RE-ENTRY COMMUNICATIONS STUDIES UTILIZING SEEDING TECHNIQUES.
Final scientific rept. 21 Mar 63-31 Mar 65,
MCDONNELL AIRCRAFT CORP ST LOUIS MO RESEARCH DIV
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The object of this research was to determine the effects of chemical seedants on the electron concentration of an rf generated air plasma. Hot and cold uncontaminated air plasmas were generated by means of a 25 kW 1 Mc rf generator. A maximum electron density of 2 x 10 to the 12th power electronscc was obtained at a pressure of 0.37 torr and air flow of 7.5 x 0.00001 lbsec. Water, 50 solution of water and ethanol, ethanol, and benzene were added in quantities from zero to 12, 6, 10 and 18 respectively by weight. A radial transmission line was used to measure the electron density and collision frequency. For the hot plasma the results showed that a 1 by weight addition of the seedants reduced the electron concentration to approximately 50 of the original concentration and an addition of 6 reduced the concentration to 25 of the original value. No appreciable difference in electron reduction effects was observed for the four seedants on a weight basis. The electron reduction effects of the seedants in the zero to 1 by weight addition range was considerably greater than that predicted by the first law assuming complete dissociation of the seedant. Author
- Plasma Physics and Magnetohydrodynamics
- Spacecraft Trajectories and Reentry
- Radio Communications