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[[Image:Broadband_Emissivity_basalt.png|left|500px]] [[Image:Broadband_Emissivity_dust.png|center|500px]] | [[Image:Broadband_Emissivity_basalt.png|left|500px]] [[Image:Broadband_Emissivity_dust.png|center|500px]] | ||
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For a wide range of surface temperatures (50-500K), the broadband apparent emissivity only changes by small factors (1-2% at most). | For a wide range of surface temperatures (50-500K), the broadband apparent emissivity only changes by small factors (1-2% at most). | ||
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| + | Analysis and plot generated using this algorithm: [[File:KRC_Emissivity_T.dv]] | ||
Conclusion: Excellent fits to these behaviors can be obtained with polynomial functions. This is a small overall effect. | Conclusion: Excellent fits to these behaviors can be obtained with polynomial functions. This is a small overall effect. | ||
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Latest revision as of 15:58, 14 January 2019
k(T) all layers
k(T) = A+B*T+C*T^2+D*T^3
NOTE: Not just 2 domains/layers, but All
Cp(T) all layers
Cp(T) = A+B*T+C*T^2+D*T^3
NOTE: Not just 2 domains/layers, but All
Surface/Atmosphere Sensible heat exchange Q
Q = h × (Tsurf - Tatm)
NOTE: Tsurf is the kinetic surface Temperature; Tatm is the air temperature near the surface; Q is an additional heat flux term at the surface; h is a convective heat transfert coefficient.
Temperature-dependent Emissivity ε(T)
ε(T) = A + BxT + CxT^2 + DxT^3
NOTE: Keihm 1984 + Birkebak 1974
An analysis of the impact of ε(T) is performed using a typical TES basalt (File:bandfield epf derived basalt spectrum.txt) and a typical TES dust (File:bandfield epf derived dust spectrum.txt).
Equivalent broadband emissivities as a function of temperature are shown below.
For a wide range of surface temperatures (50-500K), the broadband apparent emissivity only changes by small factors (1-2% at most).
Analysis and plot generated using this algorithm: File:KRC Emissivity T.dv
Conclusion: Excellent fits to these behaviors can be obtained with polynomial functions. This is a small overall effect.
