Magnetic Dissipation in the Photosphere and Heating of the Corona
B z e m a n MT Heating and Dynamics of Two Flare Loop ...
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J u l y 2 0 1 3 AAS 44th SPD Meeting B o z e m a n M T 1/11 Heating and Dynamics of Two Flare Loop Heating and Dynamics of Two Flare Loop Systems Observed by AIA and EIS Systems Observed by AIA and EIS Ying Li 1,2 , Jiong Qiu 2 , Mingde Ding 1 1 Nanjing University 2 Montana State University July 9 2013
Transcript of B z e m a n MT Heating and Dynamics of Two Flare Loop ...
July 2013
AAS 44th SPD Meeting
Bozeman M
T
1/11
Heating and Dynamics of Two Flare Loop Heating and Dynamics of Two Flare Loop Systems Observed by AIA and EISSystems Observed by AIA and EIS
Ying Li1,2, Jiong Qiu2, Mingde Ding1
1Nanjing University2Montana State University
July 9 2013
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Contents
• Background
• Method
• Results
• Summary
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Background
Flare heating issue
Magnetic reconnection
Energy release
Plasma evolution
Flare radiation
Heating function (inferred from UV light curve)
Simulation(via EBTEL model)
(observable)
(observable)
???
???
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Methodthe zero-dimensional “Enthalpy-Based Thermal Evolution of Loops” model (EBTEL; Klimchuk et al. 2008, Cargill et al. 2012)
EBTEL modelinginputsL & Q(t)=H(t)/L =λI(t)/L
outputsn, P, T, v(enthalpy flow)
(loop length, UV light curve)
ObservationsSynthetic EUV
radiation & velocitycomparison(EUV light curve, velocity)
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identify two flare loop systemstreated as 49 individual loops
each footpoint area: 4'' by 4'' AIA pixel size: 0.6'' by 0.6''
a C4.7 flareon 2011 Feb. 13in AR 11158
AIA imaging dataEIS spectroscopic data
Observations
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Observations
long-lasting blueshifts & twice-brightenings→ continuous heating
Doppler velocity & UV light curve at footpoint patches
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Modeling
Heating function
DEM evolution
half-gaussian fitting directly proportional to the UV light curve
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Comparisonwith AIA flux
synthetic VS observed EUV fluxes
basically consistent
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Comparisonwith EIS intensity
synthetic VS observed EUV intensities
basically consistent
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Comparisonwith EIS velocity
synthetic VS observed EUV velocities
agree well not fully reproduce
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Summary
The two loop systems show quite different heating and dynamics (2nd loop system: continuous heating and long-lasting blueshifts).
The comparisons between model and observations are different in these two loop systems. (may exist different heating mechanisms)
The prominent discrepancies between model and observations in the 2nd loop system may be caused by: (1) non-uniform heating; (2) exist unresolved fine flare strands.
0D EBTEL model: although with simplified assumptions, fast speed & few parametersbe valid to constrain the flare heating model & provide reference for 1D models.
Spectroscopic diagnostics: determine the free parameters in the model; examine the assumptions made in the model.
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