Simulation of NGS Speckle Observations over a 1' field with a 5 meter Telescope
Here is a movie showing a 3x3 grid of stars spread over 1 arcminute, viewed
through a 5 meter aperture.
3x3 grid
In this simulation the atmosphere consisted of one layer at 35 km.
Pictured on the left side of the movie is a 3x3 grid of circular
apertures. These represent the wavefront phase seen through the 5
meter aperture in the direction of each of the sources. A height of
35 km was chosen because the projections of the 5 meter apertures up
towards the sources are sheared by 5 meters at this altitude.
Pictured on the right is a 3x3 grid of electric field amplitudes
formed by propagating the wavefronts from each source into the far
field.
The parameters for this simulation were:
5 meter aperture
1 micron radiation
r0 of .3 meters at 1 micron
2 cm pixel scale in the wavefront
2 cm pixel scale in the turbulence layer
time step of duration 20 milliseconds
2 seconds (100 20 ms frames) of simulation time
If you watch this movie carefully, you can see how the images are
being steered and stretched by long spatial wavelength variations in
the pupil plane phase.