coronal cooling and multithermal analysis of aia loops
DESCRIPTION
Coronal Cooling and Multithermal Analysis of AIA Loops. Joan Schmelz Sankaet Pathak, Runpal Dhaliwal, Mac Christian, Christine Fair University of Memphis. Multi-thermal vs. Isothermal. Over dense?. Yes. No. Impulsive heating. Isothermal OK (steady heating). t obs = t cool ?. - PowerPoint PPT PresentationTRANSCRIPT
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Coronal Cooling and Multithermal
Analysis of AIA Loops
Joan SchmelzSankaet Pathak, Runpal Dhaliwal, Mac
Christian, Christine Fair University of Memphis
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Over dense?
tobs = tcool?
Isothermal OK(steady heating)
Isothermal OK(dynamic)
No (tobs >> tcool)
Multi-strand
Consistency Back to the drawing board
Multi-thermal vs. Isothermal
No
Yes
No
Yes
Yes
Impulsiveheating
Multi-thermal?
J. A. KlimchukLoops III WorkshopJune 21, 2007
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CHIANTI 7.1Chianti IonEqAbundances:
Schmelz et al. (2012)
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Over dense?
tobs = tcool?
Isothermal OK(steady heating)
Isothermal OK(dynamic)
No (tobs >> tcool)
Multi-strand
Consistency Back to the drawing board
Multi-thermal vs. Isothermal
No
Yes
No
Yes
Yes
Impulsiveheating
Multi-thermal?
J. A. KlimchukLoops III WorkshopJune 21, 2007
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Over-dense Loops
• Lenz et al. 1999, ApJ, 517, L155• Aschwanden et al. 2000, ApJ, 541, 1059• Warren & Winebarger 2003, ApJ, 596, L113 • Winebarger et al. 2003, ApJ, 587, 439• Aschwanden et al. 2008, ApJ, 680, 1477
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AIA 171 Å Dec 2010
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Aschwanden et al. (2000)
T = 1.2 MK
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Aschwanden et al. (2000)
ne = 5.7e8 cm-3
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Over dense?
tobs = tcool?
Isothermal OK(steady heating)
Isothermal OK(dynamic)
No (tobs >> tcool)
Multi-strand
Consistency Back to the drawing board
Multi-thermal vs. Isothermal
No
Yes
No
Yes
Yes
Impulsiveheating
Multi-thermal?
J. A. KlimchukLoops III WorkshopJune 21, 2007
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Cooling Loops
• Winebarger et al. 2003, ApJ, 593, 1164• Winebarger & Warren 2005, ApJ, 626, 543• Ugarte-Urra et al. 2009, ApJ, 695, 642• Mulu-Moore et al. 2011, ApJ, 733, 59• Viall & Klimchuk 2011, ApJ, 738, 24• Viall & Klimchuk 2012, ApJ, 753, 35
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Winebarger et al. (2003)
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Light Curves
Observed Lifetime>1.20e4s
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Radi
ative
Los
s (er
g cm
^3 s^
-1)
Temperature (K)
Radiative Cooling Time ~1.67e3 s
Observed Loop Lifetime >1.20e4 s
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Over dense?
tobs = tcool?
Isothermal OK(steady heating)
Isothermal OK(dynamic)
No (tobs >> tcool)
Multi-strand
Consistency Back to the drawing board
Multi-thermal vs. Isothermal
No
Yes
No
Yes
Yes
Impulsiveheating
Multi-thermal?
J. A. KlimchukLoops III WorkshopJune 21, 2007
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Cross-Field Temperatures
• Schmelz et al. 2001, ApJ, 556, 896 • Martens et al. 2002, ApJ, 577, L115• Weber et al. 2005, ApJ, 635, L101• Schmelz & Martens 2006, ApJ, 636, L49• Schmelz et al. 2007, ApJ, 658, L119• Warren et al. 2008, ApJ, 686, L131
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I ∫ R (T) ne2 dl
Change path length to Temp:
ne2 dl = DEM(T) dT
DEM = differential emission measure, so
I ∫ R (T) DEM(T) dT
Multi-thermal Plasma: DEM
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Log
DEM
(cm
^-5
K^-1
)
Log T (K)
chi^2 = 17.5
DEM_manualJason Kimble
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Pre-
to-O
bs In
tens
ity
Filter
chi^2 = 17.5
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Log
DEM
(cm
^-5
K^-1
)
Log T (K)
chi^2 = 1.0
DEM_iterativeMark Weber
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Log
DEM
(cm
^-5
K^-1
)
Log T (K)
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Log
DEM
(cm
^-5
K^-1
)
Log T (K)
chi^2 = 1.0
DEM_iterativeMark Weber
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Pre-
to-O
bs In
tens
ity
Filter
chi^2 = 1.0
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Over dense?
tobs = tcool?
Isothermal OK(steady heating)
Isothermal OK(dynamic)
No (tobs >> tcool)
Multi-strand
Consistency Back to the drawing board
Multi-thermal vs. Isothermal
No
Yes
No
Yes
Yes
Impulsiveheating
Multi-thermal?
J. A. KlimchukLoops III WorkshopJune 21, 2007
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Energy release in the solar corona from spatially resolved magnetic braidsJ. W. Cirtain et al. Nature, 493, 501 (24 January 2013)
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Conclusions
• Observations are now making significant contributes to the coronal heating problem
• Coronal loops appear to be multi-thermal and multi-stranded
• Consistent picture of heating the coronal with nanoflares, but . . .
• There is by no means unanimous agreement