1. Week 9 Presentation Brent Holmes

2. Yohkoh SXT I am using data from the Soft X- ray Telescope aboard Yohkoh

3. 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.

4. With better resolution, we can see more loops than were initially visible. SXTTRACE We believe there are more loops then seen even here that would be visible with even better resolution.

5. 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.

6. Light Curve 1992 September 6 Filter 2

7. 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.

8. 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.

9. Light Curve Stitching Before The align program wasn’t working properly.

10. Light Curve Stitching After So I made a program to let me repick the pixels to make the light curves after the jumps.

11. Single Filter Light Curve Stitching 1998 May 5 th Filter 5 (Before)

12. Single Filter Light Curve Stitching 1998 May 5 th (After)

13. Finding the Best Temperature, Density, and Number of Strands This is a picture of the running amoeba program

14. What is an amoeba?

15. The Amoeba’s Flow Chart (courtesy C.C. Kankelborg)

16. Amoeba Amoeba searches for the best fit line. In this early picture it is far off

17. Amoeba

21. Eventually it finds a pretty good fit.

22. Best fit results to flare of September 23, 1998

23. Comparison New to Old

24. Amoeba Loop number vs peak temperature

25. Comparison Ours to Single Strand Model

26. Best fit results to flare of December 27 th, 1999

27. Comparison New to Old

28. Comparison Ours to Single Strand Model

29. Hard X ray 1992 September 6th The contours are the hard x-rays, the colored parts are the soft x-rays

30. Hard X ray 1997 November 6th Hard X-rays concentrate around the loop tops and the foot points.

31. Hard X ray 1998 September 23 rd Notice the Hard X-rays above the flare top.

32. 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.

33. Forbes and Acton’s Flare

34. And of course I’ve been working on Presentations