scholarly journals NLTE solar flare models with stationary velocity fields

1998 ◽  
Vol 127 (3) ◽  
pp. 607-618 ◽  
Author(s):  
T. Nejezchleba
Keyword(s):  
Solar Flare ◽  
Velocity Fields ◽  
Stationary Velocity

Image registration using stationary velocity fields parameterized by norm-minimizing Wendland kernel

2015 ◽  
Author(s):  
Akshay Pai ◽  
Stefan Sommer ◽  
Lauge Sørensen ◽  
Sune Darkner ◽  
Jon Sporring ◽  
...  
Keyword(s):  
Image Registration ◽  
Velocity Fields ◽  
Stationary Velocity

scholarly journals Chromospheric models of a solar flare including velocity fields

2002 ◽  
Vol 387 (2) ◽  
pp. 678-686 ◽  
Author(s):  
A. Falchi ◽  
P. J. D. Mauas
Keyword(s):  
Solar Flare ◽  
Velocity Fields

Kernel Bundle Diffeomorphic Image Registration Using Stationary Velocity Fields and Wendland Basis Functions

2016 ◽  
Vol 35 (6) ◽  
pp. 1369-1380 ◽  
Author(s):  
Akshay Pai ◽  
Stefan Sommer ◽  
Lauge Sorensen ◽  
Sune Darkner ◽  
Jon Sporring ◽  
...  
Keyword(s):  
Image Registration ◽  
Velocity Fields ◽  
Basis Functions ◽  
Diffeomorphic Image Registration ◽  
Stationary Velocity

Symmetries in hydrodynamic turbulence and MHD dynamo theory

1996 ◽  
Vol 56 (3) ◽  
pp. 391-406 ◽  
Author(s):  
George Knorr
Keyword(s):  
Magnetic Fields ◽  
Magnetic Energy ◽  
Three Dimensional ◽  
Velocity Fields ◽  
Dynamo Theory ◽  
Hydrodynamic Turbulence ◽  
Mhd Dynamo ◽  
Ideal Mhd ◽  
Dynamo Effect ◽  
Stationary Velocity

The three-dimensional equations of ideal hydrodynamics and ideal MHD are expanded in eigenfunctions of the curl, and the resulting basic interactions of these nonlinear systems are analysed. As the equations are invariant under time and amplitude reversal, a criterion defining the arrow of time is introduced. A new parameter, the center of energy, serves to characterize a basic interaction. In the 3D Euler equations we find four different interactions and their mirror images, two of which can transport energy to smaller wavenumbers. This can lead to the appearance of structures in turbulent flow, and throws doubt on a derivation of Kolmogorov's law based on a cascading of energy to higher wavenumbers.In energy the corresponding two-dimensional equations, which are isomorphic to the guiding centre model in plasma physics, only one interaction exists, with a strong inverse cascade, which can lead to accumulation of energy in the spatially largest accessible modes. In MHD theory it is possible to separate magnetic from kinetic interactions. The former give again four basic interactions, two being regular and two being inverse cascades. One of these is quite strong, and can lead to the MHD dynamo effect. Kinetic energy can be transferred into magnetic energy. The dynamo effect is is accompanied by alignment of velocity and magnetic fields. We show that stationary velocity fields may lead to exponentially growing magnetic fields and we give an explicit criterion for this instability.

scholarly journals Non-LTE diagnostics of velocity fields during the gradual phase of a solar flare

2005 ◽  
Vol 430 (2) ◽  
pp. 679-689 ◽  
Author(s):  
A. Berlicki ◽  
P. Heinzel ◽  
B. Schmieder ◽  
P. Mein ◽  
N. Mein
Keyword(s):  
Solar Flare ◽  
Velocity Fields ◽  
Gradual Phase
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