Accession Number : AD0486730

Title :   APPLICATION OF RESULTS FROM SHOCK TUBE EXPERIMENTS ON RADIATION IN AIR TO OBSERVED TRAJECTORIES AND RADIATION OF METEORS.

Descriptive Note : Research note,

Corporate Author : BELL TELEPHONE LABS INC WHIPPANY NJ

Personal Author(s) : Cook, A. F.

Report Date : NOV 1962

Pagination or Media Count : 16

Abstract : An outline of the present state of knowledge of the physics of meteors is presented insofar as it is required to permit application of the results on radiation from shock heated air. It appears that the radiative heat fluxes predicted by Kivel and by Teare, Georgiev and Allen for equilibrium air and the nonequilibrium region are not seriously too small. On the other hand, there is a discrepancy between the observed radiation of the first positive group of nitrogen bands and that predicted for the non-equilibrium shock radiation for one meteor. The meteor produces three orders of magnitude more radiation than predicted. It is proposed that this may be a phenomenon generated by ablation as droplets of an open needlework structure indicated for cometary meteors. The source of the radiation would then have been the common vapor wake of the droplets, each of which, as individuals, must be in free molecular flow. Alternatively, radiation emitted away from the stagnation region may be the cause. (Author)

Descriptors :   (*METEORS, ATMOSPHERE ENTRY), RAREFIED GAS DYNAMICS, SHOCK TUBES, HEAT FLUX, THERMAL RADIATION, AIR, NITROGEN, ABLATION, WAKE, STAGNATION POINT, HEAT TRANSFER, KINETIC ENERGY, DECELERATION, DRAG, MOLECULAR SPECTROSCOPY, EQUATIONS OF MOTION, DESCENT TRAJECTORIES, TRAJECTORIES, VELOCITY.

Subject Categories : Astrophysics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE