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Cross-Sectional Properties of Coronal Loops and Their Implications

Cross-Sectional Properties of Coronal Loops and Their Implications. Henry “ Trae ” Winter III with Chester Curme. Constant Cross-Section?. Klimchuk et al. 1992 Studied 10 SXT loops Measured an Apex to Footpoint Expansion Factor of. TRACE Loops. Watko & Klimchuk, 2000 22 Loops

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Cross-Sectional Properties of Coronal Loops and Their Implications

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  1. Cross-Sectional Properties of Coronal Loops and Their Implications • Henry “Trae” Winter III • with • Chester Curme

  2. Constant Cross-Section? • Klimchuk et al. 1992 • Studied 10 SXT loops • Measured an Apex to Footpoint Expansion Factor of

  3. TRACE Loops • Watko & Klimchuk, 2000 22 Loops • Lopéz Fuentes et al, 2006 20 Loops

  4. DeForest, 2007

  5. DeForest, 2007

  6. Unresolved Structures

  7. Lopés Fuentes et al, 2008 • Countered DeForest’s argument • Claimed that their method could distinguish between unresolved expanding and not expanding but resolved strands • Conversation switched to theories that predict constant cross-section loops (i.e. Constant B).

  8. How Could Loops be of Constant Cross-Section? • Twist? (Klimchuk et al., 2000) • Separators? (Plowman et al., 2009)

  9. How Could Loops be of Constant Cross-Section? • Emission loops (eLoops) do not actually trace field lines (Peter & Bingert, 2012)

  10. Apex Temperature Evolution

  11. Apex Density Evolution

  12. Over Pressure

  13. Synthetic Obs.171 AIA Pixel Size Hi-C Pixel Size 1.0 1.1 1.2 1.3 1.4 1.5 2.0 3.0 4.0 5.0

  14. Synthetic Obs.335 AIA Pixel Size Hi-C Pixel Size 1.0 1.1 1.2 1.3 1.4 1.5 2.0 3.0 4.0 5.0

  15. Width Measurements z

  16. Estimation of WidthAIA171

  17. Estimation of WidthAIA 335

  18. Estimation of Width“Hi-C Like”171 z

  19. Estimation of Width“Hi-C Like” 335

  20. Summary • Loop geometry has an effect on fundamental loop properties such as temperature and density (pressure) • Vesecky, Antiochos, and Underwood, 1979; Mariska, 1984; Schrijver, Lemen and Mewe, 1989; Dowdy, Emslie, and Moore, 1987 • Modeled near-resolution, expanding loops can appear to be of constant cross-section just like those “pesky” observations • Loops must be many pixels wide to make width determinations • Is it safe to use magnetic fields to generate loop geometries for 1D models?

  21. Extra Slides

  22. See Anna Malanushenko’s Work at the SPD

  23. See Anna Malanushenko’s Work at the SPD

  24. How Could Loops be of Constant Cross-Section? • Twist? (Klimchuk et al., 2000)

  25. How Could Loops be of Constant Cross-Section? • Separators? (Plowman et al., 2009)

  26. How Could Loops be of Constant Cross-Section? • Maybe eLoops do not trace out magnetic fields? (Peter & Bingert, 2012)

  27. How Could Loops be of Constant Cross-Section? Peter & Bingert, 2012

  28. What happens if loops are not of constant cross-section?

  29. Brooks, et al 2013

  30. Brooks, et al 2013

  31. Brooks, et al 2013

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