Weekly Report 25Mar2011

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RHESSI Albedo Imaging Test

The RHESSI Albedo Imaging test continued.

The following steps were attempted with Pixon an Clean:

The map below was the original map used to create the calibrated eventlist files. The two sources are normalized to the same value. The counts in each source are equal.

Orig map two sources.jpg


The table below shows the detector combinations, the imaging algorithms, and the results for the centroid and standard deviations in each case. The locations and standard deviations are in arcseconds.

Original Map ConfigurationImaging AlgorithmDetectors UsedImage Centroid XImage Centroid YST DEV XST DEV Y
Two Circular Gaussian Sources (offset by 6 arcsec)Pixon1 to 9907.47256.349.649.64
Two Circular Gaussian Sources (offset by 6 arcsec)Pixon4 to 9907.21256.189.389.56
Two Circular Gaussian Sources (offset by 6 arcsec)Pixon1 to 4910.37255.262.272.12
Two Circular Gaussian Sources (offset by 6 arcsec)Clean1 to 9907.59256.188.989.02
Two Circular Gaussian Sources (offset by 6 arcsec)Clean1 to 4910.87255.925.975.82
Two Circular Gaussian Sources (offset by 6 arcsec)Clean4 to 9907.83256.219.759.83

The centroids for both the Pixon and Clean images were in the same approximate locations. The centroids and standard deviations were all calculated using the flux tool. A circle of radius 30 arcsecs was placed around the image.

The plot below shows the flux profile in the Heliocentric X direction for the Clean images through the location of the centroid. The images were made from the map shown above.

The plot shows the flux profiles of images made with Clean from a map with two offset Gaussian sources, one with a standard deviation of two arcsecs and one with a standard deviation of 10 arcsec. The seperation of the two sources is 4 arcsecs. The plots were made from images using detectors 1 to 9, detectors 1 to 4, and detectors 4 to 9.


The plot below shows the flux profile in the Heliocentric X direction for the Pixon images through the location of the centroid. The images were made from the map shown above.


The plot shows the flux profiles of images made with Pixon from a map with two offset Gaussian sources, one with a standard deviation of two arcsecs and one with a standard deviation of 10 arcsec. The seperation of the two sources is 4 arcsecs. The plots were made from images using detectors 1 to 9, detectors 1 to 4, and detectors 4 to 9.

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