Emission and absorption of radiant energy in a model planetary atmosphere.

Myer, H. G.; Ohrenberger, J. T.; Thompson, T.

doi:10.2514/3.3347

Cited by 8 publications

(1 citation statement)

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“…Wilson and Nicolet presented the results of this method in terms of a cross section for both carbon ion-electron recombination and neutral carbon freefree radiation. The absorption coefficient was easily obtained from the expression (6) E t = 1.435 X The primary features concerning the carbon continuum are that the carbon cross section is about an order of magnitude greater than the nitrogen cross section for wavelengths greater than 850 A, that the carbon continuum has 85% of its emission at wavelengths less than 1250 A, and that the interaction of the CO (4+) band system and the carbon continuum is negligible for heat-transfer considerations. Since the cross sections of Wilson and Nicolet are felt to be the best available, they were used in the present work.…”

Section: Theoretical Methodsmentioning

confidence: 99%

Radiative transfer properties of a shocked Venus model atmosphere

Deacon

Rumpel²

1971

Journal of Spacecraft and Rockets

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An analytical investigation of the equilibrium radiation of shocked 80% CO 2 , 20% N 2 was performed using the constant property flat slab model including non-gray self-absorption for typical Venus entry conditions. It was found that the important radiators are the fourth positive group of CO, the continuum from carbon, and the line emission from neutral carbon. The method was compared with available experimental data and good agreement was found. Most of the radiation was found to occur in the middle and far ultraviolet portions of the spectrum. The heat-transfer results are presented in a form which is useful for approximating radiation loads on a Venus entry vehicle. NomenclatureB\ = Planck function c = speed of light E t = radiance Ei = third exponential integral e = electron charge /» = oscillator strength h = Planck constant k = Boltzmann constant ra = electron mass NLi -number density of absorbing state q R = radiation flux 7*0 = classical electron radius RN = nose radius U m = freestream velocity VE = entry velocity j8 = ballistic coefficient T = radiation-cooling parameter 7# = entry angle 7i = half width A = slab thickness X = wavelength MX = absorption coefficient v = frequency p = density po = Earth standard density p m = freestream density o-\ -cross section for photon absorption Subscripts X = at a wavelength at a frequency = before shock

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Section: Theoretical Methodsmentioning

confidence: 99%