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• W2075283749 abstract "We considered the structure of steady-state plane-parallel radiative shock waves propagating through the partially ionized hydrogen gas of temperature T1 = 3000 K and density 10 −12 gc m −3 ≤ ρ1 ≤ 10 −9 gc m −3 . The upstream Mach numbers range within 6 ≤ M1 ≤ 14. In frequency intervals of hydrogen lines the radiation field was treated using the transfer equation in the frame of the observer for the moving medium, whereas the continuum radiation was calculated for the static medium. Doppler shifts in Balmer emission lines of the radiation flux emerging from the upstream boundary of the shock wave model were found to be roughly one-third of the shock wave velocity: −δV ≈ 1 U1. The gas emitting the Balmer line radiation is located at the rear of the shock wave in the hydrogen recombination zone where the gas flow velocity in the frame of the observer is approximately one-half of the shock wave velocity: −V ∗ ≈ 1 U1. The ratio of the Doppler shift to the gas flow velocity of δV/V ∗ ≈ 0.7 results both from the small optical thickness of the shock wave in line frequencies and the anisotropy of the radiation field typical for the slab geometry. In the ambient gas with density of ρ1 > 10 −11 gc m −3 the flux in the Hα frequency interval reveals the double structure of the profile. A weaker Hβ profile doubling was found for ρ1 10 −10 gc m −3 and U1 < 50 km s −1 . The unshifted redward component of the double profile is due to photodeexcitation accompanying the rapid growth of collisional ionization in the narrow layer in front of the discontinuous jump." @default.
• W2075283749 created "2016-06-24" @default.
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• W2075283749 date "2004-06-01" @default.
• W2075283749 modified "2023-09-25" @default.
• W2075283749 title "The structure of radiative shock waves V. Hydrogen emission lines." @default.
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