Kathy Reeves

Using CAVMORPH and
FORWARD to predict X-Ray
emission of hot cavity cores
Kathy Reeves, Harvard-Smithsonian Center
for Astrophysics
...with thanks to the ISSI Cavities Team
Friday, March 1, 13
Hinode XRT
Friday, March 1, 13
Summer 2008 cavity
Friday, March 1, 13
XRT cavity observing
program
Three filters - Al-poly (coolest), Ti-poly (middle)
and Thin Be (hottest)
768”x768” field of view
2x2 binning (~2” pixels)
Long exposure times (12 - 65 sec)
Lossless compression
Friday, March 1, 13
XRT data
TI-POLY FILTER
(COOLER)
Friday, March 1, 13
THIN-BE FILTER
(HOTTER)
Cavity structure
XRT thin Be, 20080719_1500, summed 1 hour
6.25
Friday, March 1, 13
Cavity structure
CHEWY NOUGAT
XRT thin Be, 20080719_1500, summed 1 hour
6.25
Friday, March 1, 13
Cavity structure
CHEWY NOUGAT
(HOT, BIGHT FILAMENT
CAVITY CORE - SEE
HUDSON ET AL. 1999)
XRT thin Be, 20080719_1500, summed 1 hour
6.25
Friday, March 1, 13
Friday, March 1, 13
XRT X-ray filters
Friday, March 1, 13
Temperature ratios
0.8
Be/Ti poly
Be/Al poly
Ratio
0.6
0.4
0.2
0.0
5.5
Friday, March 1, 13
6.0
6.5
7.0
Log T
7.5
8.0
Temperature movie
Friday, March 1, 13
2.0
Temp (MK)
1.8
4.0
Temp (Be/Ti−poly)
Temp (Be/Al−poly)
3.5
3.0
EM (x 1043 cm−3)
19−Jul−2008 15:00
1.6
2.5
1.4
2.0
1.2
1.0
1.5
EM (Be/Ti−poly)
EM (Be/Al−poly)
1.0
0.8
0.5
0
100
200
300
400
500
Clockwise distance along arc (arcsec)
42.0 42.5 43.0 43.5 44.0 44.5
−3)
Log EM (cm
21−Jul−2008
21:00
0.8 1.0 1.2 1.4 1.6 1.8
Temp (MK)
2.0
1.8
4
Temp (Be/Ti−poly)
Temp (Be/Al−poly)
EM (x 1043 cm−3)
Temp (MK)
3
1.6
1.4
2
1.2
1
1.0
EM (Be/Ti−poly)
EM (Be/Al−poly)
0.8
0
0
100
200
300
400
500
Clockwise distance along arc (arcsec)
42.0 42.5 43.0 43.5 44.0 44.5
−3)
Log EM (cm
23−Jul−2008
12:00
0.8 1.0 1.2 1.4 1.6 1.8
Temp (MK)
2.0
1.8
4
Temp (Be/Ti−poly)
Temp (Be/Al−poly)
EM (x 1043 cm−3)
Temp (MK)
3
1.6
1.4
2
1.2
1
1.0
EM (Be/Ti−poly)
EM (Be/Al−poly)
0.8
0
0
100
200
300
400
500
Clockwise distance along arc (arcsec)
42.0 42.5 43.0 43.5 44.0 44.5
Log EM (cm−3)
Friday, March 1, 13
0.8 1.0 1.2 1.4 1.6 1.8
Temp (MK)
CAVMORPH model
Friday, March 1, 13
Model parameters
Friday, March 1, 13
Model parameters
Friday, March 1, 13
And now use FORWARD...
Friday, March 1, 13
2.0
Temp (MK)
1.8
4.0
Model temp
Model EM
3.5
3.0
EM (x 1043 cm−3)
Sim 19−jul−2008 15:00
1.6
2.5
1.4
2.0
1.2
1.0
1.5
Data temp
Data EM
1.0
0.8
0.5
0
100
200
300
400
500
Clockwise distance along arc (arcsec)
42.0 42.5 43.0 43.5 44.0 44.5
−3)
Log EM
(cm
Sim
21−jul−2008
15:35
0.8 1.0 1.2 1.4 1.6 1.8
Temp (MK)
2.0
1.8
4
Model temp
Model EM
EM (x 1043 cm−3)
Temp (MK)
3
1.6
1.4
2
1.2
1
1.0
Data temp
Data EM
0.8
0
0
100
200
300
400
500
Clockwise distance along arc (arcsec)
42.0 42.5 43.0 43.5 44.0 44.5
−3)
Log EM
(cm
Sim
23−jul−2008
12:00
0.8 1.0 1.2 1.4 1.6 1.8
Temp (MK)
2.0
1.8
4
Model temp
Model EM
EM (x 1043 cm−3)
Temp (MK)
3
1.6
1.4
2
1.2
1
1.0
Data temp
Data EM
0.8
0
0
100
200
300
400
500
Clockwise distance along arc (arcsec)
42.0 42.5 43.0 43.5 44.0 44.5
Log EM (cm−3)
Friday, March 1, 13
0.8 1.0 1.2 1.4 1.6 1.8
Temp (MK)
REEVES ET AL 2012
FAN 2012
Friday, March 1, 13
Conclusions
XRT observations show hot cavity cores with low
emission measures.
We can do a reasonable job of modeling the
observations with CAVMORPH + FORWARD.
Nougat substructures could be indicative of hot
field lines as in Fan 2012.
More work needs to be done to explain magnetic
field structure that causes the ring shaped nougat.
Friday, March 1, 13