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April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Kelly E. Korreck
Harvard-Smithsonian Center for Astrophysics
Cambridge, MA
X-ray Observations of Solar Magnetic Reconnection Sites
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Outline
• The satellite and the instruments
• What was the state of understanding with Yohkoh
• Science questions to be answered
• First look at Hinode data
• What else we will do with Hinode data
• Other questions/future work
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
HINODE (Solar-B)
JAXA, NASA, & PPARC– Solar Optical Telescope (SOT)
• Magnetic fields, photosphere, & Chromosphere (LM, NAOJ)
– EUV Imaging Spectrometer (EIS)• Transition Region, Corona (170-210 Å &
250-290 Å) (NRL, MSSL)
– X-ray Telescope (XRT)• Corona, Soft X-rays (6-200 Å)• G-band 4305 Å • SAO & JAXA
Sept 22, 2006
Uchinoura Space Center, Japan
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
• Wolter-I grazing incidence mirror with co-focal visible light optics
• 2048x2048 back-illuminated CCD 13.5 µm pixel size
FOV 34 x 34 arcmin
Plate scale 1”/pixel
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Field of View
• SOT– Broadband Filter Imager
(BFI)
– Narrowband Filter Imager (NFI)
• EIS– 1” & 2” slits
– 40” & 266” wide Slots
• XRT– Full Sun & smaller
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Theoretical Temperature response for unit volume emission measure of 1044.0cm-3 for each filter.
Transmission profiles for filters, X-ray reflectivity of mirror, & qE of CCD detector are taken into account.
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Filter comparison
Al Poly
Al-Poly
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Filter comparison
C Poly
C-Poly
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Filter comparison
Be Thin
thin-Be
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Filter comparison
Be ThinAl Poly C Poly
11/22/2006 17:53UT
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
SXT&XRT
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
SXT&XRT
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
XRT & SXI
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
TRACE & XRT are Complimentary
XRT 11/13/06
TRACE 11/13/06
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
First 90 days
• Coronal Voids
• X-flare
• Jets, Outflows, Downflows
• Coordinated observations with EIS & SOT
• Global Coronal Activity
• Quiet Sun
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Loops on the Limb
QuickTime™ and aPNG decompressor
are needed to see this picture.
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Determining Temperatures
•Useful for understanding location of flare heating, cooling processes in flares and solar eruptions.
•Method 1 - Filter Ratios
•Method 2 - Differential Emission Measure Analysis
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Observations
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Filter Ratio Analysis
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Filter Ratios
* **
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Filter Ratio Analysis
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
DEM Analysis
•Method developed by M. Weber, E. DeLuca, L. Golub (see L. Golub et al., 2004)
•DEM determined by a least-squares minimization algorithm
•Random error generation for determining DEM errors
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
DEM Analysis
ambient corona flare loop
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
DEM Analysis
ambient corona flare loop
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Emission Measures inDifferent Temperature Bins
2-3 MK 3-5 MK 5-10 MK
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Emission Measures inDifferent Temperature Bins
10-20 MK 20-50 MK 50-100 MK
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Where is the Hot Plasma?
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Conclusions so far...•Post-flare loops contain multi-
thermal plasma, ambient corona is closer to two-temperature plasma
•Hot plasma is not well determined using this method with only XRT data
•RHESSI data should be useful in constraining high temperature plasma
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Stay tuned for more great XRT flare data as solar maximum
approaches...
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
CMS models
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Acknowledgements
• P. Jibben for this wonderful template
• The entire XRT SAO team
April 18, 2023Kelly E. Korreck
Smithsonian Astrophysical Observatory
Access To Hinode Data
• Chief Coordinators:– John Davis (john.m.davis@nasa.gov)– Tetsuya Watanabe (watanabe@uvlab.mtk.nao.ac.
jp)• Science Schedule Coordinators (in U.S.):
– SOT: T. Berger (berger@lmsal.com)– XRT: L. Golub (golub@cfa.harvard.edu)– EIS: J. Mariska (mariska@nrl.navy.mil)
• XRT Observing (XOB) Proposals: http://solar.physics.montana.edu/HINODE/XRT
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