23 july 2002
DESCRIPTION
23 July 2002. Brian Dennis NASA/GSFC 26 July 2013. 23 July 2002. 23 July 2002. 23 July 2013 A1 and A3 Attenuator States. Note 3 distinct peaks. 23 July 2002. 2vth + thick + broad Gaussian at 9.13 keV. 23 July 2002 First A1 to A3 transition. - PowerPoint PPT PresentationTRANSCRIPT
23 July 2002
Brian DennisNASA/GSFC26 July 2013
23 July 2002
23 July 2002
23 July 2013A1 and A3 Attenuator States
Note 3 distinct peaks
23 July 2002
2vth + thick + broad Gaussian at 9.13 keV
23 July 2002First A1 to A3 transition
Count-flux spectrum below ~6 keV stays flat independent of slope in the 11 to 20 keV range where the K-escape events originate.
For K-escape to explain the counts below 5 keV, count flux at 3 keV should depend on count flux at 14 keV count flux at 5 keV should depend on count flux at 16 keV
Detector Response MatrixCompton minimum = 0.01 x photopeak amplitude
A1 Attenuator state A3 Attenuator state
Detector Response MatrixCompton minimum = 1% of photopeak amplitude
A1 Attenuator state A3 Attenuator state
Compton MinimumMinimum Energy = 5 keV
23 July 2002Minimum Compton Continuum Probability (MCCP)
MCCP = 1.e-4 MCCP = 5.e-5
23 July 2002Minimum Compton Continuum Probability (MCCP)
MCCP = 5.e-5
23 July 2002Late A3 to A1 Transition
K-Escape and Compton ChangesAttenuator State A1
Interval #5
K-Escape ChangesA3 Attenuator State
Interval 6 Interval 31
Plotted absolute value of K-escape change since it is an increase in counts at energies below the germanium K-edge at 11 keV and a decrease above 11 keV.
K-escape and Compton ChangesInterval 32
K-escape tweak = 1.1Compton minimum = 0.0
Germanium K-shell Energies
• Kα1 – 9.88 keV• Kα2 – 9.86 keV• Kβ1 – 10.98 keV• Kβ2 – 11.10 keV• Kβ3 – 10.975 keV• Kβ5 – 11.074 keV• K-edge – 11.1 keV• drm_mod(0) = 0.1• drm_mod(1) = -0.19
kescape_tweak = 5
Germanium K-edge Energy
• K-alpha – 9.88 keV• K-edge – 11.1 keV• kescape_tweak = 1.1• drm_mod(0) = 0.6• drm_mod(1) = -0.45 keV
Energy Calibration
23 July 2002Compton_min = 1.e-4
23 July 2002Compton_min = 4e-3
23 July 2002Compton_min = 0.01
23 July 2002A3 to A1 Change
23 July 2002 Compton_min = 0.01K-escape_tweak = 1.1
23 July 2002
Failure to fit Interval #6
kescape_tweak = 1.4
Excess counts below 6 keV
23 July 2002Detector #4
Multitherm_powThick2Albedokescape_tweak = 1.4
10 keV peak FWHM <0.4 keVFe
abu
ndan
ce
(frac
tion
of c
oron
al)
23 July 2002Detector #4
Multitherm_powThick2Albedokescape_tweak = 1.4
10 keV peak FWHM <2 keVFe
abu
ndan
ce
(frac
tion
of c
oron
al)
DEM at 2 keV
Max. Temperature
DEM power-law index
Gaussian Line Intensity
DEM at 2 keV
23 July 20013
23 July 2002thick2_norm
Flux at 50 keV
Delta1
Elow in keV
Flux at 50 keV
Fe Abundance
23 July 2002Fe Abundance
23 July 2002Ireland et al. ApJ, 769:89, 2013
• Interval: 00:30:00–00:30:20.250 UT• Energy: 15 to 500 keV• Energy bins: 90• Detector #4
Parameter Values Ireland et al. ApJ, 769:89, 2013
Thermal plasma
EM 1049 cm−3 2.16 Free
Temp. (kT) keV 3.18 Free
Abundance Coronal 1 Fixed
Non-thermal electrons
A, flux at Ep 1035 s−1 keV−1 0.028 FreeEc keV 32.0 FreeEp keV 50 FixedEb keV 256 FreeEh keV 32,000 Fixedδ1 3.40 Freeδ2 3.92 Free
Nuclear template
Normalization photons cm−2 2.11 Fixed