Modeling of UV radiation from high altitude plumes and comparison with data from the Mir space station

S. F. Gimelshein, D. A. Levin, J. A. Drakes, G. F. Karabadzhak, M. S. Ivanov

Research output: Contribution to conferencePaper

Abstract

Modeling and calculations are presented with the goal of elucidating possible mechanisms of ultraviolet radiation from a Soyuz-TM spacecraft plume interacting with the ambient gas at altitudes of about 380 km, observed during MirEx experiment. The studies were performed with the direct simulation Monte Carlo method. The results presented include the sensitivity study of the simulations to different parameters of the numerical technique and an investigation of different radiation mechanisms. Among the mechanisms considered was the formation of OH(A) due to water dissociation by atomic O, collisional excitation of OH(X), and the formation of NH(A) by the reactions of atomic 0 with hydrazine fragments. The simulations are found to overpredict the data by approximately by a factor of 5 to 70, depending on the parameters of chemistry model chosen for water dissociation. However, the simulations are in close agreement with the variations observed in the near-field plume intensities as a function of mission elapsed time.

Original languageEnglish (US)
StatePublished - Jan 1 1998
Externally publishedYes
Event33rd Thermophysics Conference, 1999 - Norfolk, United States
Duration: Jun 28 1999Jul 1 1999

Other

Other33rd Thermophysics Conference, 1999
CountryUnited States
CityNorfolk
Period6/28/997/1/99

ASJC Scopus subject areas

  • Engineering(all)

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    Gimelshein, S. F., Levin, D. A., Drakes, J. A., Karabadzhak, G. F., & Ivanov, M. S. (1998). Modeling of UV radiation from high altitude plumes and comparison with data from the Mir space station. Paper presented at 33rd Thermophysics Conference, 1999, Norfolk, United States.