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
100
200
200
200200
300
300
300
400
400
400
500
500
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
100
100
100
100
100
100
200
200
200
200
300
300300
400
400
400
500
500
600
600 700
800
X, Mm
Y, M
m
-10 -5 0 5 10
-10
-5
0
5
10
100
200
300
400
500
600
700
800
100 100
100
100100
100
200
200
200
200
300
300
300
400
400400 50
0
500
600
600
700
800
X, Mm
Y, M
m
-10 -5 0 5 10
-10
-5
0
5
10
100
200
300
400
500
600
700
800lg = -2.2 HMI algorithm
-15 -10 -5 0 5 10 150
200
400
600
800
1000
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
100
100
100
100
100
200
200
200200
300
300
300
400
400
400
500
500
600
600
700800
X, Mm
Y, M
m
-10 -5 0 5 10
-10
-5
0
5
10
-1000
-500
0
500
1000
100
100
100
100
100
100
200
200
200
200
300
300
300
400
400400 50
0
500
600
600
700800
X, MmY
, Mm
-10 -5 0 5 10
-10
-5
0
5
10
-1000
-500
0
500
1000
100 100
100
100100
100
200
200
200
200
300
300300
400
400
400
500
500
600
600 700
800
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.