Weekly Report 8Oct2010

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Pixon and Vis Fwdfit Images of the Albedo

New RHESSI Website Progress

A meeting was organized to discuss the current state of the new RHESSI Website and the future direction of the effort to move content to the new format. It was decided that we would continue creating the structure of the website while linking to external documents for the final content. Some of this content will be moved into the Content Management System, Typo3, which we are currently using if the documents are in a more or less permanent state. For documents that change frequently, especially if updates to the content is produced automatically, we will keep them outside the CMS, and continue simply linking to them. Cosmetic changes to the site were also discussed. I will proceed with the implementation of these.

I should bee finished with writing a simplified version of a guide to adding content to new state. Currently there is document available at the link below which gives details of editing content using typo3 along with screenshots: Editing the New RHESSI Site using Typo3

Testing Image Reconstruction Algorithms

I've started running tests of the Clean image algorithm using the simulated data agreed upon at the RHESSI Workshop. I've started with the first image, a line source as the test case. In the case of the line source the clean image, shown below as contours on the original data map, was obtained.

The original line source with with the contours of the Clean Image overlaid

This Clean image was obtained with a clean_beam_width_factor = 2.0.

The following profiles were obtained with this image:


The profiles of the fits for each detector compared to the original simulated data

As is clear from the above profiles, either the calibrations of the detectors is incorrect or the Clean Image and profiles are not correlated.

Using Richards routine to obtain the total C statistic yields a value of:

Total C Statistic = 6.37

While this value is not acceptable it is considerably smaller than the value I get from the C statistics using hsi_plot_image_profile. Going through Richard's script for calculating the C statistic, he does it in a different manner than the C statistic is calculated in the HESSI GUI. One of the methods is getting this very wrong but I'm not sure which at this point. It is something I plan to look into further.

Goals for next week

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