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Temperature and Density Diagnostics with SECCHI EUVI

J.S. Newmark

Naval Research Laboratory

(202) 767-0244

newmark@nrl.navy.mil

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EUVI Temperature Response

Contaminating Lines (Mg VII, Si VII)

Contaminating Line (Si XI)

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EIT Temperature Response

Contaminating Lines (Mg VII, Si VII)

Contaminating Line (Si XI)

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EUVI and EIT Fe XV

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Differential Emission Measure

• I(ergs cm-2 s-1 sr-1) = F(atomic physics)* DEM, DEM = Ne2dl/dlogT, assumes optically thin, steady state equilibrium, atomic physics = CHIANTI

• Applications: Solar absolute intensity maps- lines or bandpasses, thermal structure of the solar atmospheric energy balance, model radio thermal bremsstrahlung emission – appropriate for “stable” structures or long term studies, not FLARE related events.

• Loop temperatures and coronal heating

• EIT derived DEMs - Cook et al. 1999, 2003, forward modeling, full disk, pixel-by-pixel DEM maps from 80,000 K - 2.5 MK

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Computing DEM from Starter (tested

for insensitivity)

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Data and Model

Comparison

Fe IX/X and Fe XII

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Data and Model

Comparison Fe XV and

He II

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Intensity Error Maps

(Obs-Model)/Obs

Largest errors due to low S/N

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Intensity Error Histograms (Obs-Model)/Obs

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EIT DEM Determined Irradiance and SOHO SEM Measured

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Average DEMs

Active Region

Quiet Sun

Coronal Hole

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Model Temperature Slices (Log T = 5.0,5/5,6.0,6.5)

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He II (30.4 nm) Bandpass Decomposition

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Maps of Peak Temperature and Slope (LogT)

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Comparison DEM and EM

Isothermal Emission Measure Determined from single ratio – note multi-thermal nature

Ratio emission measureEM/0.3 (LogT range)

Ratio emission measureEM*0.7/0.3 (<EM> over LogT distribution)

Isothermal EM = DEM x LogT

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DEM and Irradiance Software

• Solarsoft + CHIANTI

• EUVI DEM Software

– EUVI_DEM_TOOL

– EUVI_LINE_MAP

– EUVI_IRRAD_SPEC

– 1024x1024x25 array takes ~2 minutes

– User’s beware – please read assumptions in code, e.g. abundance, ionization equilibrium, helium enhancement, etc.

• 170 – 340 Å spectra, 10 Å bins

– Website