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Transcript of Katharine K. Reeves 1, Terry G. Forbes 2, Jon Linker 3 & Zoran Mikić 3 1 Harvard-Smithsonian Center...
![Page 1: Katharine K. Reeves 1, Terry G. Forbes 2, Jon Linker 3 & Zoran Mikić 3 1 Harvard-Smithsonian Center for Astrophysics 2 University of New Hampshire 3 Science.](https://reader036.fdocuments.in/reader036/viewer/2022062809/5697bfb71a28abf838c9e944/html5/thumbnails/1.jpg)
Katharine K. Reeves1, Terry G. Forbes2, Jon Linker3 & Zoran Mikić3
1Harvard-Smithsonian Center for Astrophysics2University of New Hampshire3Science Applications International Corporation
Theoretical Predictions of Energy Release in
CMEs and Calculations of Flare Emissions
Thanks to the NSF-SHINE program for funding this work!
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OverviewMain Goal:
Energy dissipated in the current sheet
Flare emissions
Methods:1. Analytic: loss-of-equilibrium model2. Numerical: 2.5D MHD code (SAIC MAS)
Lin & Forbes, 2000
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Equilibrium Curve
Forbes & Priest, 1995
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Poynting Flux Thermalized
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Energy Release
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Effect of MA on Energy
Time (s)
En
erg
y (
x 1
031 e
rgs)
MA = 0.001
MA = 0.006
MA = 0.1
Reeves & Forbes, ApJ,
2005
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Soft X-ray Telescope (SXT) Light Curves
Observed
Simulated
Data from Reeves & Warren, ApJ, 2002Simulated light curves from Reeves & Forbes, ApJ 2005
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Velocities and Light Curves
Red curves
Blue curves
Background Field: 50 GFlux rope mass: 2.1 x 1016 gm
Background Field: 25 GFlux rope mass: 4.0 x 1015 gm
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Densities in the flare loops
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Density
Reeves, Warren & Forbes, ApJ, 2007
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Simulated Flare Images
TRACE 171Å TRACE 195Å
SXT Al12 SXT Be119Reeves, et
al., ApJ, 2007
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Loop-top knots and bars
(e.g. Feldman, et al., 1995)
Yohkoh SXT TRACE 171 TRACE 195(e.g. Doschek & Warren, 2005)
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SAIC MAS MHD model
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QuickTime™ and aTIFF (Uncompressed) decompressor
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Density
Temperature
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Energy over simulation domain
shearing
flux cancellation
current sheetforms
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Current sheet
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Energy partition
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Energy into current sheet
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Energy flow at r0
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Energy flow at r1
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Simulated light curves
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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XRT observations
QuickTime™ and aTIFF (Uncompressed) decompressor
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QuickTime™ and aTIFF (Uncompressed) decompressor
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Conclusions
• The loss-of-equilibrium model is capable of simulating flare emissions characteristic of observations
• In the SAIC simulations, a higher fraction of the energy leaves the current sheet at the r1 boundary than the r0 boundary.
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Conclusions• Conduction, viscous flow
decrease the energy swept in to the current sheet via the Poynting flux.
• The bulk of the energy flow at r0 is conductive flux, which can be used as the input to multi-threaded 1D flare loop simulations, as in Reeves et al. (2007).