Spatial evolution of the morphology of an optical vortex dipole

2004 ◽  
Vol 236 (4-6) ◽  
pp. 433-440 ◽  
Author(s):  
Filippus S. Roux
Keyword(s):  
Optical Vortex ◽  
Spatial Evolution ◽  
Vortex Dipole

scholarly journals Evolution of an optical vortex dipole diffracted by a half screen

2011 ◽  
Vol 60 (7) ◽  
pp. 074209
Author(s):  
Gao Zeng-Hui ◽  
He De ◽  
Lyu Bai-Da
Keyword(s):  
Optical Vortex ◽  
Vortex Dipole

Generation of optical vortex dipole from superposition of two transversely scaled Gaussian beams

2016 ◽  
Vol 55 (12) ◽  
pp. B91 ◽  
Author(s):  
Dinesh N. Naik ◽  
T. Pradeep Chakravarthy ◽  
Nirmal K. Viswanathan
Keyword(s):  
Optical Vortex ◽  
Gaussian Beams ◽  
Vortex Dipole

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

LABORATORY STUDIES OF THE OF EDDY FORMATION IN ROTATING AND NON-ROTATING FLUID DUE TO SPATIALLY NON-UNIFORM WIND FORCING

2017 ◽  
Author(s):  
Dmitry Elkin ◽  
Dmitry Elkin ◽  
Andrey Zatsepin ◽  
Andrey Zatsepin
Keyword(s):  
Water Area ◽  
The Black Sea ◽  
Rotating Fluid ◽  
Rotating Platform ◽  
Cyclonic Vorticity ◽  
Dipole Structure ◽  
Air Jet ◽  
Vortex Dipole ◽  
Eddy Formation ◽  
Observation Results

Laboratory investigation of eddy formation mechanism due to spatially non-uniform wind impact was fulfilled. Experiment was provided in a cylindrical and a square form tank filled with homogeneous or stratified fluid and displaced on a rotating platform. In the absence of the platform rotation, an impact of the single air jet lead to the formation of a symmetric vortex dipole structure that occupied the whole water area in the tank. In the presence of the platform rotation, a compact anticyclonic eddy was formed in a part of the dipole with anticyclonic vorticity, while in a part with cyclonic vorticity no any compact eddy was observed. The laboratory results were successfully compared with the field observation results fulfilled in the at the Black Sea coastal zone near Gelendzhik.

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