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Range safety signal attenuation by the space shuttle main engine exhaust plumes
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Pearce, B. E. |
| Copyright Year | 1983 |
| Description | An analysis of attenuation of the range safety signal at 416.5 MHz observed after SRB separation and ending at hand over to Bermuda, during which transmission must pass through the LOX/H2 propelled main engine exhaust plumes, is summarized. Absorption by free electrons in the exhaust plume can account for the nearly constant magnitude of the observed attenuation during this period; it does not explain the short term transient increases that occur at one or more times during this portion of the flight. It is necessary to assume that a trace amount (about 0.5 ppm) of easily ionizable impurity must be present in the exhaust flow. Other mechanisms of attenuation, such as scattering by turbulent fluctuations of both free and bound electrons and absorption by water vapor, were examined but found to be inadequate to explain the observations. |
| File Size | 2498207 |
| Page Count | 38 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19830016260 |
| Archival Resource Key | ark:/13960/t09w58q24 |
| Language | English |
| Publisher Date | 1983-04-19 |
| Access Restriction | Open |
| Subject Keyword | Ground Support Systems And Facilities (space) Shock Layers Space Shuttle Main Engine Refractivity Wakes Rocket Exhaust Water Vapor Exhaust Emission Radio Attenuation Range Safety Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
