Spatial Damping of Kink MHD Waves in the Presence of Magnetic Twist and Plasma Flow

2018 ◽  
Vol 864 (1) ◽  
pp. 2 ◽  
Author(s):  
Karam Bahari
Keyword(s):  
Plasma Flow ◽  
Mhd Waves ◽  
Spatial Damping

Role of equilibrium plasma flow on damping of slow MHD waves

2011 ◽  
Vol 85 (12) ◽  
pp. 1879-1886 ◽  
Author(s):  
N. Kumar ◽  
P. Kumar ◽  
A. Kumar ◽  
R. Chauhan
Keyword(s):  
Plasma Flow ◽  
Mhd Waves ◽  
Equilibrium Plasma

scholarly journals Low-frequency oscillations while magnetic storms as a tool to determine the types of solar plasma flows

2020 ◽  
Vol 220 ◽  
pp. 01090
Author(s):  
N. A. Barkhatov ◽  
S.E. Revunov ◽  
O. T. Cherney ◽  
Zh. V. Smirnova ◽  
M. V. Mukhina
Keyword(s):  
Solar Wind ◽  
Plasma Flow ◽  
Geomagnetic Field ◽  
Interplanetary Space ◽  
Solar Wind Speed ◽  
Solar Wind Plasma ◽  
Mhd Waves ◽  
Plasma Flows ◽  
Solar Plasma ◽  
Flow Parameters

Comparison of wavelet spectrum (skeletons) local maxima for disturbed components of solar plasma flow parameters and geomagnetic field disturbances recorded along the meridional station chain during geomagnetic storm intervals is performed in the range of magnetohydrodynamic (MHD) waves. An algorithm for quantitative evaluation of analyzed skeletons consistency has been developed. It has been used to demonstrate the possibility of the type of solar wind plasma flow elaboration on unique spectral signs of Solar wind speed disturbances, density and interplanetary magnetic field. It is shown that the energy spectrum of oscillations for these parameters reflects the internal structure of the corresponding plasma formation. The skeletons application to the analysis of the interplanetary space main parameters made it possible to estimate the magnetosphere reaction time in geomagnetic field horizontal component oscillations at different latitudes on the disturbance. As a result, the distributed magnetosphere reaction over latitude was determined in the form of geomagnetic field oscillations on the disturbed solar flow parameters. It is shown that the dynamics of the components of the solar wind parameters disturbance spectra corresponding to plasma flows manifest themselves in the MHD spectra of high-latitude stations magnetograms and can be used as a diagnostic tool.

scholarly journals Classification of Solar Plasma Flows by Analyzing Out- and Intra-Magnetospheric Magnetohydrodynamic Oscillations During Magnetic Storms

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1078
Author(s):  
N. A. Barkhatov ◽  
S. E. Revunov ◽  
O. M. Barkhatova ◽  
E. A. Revunova ◽  
D. S. Dolgova ◽  
...  
Keyword(s):  
Solar Wind ◽  
Plasma Flow ◽  
Geomagnetic Field ◽  
Interplanetary Space ◽  
Solar Wind Speed ◽  
Solar Wind Plasma ◽  
Mhd Waves ◽  
Plasma Flows ◽  
Solar Plasma ◽  
Flow Parameters

Comparison of wavelet spectrum (skeletons) local maxima for disturbed components of solar plasma flow parameters and geomagnetic field disturbances recorded along the meridional station chain during geomagnetic storm intervals is performed in the range of magnetohydrodynamic (MHD) waves. An algorithm for quantitative evaluation of analyzed skeletons consistency has been developed. It has been used to demonstrate the possibility of the type of solar wind plasma flow elaboration on unique spectral signs of Solar wind speed disturbances, density and interplanetary magnetic field. It is shown that the energy spectrum of oscillations for these parameters reflects the internal structure of the corresponding plasma formation. The skeletons application to the analysis of the interplanetary space main parameters made it possible to estimate the magnetosphere reaction time in geomagnetic field horizontal component oscillations at different latitudes on the disturbance. As a result, the distributed magnetosphere reaction over latitude was determined in the form of geomagnetic field oscillations on the disturbed solar flow parameters. It is shown that the dynamics of the components of the solar wind parameters disturbance spectra corresponding to plasma flows manifest themselves in the MHD spectra of high-latitude stations magnetograms and can be used as a diagnostic tool.  

scholarly journals Compressional waves in the Earth's neutral sheet

2004 ◽  
Vol 22 (1) ◽  
pp. 303-315 ◽  
Author(s):  
M. Volwerk ◽  
W. Baumjohann ◽  
K. H. Glassmeier ◽  
R. Nakamura ◽  
T. L. Zhang ◽  
...  
Keyword(s):  
Current Sheet ◽  
Power Density ◽  
Plasma Flow ◽  
High Speed ◽  
Rest Frame ◽  
Spectral Power ◽  
Spectral Power Density ◽  
Mhd Waves ◽  
Plasma Flows ◽  
Compressional Waves

Abstract. Compressional waves in the Earth's current sheet, driven by the high-speed plasma flows connected to substorms, are investigated using the Cluster magnetometer and plasma instrument. During the time that Cluster had its apogee in the magnetotail (July through October 2001), we have studied 5 events in detail. We find compressional waves in the 30–60mHz band, at a spectral power density that is dependent on when and where the event is observed. There is a difference of two orders of magnitude in power density between waves at substorm onset and waves during quiet times. Strong plasma flows are the driver of the wave power. The spacecraft location in the current sheet is also important for the spectral power density. Having four spacecraft available we can discern spatial from temporal variations. We have determined the propagation direction of the waves in the 30–60mHz band and found that in the Cluster rest frame they propagate in the same direction as the plasma flow at an angle 30° < ∆φ < 40° with respect to the plasma flow direction in the spacecraft' rest frame. Key words. Magnetospheric physics (magnetotail; MHD waves and instabilities; plasma sheet)

scholarly journals Spatial damping of compressional MHD waves in prominences

2007 ◽  
Vol 473 (3) ◽  
pp. 931-936 ◽  
Author(s):  
K. A. P. Singh ◽  
B. N. Dwivedi ◽  
S. S. Hasan
Keyword(s):  
Mhd Waves ◽  
Spatial Damping

Linear Visco-Resistive Computations of Magnetohydrodynamic Waves: I. The Code and Test Cases

1994 ◽  
Vol 144 ◽  
pp. 503-505
Author(s):  
R. Erdélyi ◽  
M. Goossens ◽  
S. Poedts
Keyword(s):  
Resonant Absorption ◽  
Numerical Code ◽  
Mhd Waves ◽  
Test Cases ◽  
Numerical Accuracy ◽  
Element Discretization ◽  
Flux Tubes ◽  
Magnetohydrodynamic Waves ◽  
Viscosity Coefficients ◽  
Magnetic Flux Tubes

AbstractThe stationary state of resonant absorption of linear, MHD waves in cylindrical magnetic flux tubes is studied in viscous, compressible MHD with a numerical code using finite element discretization. The full viscosity tensor with the five viscosity coefficients as given by Braginskii is included in the analysis. Our computations reproduce the absorption rates obtained by Lou in scalar viscous MHD and Goossens and Poedts in resistive MHD, which guarantee the numerical accuracy of the tensorial viscous MHD code.

OPTIMISATION OF THE CHARACTERISTICS OF THE PLASMA FLOW FROM A DIELECTRIC CHAMBER

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-349-C7-350
Author(s):  
I. I. Egorov ◽  
L. N. Lesnevsky ◽  
G. A. Popov ◽  
A. G. Sobol ◽  
V. N. Turin
Keyword(s):  
Plasma Flow

Clinical Renal Function Testing by External Double Isotope Monitoring Technique

1971 ◽  
Vol 10 (01) ◽  
pp. 16-24
Author(s):  
J. Fog Pedersen ◽  
M. Fog Pedersen ◽  
Paul Madsen
Keyword(s):  
Renal Function ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Plasma Flow ◽  
Filtration Rate ◽  
Renal Plasma Flow ◽  
Correlation Coefficients ◽  
Feedback System ◽  
Effective Renal Plasma Flow ◽  
Advantages And Disadvantages

SummaryAn accurate catheter-free technique for clinical determination simultaneouslyof glomerular filtration rate and effective renal plasma flow by means of radioisotopes has been developed. The renal function is estimated by the amount of radioisotopes necessary to maintain a constant concentration in the patient’s blood. The infusion pumps are steered by a feedback system, the pumps being automatically turned on when the radiation measured over the patient’s head falls below a certain preset level and turned off when this level is again readied. 131I-iodopyracet was used for the estimation of effective renal plasma flow and125I-iothalamate estimation of the glomerular filtration rate. These clearances were compared to the conventional bladder clearances and good correlation was found between these two clearance methods (correlation coefficients 0.97 and.90 respectively). The advantages and disadvantages of this new clearance technique are discussed.

RENAL FUNCTION AND KIDNEY SIZE FOLLOWING HYPOPHYSECTOMY IN MAN

1965 ◽  
Vol 48 (3) ◽  
pp. 348-354 ◽  
Author(s):  
Thomas Falkheden ◽  
Ingmar Wickbom
Keyword(s):  
Renal Function ◽  
Diabetic Retinopathy ◽  
Glomerular Filtration Rate ◽  
Plasma Flow ◽  
Mammary Carcinoma ◽  
Filtration Rate ◽  
Renal Plasma Flow ◽  
Kidney Weight ◽  
Kidney Size ◽  
Before And After

ABSTRACT Measurements of glomerular filtration rate (GFR) and renal plasma flow (RPF) were performed in close connection with roentgenographic estimation of kidney size, before and after hypophysectomy, in 10 patients (four cases of metastatic mammary carcinoma, five cases of diabetic retinopathy and one case of acromegaly). Hypophysectomy was regularly followed by a decrease in GFR and RPF. In most cases, a reduction in the roentgenographic kidney size was also observed. However, the changes in the roentgenographic kidney size and calculated kidney weight after hypophysectomy were smaller and occurred at a slower rate than the alterations in GFR and RPF. The results favour the view that, primarily, the decrease in GFR and RPF following hypophysectomy is essentially functional rather than due to a reduced kidney mass.

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