No abstract

No abstract

In a new type of radio propagation experiment, radio waves of both magnetoionic modes are radiated from a pair of ground‐based transmitters to a Nike Apache rocket. A power ratio of 10 db at the rocket is maintained by a servoloop that includes the transmitters, the rocket‐borne receiver, and the telemetry system. The frequencies of the two modes are controlled by crystals that differ in frequency by 500 hz. The central frequency is 3385 khz. This technique facilitates measurement of ionospheric Faraday rotation and differential absorption by well‐calibrated instrumentation located on the ground. A method of analyzing Faraday and absorption data, based on the generalized magnetoionic theory, is developed and applied to rocket data to obtain electron concentration and collision frequency, and to calibrate a Langmuir‐type electron current probe that measures the fine structure of the electron concentration profile. Results of a typical flight are shown in which electron concentrations are determined in the altitude range 55–105 km and collision frequencies in the range 85–105 km.

No abstract

No abstract