Abstract The influence of shear flow on resonant absorption is theoretically investigated for propagating magnetohydrodynamic body modes in cusp (slow) and Alfvén continua a cylindrical flux tube under photospheric conditions. An analytical dispersion relation the presence developed by assuming thin boundary layer. numerical solutions reveal that has rather negative impact mode compared to surface modes. As increases, it first slightly increases strength forward then decreases below no case...

Aims. General analytical formulas for the damping rate by resonant absorption of slow sausage modes in (cusp) continuum are derived and surface mode under photospheric conditions is investigated.

In order to analyze the genetic diversity and phylogenetic status of Korean Chikso breed, we determined sequences mtDNA cytochrome b (cyt b) gene performed analysis using 239 individuals from 5 populations. Five non-synonymous mutations a total 15 polymorphic sites were identified among cyt coding sequences. Thirteen haplotypes defined, haplotype was 0.4709 ranging 0.2577 0.6114. Thirty-five (C1-C35) classified 9 Asia 3 European breeds. C2 major that contained 206 (64.6%) all breeds used....

Abstract Negative energy wave (NEW) phenomena may appear in shear flows the presence of a decay mechanism and external supply. We study appearance negative surface waves plasma cylinder incompressible limit. The is surrounded by an axial magnetic field different density. Considering flow inside viscosity outside flux tube, we derive dispersion relations obtain analytical solutions for phase speed growth rate (increment) waves. It found that critical occurrence dissipative instability...

Mode conversion of p-polarized electromagnetic waves into longitudinal plasma oscillations at resonance points in cold, unmagnetized, and stratified plasmas, where a small periodic density modulation is superimposed on linear electron profile, theoretically studied. The mode coefficient the magnetic field distribution are calculated numerically exact manner using invariant imbedding theory conversion. It found that resonant enhancement conversion, which sometimes as high 100%, can be...

We study the effect of resonant absorption surface sausage and kink modes under photospheric conditions where slow undergo damping in continuum Alfv\'{e}n continua at transitional layers. use recently derived analytical formulas to obtain rate (time). By considering linear density pressure profiles for layers, we show that could be an efficient mechanism wave whilst mode is weak. It also found fast much stronger than mode, showing a similar efficiency as coronal conditions. worth notice body...

We study the effects of a random spatial variation plasma density on mode conversion electromagnetic waves into electrostatic oscillations in cold, unmagnetized, and stratified plasmas. Using invariant imbedding method, we calculate precisely field distribution coefficient, which is defined to be fraction incident wave power converted oscillations, for configuration where numerically generated added background linear profile. repeat similar calculations large number configurations take an...

Abstract We study properties of intensity disturbances along polar coronal rays that are associated with plumes below. For this, we draw azimuth–time images extreme ultraviolet (EUV) emission 171 Å band observed by the SDO/AIA and white light (WL) SOHO/LASCO C2 in 2020 July. From image, define two tracks which EUV intensities were recurrently enhanced during weeks. The rooted at 78.°8 81.°4 latitudes, but their projected azimuth angles changed time as Sun rotates. Coherent WL different...

Abstract Observations reveal that surface and body modes exist in solar pores under photospheric conditions. While the effects of resonant absorption on are well established, its effect is not known yet. In this paper, we investigate for We numerically solve dispersion relation induced by thin boundary approximation obtain wave curves damping rates three arbitrarily chosen sausage kink waves, respectively. The results show weaker than slow both cusp Alfvén continua. behavior similar to while...

We study theoretically the linear mode conversion between electromagnetic waves and Langmuir in warm, stratified, unmagnetized plasmas, using a numerically precise calculation based on invariant imbedding method. verify that principle of reciprocity for forward backward coefficients holds precisely regardless temperature. also find temperature dependence coefficient is substantially stronger than previously reported. Depending wave frequency incident angle, found to increase or decrease with

ABSTRACT We study theoretically the issue of externally driven excitations standing kink waves and their resonant absorption into torsionally polarized m = 1 in coronal loops pressureless plasmas. use ideal MHD equations, for which we develop an invariant imbedding method available cylindrical geometry. assume a sinusoidal density profile at loop boundary where inside is lower than outside vice versa. present field distributions these two cases find that they have similar behaviors. compare...

Slow magnetoacoustic waves in a static background provide seismological tool to probe the solar atmosphere analytic frame. By analyzing spatiotemporal variation of electron number density plume structure coronal holes above limb for given temperature, we find that perturbations accelerate with supersonic speeds distance range from 1.02 1.23 radii. We interpret them as slow propagating at about sound speed accelerating subsonic flows. The average sonic height flows is calculated be 1.27 mass...

The wave equation for linear shallow water waves propagating over a varying bottom topography has the same form as that p-polarized electromagnetic in inhomogeneous dielectric media. role played by permittivity case of is inverse depth. We apply invariant imbedding theory propagation, which been developed mainly to study special where depth depends on only one coordinate. By comparing numerical result obtained using our method, when profile linear, with an exact analytical formula, we...

We study theoretically the mode conversion and associated resonant absorption of p-polarized electromagnetic waves into longitudinal plasma oscillations in cold, unmagnetized stratified plasmas with periodic spatial density variations. consider sinusoidal configurations for which frequency band where occurs is well included within a transmission one-dimensional photonic crystal. calculate coefficient, measures fraction wave energy absorbed plasma, distribution magnetic field intensity...

Abstract Impulsively excited sausage oscillations of a plasma cylinder with smooth radial profile Alfvén speed are analyzed numerical solution the initial-value problem for partial differential equation Klein–Gordon type, describing linear magnetoacoustic fixed axial wavelength and an azimuthal mode number. The range ratios speeds outside inside is from 2 to 10. Both trapped leaky regimes considered. It shown that even in long-wavelength limit, i.e., wavenumbers much smaller than cutoff...

Mode conversion and resonant absorption are crucial mechanisms for wave transport absorption. Scaling behavior of mode or is well-known electromagnetic MHD waves in planar geometry. Our recent study showed that such a scaling could also exist coronal loop oscillations with cylindrical geometry, but it was only tested one density profile. Here we generalise our previous on the by considering multiple profiles. Applying an invariant imbedding method to ideal equations, show exists these...

Abstract The shear flow influences the stability of magnetohydrodynamic (MHD) waves. In presence a dissipation mechanism, may induce an MHD wave instability below threshold Kelvin–Helmholtz instability, which is called dissipative instability. This phenomenon also negative energy because it closely related to backward wave, has energy. Considering viscosity as we derive analytical dispersion relation for slow sausage modes in straight cylinder with discontinuous boundary. It assumed that...

The Alfv\'{e}n speed and plasma beta in photospheric bright points observed by the Broadband Filter Imager (BFI) of Solar Optical Telescope (SOT) on board \textit{Hinode} satellite, are estimated seismologically. diagnostics is based theory slow magnetoacoustic waves a non-isothermally stratified photosphere with uniform vertical magnetic field. We identify track G-band movie using 3D region growing method, align them blue continuum images to derive their brightness temperatures. From...

Abstract Resonant absorption is considered to be a crucial mechanism for the damping of coronal loop oscillations and plasma heating. We study resonant kink excited by such external drivers as flares, assuming that there an intermediate shear flow region surrounding loop. find long loops can highly enhanced or reduced depending sensitively on magnitude direction spatial extent when transitional layer thin. For short loops, high speed thick are needed have substantial absorption. provide...

In real space plasmas, there exist random spatial variations of the plasma density as well regular variations. The profile can affect behaviors resonance and wave propagation. this paper, we investigate how mode conversion from electromagnetic waves into electrostatic modes in a stratified unmagnetized is affected by superimposed to linear near resonance. We obtain surprising result that substantially enhanced presence weak randomness. interpret terms enhancement tunneling due

We investigate theoretically the interplay between resonant absorption due to mode conversion and excitation of extremely strong surface waves in a transition layer positive negative index media.

Surface plasma waves can be excited in inhomogeneous plasmas by p-polarized waves. We study the interplay between surface and mode conversion cold, unmagnetized plasmas, using invariant imbedding method. find that efficiency greatly enhanced due to an excitation of