long-wavelength, slow sausage waves in an expanding magnetic flux tube, embedded in a non-magnetic stratified environment, is discussed. The governing equation for surface waves, ...
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Article
Open AccessLinear MHD Wave Propagation in Time-Dependent Flux Tube
In this article, we evaluate the time-dependent wave properties and the dam** rate of propagating fast magneto-hydrodynamic (MHD) waves when energy leakage into a magnetised atmosphere is considered. By cons...
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Article
Non-homogeneous Behaviour of the Spatial Distribution of Macrospicules
In this paper the longitudinal and latitudinal spatial distribution of macrospicules is examined. We found a statistical relationship between the active longitude (determined by sunspot groups) and the longitu...
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Article
A Fast MHD Code for Gravitationally Stratified Media using Graphical Processing Units: SMAUG
Parallelization techniques have been exploited most successfully by the gaming/graphics industry with the adoption of graphical processing units (GPUs), possessing hundreds of processor cores. The opportunity ...
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Article
Resonant Dam** of Propagating Kink Waves in Time-Dependent Magnetic Flux Tube
We explore the notion of resonant absorption in a dynamic time-dependent magnetised plasma background. Very many works have investigated resonance in the Alfvén and slow MHD continua under both ideal and dissi...
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Article
Linear MHD Wave Propagation in Time-Dependent Flux Tube
The propagation of magnetohydrodynamic (MHD) waves is an area that has been thoroughly studied for idealised static and steady state magnetised plasma systems applied to numerous solar structures. By applying ...
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Article
Linear MHD Wave Propagation in Time-Dependent Flux Tube
MHD waves and oscillations in sharply structured magnetic plasmas have been studied for static and steady systems in the thin tube approximation over many years. This work will generalize these studies by intr...
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Article
Effects of Stratification and Flows on P 1/P 2 Ratios and Anti-node Shifts Within Closed Loop Structures
The solar atmosphere is a dynamic environment, constantly evolving to form a wide range of magnetically dominated structures (coronal loops, spicules, prominences, etc.) which cover a significant percentage of th...
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Article
Alfvén Waves in the Solar Atmosphere
Alfvén waves are considered to be viable transporters of the non-thermal energy required to heat the Sun’s quiescent atmosphere. An abundance of recent observations, from state-of-the-art facilities, have repo...
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Article
Statistical Analysis of Small Ellerman Bomb Events
The properties of Ellerman bombs (EBs), small-scale brightenings in the Hα line wings, have proved difficult to establish because their size is close to the spatial resolution of even the most advanced telesco...
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Article
Effect of Variable Background on an Oscillating Hot Coronal Loop
We investigate the effect of a variable, i.e. time-dependent, background on the standing acoustic (i.e. longitudinal) modes generated in a hot coronal loop. A theoretical model of 1D geometry describing the coron...
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Article
Multiwavelength Observations of Supersonic Plasma Blob Triggered by Reconnection-Generated Velocity Pulse in AR10808
Using multi-wavelength observations of Solar and Heliospheric Observatory (SoHO)/Michelson Doppler Imager (MDI), Transition Region and Coronal Explorer (TRACE, 171 Å), and Hα from Culgoora Solar Observatory at Na...
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Article
Multiwavelength Observations of a Failed Flux Rope in the Eruption and Associated M-Class Flare from NOAA AR 11045
We present the multiwavelength observations of a flux rope that was trying to erupt from NOAA AR 11045 and the associated M-class solar flare on 12 February 2010 using space-based and ground-based observations...
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Article
Dam** of Longitudinal Magneto–Acoustic Oscillations in Slowly Varying Coronal Plasma
We investigate the propagation of MHD waves in a magnetised plasma in a weakly stratified atmosphere, representative of hot coronal loops. In most earlier studies, a time-independent equilibrium was considered...
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Article
Observational Signatures of Impulsively Heated Coronal Loops: Power-Law Distribution of Energies
It has been established that small scale heating events, known as nanoflares, are important for solar coronal heating if the power-law distribution of their energies has a slope α steeper than −2 (α<−2). Forward ...
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Chapter and Conference Paper
MHD Wave Heating Diagnostics
Analyzing the structure of solar coronal loops is crucial to our understanding of the processes that heat and maintain the coronal plasma at multimillion degree temperatures. The determination of the physical ...
