Chris Lowder

Montana State University Solar Physics REU Program


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thursday july 19, 2007
Today there were a few ends still being tied up. The HSP magnetogram mass ambiguity resolution is almost completed, hopefully finished by friday morning. The hinode data is still messing up with the ambiguity resolution process. I'm still attempting to narrow down where this error is happening that is vastly changing the results in a totally wrong way. The paper is also coming along nicely, with a few figures revised today to make them more clear.




monday july 16, 2007
After leaving a hinode magnetogram to run in the ambiguity resolution code over the weekend, results finally came through. To simplify things, the magnetogram was cut for absolute values below 1000G. The tessellation variables were also modified such that the central region was isolated. The results don't show up well when the magnetogram is looked at as a whole, as there are far too many vectors. When looking at a subgram, the vectors can be distinguished by sight, however.








wednesday july 12, 2007
Continuing to process the HSP magnetograms using the tesscurrent program. With frequent crashing due to bad magnetograms the process is going slow, but going nonetheless.

In the meanwhile I've been working on preparing figures and a latex template for a paper presenting a comparison of the tessellation current3 program to the original. All of the figures are prepared, and are in .eps format. I've set up a template, and am working on filling it out.

This paper has been the focus of work while waiting for both the HSP data to reduce, as well as the time between runs with the Hinode data. I'm attempting to ambiguity resolve the hinode data using the tesscurrent program. It's running into snags along the way, and take several minutes to run each time. We're making some progress though!




friday july 6, 2007
Continued to run the batch processing of all 1043 active regions which data exists for. Running on all three servers, earth, wind, and fire, the job will still take around 5 days.

After recieving the hinode data thanks to Dr. Tom Metcalf, I've begun adapting the tesselation code to work with the full resolution of the hinode data. Cropping the region to just the active area helps to cut down on computing time. On an initial run, the tesselation code identified 1022 regions within the magnetogram.


Also worked with taking an example result from the batch processing and mapping out the ratio of b_trans to bz for each pixel. This map is then compared with the vector magnetogram.





wednesday july 4, 2007
Arrived at work to see that the batch file started last night died after a few iterations. Running it over the course of the day to see how far it'll get this time.

Because the process began repeating itself, it ran the tesscurrent program again on the same region. Using the two save files from the two different runs, I decided to compare the two to see if the program would create different results running on the same region. The two runs, save for one strange pixel, agree entirely.




tuesday july 3, 2007
For the past few days I've been working on cleaning up a bit of the code used in the combined tesselation/current program. All of the code has been consolidated, and doesn't rely on messy save files to transfer information from one code to another. It neatly processes a region given a region number and filename. I've also written a program that, given a list of region numbers, runs through and processes the available magnetograms with higher resolution. I ran through a couple of regions to determine the best average values of saddlethresh and zthresh to best split the regions. It appears that a value of 25 for saddlethresh and 200 for zthresh provides the best on average. While the results from some regions is a little less to be expected, these cases are few.

This evening I'm running a batch session on the initial list of active regions with the new tesselated code. For each region the program runs the modified tesselation program, outputting a .ps file of the results, along with a .sav file containing the results for further plotting.



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