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

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Presentation transcript:

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

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

TRACE Loops Watko & Klimchuk, Loops Lopéz Fuentes et al, Loops

DeForest, 2007

Unresolved Structures

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)

Apex Temperature Evolution

Apex Density Evolution

Over Pressure

Synthetic Obs AIA Pixel Size Hi-C Pixel Size

Synthetic Obs AIA Pixel Size Hi-C Pixel Size

zz Width Measurements

Estimation of Width AIA171

Estimation of Width AIA 335

zz Estimation of Width “Hi-C Like”171

Estimation of Width “Hi-C Like” 335

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?

Extra Slides

See Anna Malanushenko’s Work at the SPD

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

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

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

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

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

Brooks, et al 2013