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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
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).
How Could Loops be of Constant Cross-
Section?
•Twist? (Klimchuk et al., 2000)
•Separators? (Plowman et al., 2009)
How Could Loops be of Constant Cross-
Section?
•Emission loops (eLoops) do not actually trace field lines (Peter & Bingert, 2012)
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?
How Could Loops be of Constant Cross-
Section?•Maybe eLoops do not trace out magnetic
fields? (Peter & Bingert, 2012)