HESSI PSF in Polar Coordinates

This figure shows the HESSI point spread function for 9 subcollimators as computed in polar coordinates (using polar_psf.pro) and then projected onto the x-y plane. The upper left hand corner is at Sun center, and the outermost radius is 1000´´ from Sun center. The original pixel sizes of the polar PSF were 1´´ in radius and 0.35° (6.1 milli radians) in azimuth. The point source was taken to be at r=600´´, AZ = -45°. At this distance from Sun center, the azimuthal size of the PSF pixels is 3.7´´, about the resolution of the 2nd finest subcollimator, but not really adequate for the finest subcollimator, whose spatial resolution is 2.2´´.

The advantages of using polar coordinates for the PSF are that

December 2 Version of POLAR_PSF.PRO


Edward J. Schmahl
Last modified: Thu Dec 2 12:32:31 EST 1999