Flight results of a 25000-foot-per-second reentry experiment using microwave reflectometers to measure plasma electron density and standoff distance

four- frequency microwave reflectometer having an electron density measurement range from approximately 1010 to 1013 electrons/cm3. Good correlation exists between the reflectometer- determined plasma values and those obtained from electrostatic probes and other flight data taken during this experiment. Measured and computed plasma electron densities in the nose region generally agree except

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