Week 9 Presentation Brent Holmes. Yohkoh SXT I am using data from the Soft X- ray Telescope aboard...
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Transcript of Week 9 Presentation Brent Holmes. Yohkoh SXT I am using data from the Soft X- ray Telescope aboard...
![Page 1: Week 9 Presentation Brent Holmes. Yohkoh SXT I am using data from the Soft X- ray Telescope aboard Yohkoh.](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649d2d5503460f94a0361b/html5/thumbnails/1.jpg)
Week 9 Presentation
Brent Holmes
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Yohkoh SXT
• I am using data from the Soft X-ray Telescope aboard Yohkoh
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Searching for a better model for the cooling of solar flares
• Current theories cannot model the cooling very well. We will be working to better fit the tails of these light curves by varying parameters including number of loops.
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With better resolution, we can see more loops than were initially visible.
• SXT TRACE• We believe there are more loops then seen even here that would be
visible with even better resolution.
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A saturated frame and a normal frame
• When I had retrieved the data from Yohkoh for our project, I had to remove saturated frames like the one below. I also had to remove frames not focused on the flare, scattered light and vignetting.
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Light Curve 1992 September 6 Filter 2
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Loop Length vs Time 1992 September 6
• With this best fit line we are able to give input of loop length change to our program.
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How much do the footpoints move?• The x’s
mark the position at 5:14:32.
• The o’s mark the position at 5:24:02.
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Light Curve Stitching Before
• The align program wasn’t working properly.
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Light Curve Stitching After
• So I made a program to let me repick the pixels to make the light curves after the jumps.
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Single Filter Light Curve Stitching1998 May 5th Filter 5 (Before)
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Single Filter Light Curve Stitching1998 May 5th (After)
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Finding the Best Temperature, Density, and Number of Strands
• This is a picture of the running amoeba program
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What is an amoeba?
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The Amoeba’s Flow Chart (courtesy C.C. Kankelborg)
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Amoeba• Amoeba searches for the best fit line. In this
early picture it is far off
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Amoeba
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Amoeba
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Amoeba
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Amoeba
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Amoeba• Eventually it finds a pretty good fit.
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Best fit results to flare of September 23, 1998
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Comparison New to Old
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AmoebaLoop number vs peak temperature
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Comparison Ours to Single Strand Model
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Best fit results to flare of December 27th, 1999
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Comparison New to Old
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Comparison Ours to Single Strand Model
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Hard X ray 1992 September 6th• The contours are the hard x-rays, the colored
parts are the soft x-rays
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Hard X ray 1997 November 6th• Hard X-rays concentrate around the loop tops and
the foot points.
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Hard X ray 1998 September 23rd
• Notice the Hard X-rays above the flare top.
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Loop Top change• The change in
a loop before and after reconnection can be measured by taking the height difference between the inner loop and the outer loop when their foot points are at the same place.
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Forbes and Acton’s Flare
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And of course I’ve been working on Presentations