Accession Number : AD0753077

Title :   Chemical Injection into a Reentry Plasma to Improve High Power EM Wave Transmission.

Descriptive Note : Physical sciences research papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Papa,Robert J.

Report Date : 18 SEP 1972

Pagination or Media Count : 35

Abstract : For purposes of electronic countermeasures, it is desirable to maximize the amount of power that can be transmitted from a reentry vehicle by supppressing the onset of antenna voltage breakdown. This can be accomplished by injecting chemicals into the reentry plasma sheath. The report describes a numerical procedure for calculating the amount of power that can be transmitted through a chemically seeded plasma. The power levels of a plane electromagnetic wave incident on a reentry plasma slab are sufficient to induce electron temperature changes. As a result, the electron density and effective collision frequency vary with time. (Author)

Descriptors :   (*RADIO TRANSMISSION, PLASMA SHEATHS), (*ATMOSPHERE ENTRY, BLACKOUT(PROPAGATION)), (*ELECTRONIC COUNTERMEASURES, REENTRY VEHICLES), ELECTRON DENSITY, RECOMBINATION REACTIONS, PARTIAL DIFFERENTIAL EQUATIONS, NONLINEAR DIFFERENTIAL EQUATIONS, NUMERICAL INTEGRATION, TRANSPORT PROPERTIES

Subject Categories : Countermeasures
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE