cross-sectional properties of coronal loops and their implications
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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. TRACE Loops. Watko & Klimchuk, 2000 22 Loops - PowerPoint PPT PresentationTRANSCRIPT
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Cross-Sectional Properties of
Coronal Loops and Their Implications
Henry “Trae” Winter III with
Chester Curme
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Constant Cross-Section?
•Klimchuk et al. 1992
•Studied 10 SXT loops
•Measured an Apex to Footpoint Expansion Factor of
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TRACE Loops
•Watko & Klimchuk, 2000 22 Loops
•Lopéz Fuentes et al, 2006 20 Loops
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DeForest, 2007
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DeForest, 2007
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Unresolved Structures
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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).
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How Could Loops be of Constant Cross-
Section?
•Twist? (Klimchuk et al., 2000)
•Separators? (Plowman et al., 2009)
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How Could Loops be of Constant Cross-
Section?
•Emission loops (eLoops) do not actually trace field lines (Peter & Bingert, 2012)
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Apex Temperature Evolution
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Apex Density Evolution
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Over Pressure
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Synthetic Obs.171
1.0 1.31.21.1 2.01.51.4 4.03.0 5.0
AIA Pixel Size
Hi-CPixel Size
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Synthetic Obs.335
1.0 1.31.21.1 2.01.51.4 4.03.0 5.0
AIA Pixel Size
Hi-CPixel Size
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zzzz
Width Measurements
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Estimation of Width
AIA171
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Estimation of Width
AIA 335
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zzzz
Estimation of Width
“Hi-C Like”171
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Estimation of Width
“Hi-C Like” 335
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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?
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Extra Slides
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See Anna Malanushenko’s Work at the SPD
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See Anna Malanushenko’s Work
at the SPD
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How Could Loops be of Constant Cross-
Section?•Twist? (Klimchuk et al., 2000)
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How Could Loops be of Constant Cross-
Section?•Separators? (Plowman et al., 2009)
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How Could Loops be of Constant Cross-
Section?•Maybe eLoops do not trace out magnetic
fields? (Peter & Bingert, 2012)
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How Could Loops be of Constant Cross-
Section?
Peter &Bingert, 2012
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What happens if loops are not of constant cross-
section?
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Brooks, et al 2013
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Brooks, et al 2013
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Brooks, et al 2013