transformation of mhd waves in sunspots and simulation of hmi level1 data konstantin parchevsky,...
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Transformation of MHD Transformation of MHD waves in sunspots and waves in sunspots and simulation of HMI level1 simulation of HMI level1
datadata
Konstantin Parchevsky, Sebastien Couvidat,Richard Wachter, Alexander Kosovichev
Stanford University
LoHCo Workshop, Stanford University, February 08-09, 2011
TD for Lsource = 6 Mm
x, Mm
t, m
in
Vnorm
w'
-1.5 -1 -0.5 0 0.5 1 1.50
5
10
15
20
25
30
35
TD for Lsource = 12 Mm
x, Mm
t, m
inV
norm
-3 -2 -1 0 1 2 30
10
20
30
40
Simulated I+V, I-V profilesSimulated I+V, I-V profiles
-0.2 -0.1 0 0.1 0.2 0.30
0.2
0.4
0.6
0.8
1
, A
I/Ic
-0.2 -0.1 0 0.1 0.2 0.30
0.2
0.4
0.6
0.8
1
, A
I/Ic
-0.2 -0.1 0 0.1 0.2 0.30
0.2
0.4
0.6
0.8
1
, A
I/Ic
A
BC
ABC
100
100
100
100
100
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200200
300
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60060
0
700800
X, Mm
Y, M
m
-10 -5 0 5 10
-10
-5
0
5
10
-1000
-500
0
500
1000
Magnetic fieldMagnetic field
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300300
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X, Mm
Y, M
m
-10 -5 0 5 10
-10
-5
0
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100 100
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100100
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X, Mm
Y, M
m
-10 -5 0 5 10
-10
-5
0
5
10
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800lg = -2.2 HMI algorithm
-15 -10 -5 0 5 10 150
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X, Mm
Ma
gn
etic fie
ld, G
lg = -1.5HMI algorithm
Magnetic field strengthMagnetic field strengthvs. line shapevs. line shape
pixel A B C line C 786.09 28.11 17.18 B 787.77 27.84 17.29 A 828.53 29.40 18.26
Reconstructed wavefieldReconstructed wavefield
ABC
100
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200200
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700800
X, Mm
Y, M
m
-10 -5 0 5 10
-10
-5
0
5
10
-1000
-500
0
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400400 50
0
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700800
X, MmY
, Mm
-10 -5 0 5 10
-10
-5
0
5
10
-1000
-500
0
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100 100
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100100
100
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300300
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X, Mm
Y, M
m
-10 -5 0 5 10
-10
-5
0
5
10
-1000
-500
0
500
1000
lg = -2.2
H = 50 km
from theline
ConclusionConclusion MHD wave transformation can be seen in velocity MHD wave transformation can be seen in velocity
components parallel and perpendicular to the components parallel and perpendicular to the magnetic field lines. Transformation exists even in magnetic field lines. Transformation exists even in case when the source is initially located case when the source is initially located completely outside of the magnetic region.completely outside of the magnetic region.
We simulated artificial HMI level 1 data from a We simulated artificial HMI level 1 data from a given numerically simulated velocity field using 1D given numerically simulated velocity field using 1D LTE radiative transfer SPINOR code.LTE radiative transfer SPINOR code.
Magnetic and velocity fields, reconstructed from Magnetic and velocity fields, reconstructed from these artificial data, show good agreement with these artificial data, show good agreement with the model data taken from the height of about the model data taken from the height of about 280 km above 280 km above =1 level.=1 level.