Accession Number : AD0699409

Title :   A PRELIMINARY ROCKET INVESTIGATION OF VERY LOW FREQUENCY IONOSPHERIC RESONANCES,

Corporate Author : DEFENCE RESEARCH TELECOMMUNICATIONS ESTABLISHMENT OTTAWA (ONTARIO) RADIO PHYSICS LAB

Personal Author(s) : Barrington,R. E.

Report Date : 1969

Pagination or Media Count : 8

Abstract : A Javelin sounding rocket equipped with two large orthogonal dipole antennae, a VLF receiver and a swept frequency oscillator and pulser was flown at the Churchill Research Range in an attempt to stimulate and detect at least one of the natural resonances of the ionosphere that lie in the VLF band. The pulser and swept frequency oscillator were connected to one of the dipole antennae and the VLF receiver was connected to the second dipole. The amplitude and the rate of change of frequency of the signal coupled through the plasma from the oscillator to the receiver showed no observable change at frequencies in the neighbourhood of the lower hybrid resonance frequency. Average amplitude changes from sweep to sweep of greater than 40 dB were found as the aspect of the rocket changed. Immediately following the cessation of the signals from the oscillator, a burst of noise that had a lower frequency cut-off at the lower hybrid resonance was encountered on many sweeps. These results indicate that it is possible to stimulate, by artificial means, the lower hybrid resonance of the ionosphere, and to use the stimulated signals to determine the frequency of this resonance. (Author)

Descriptors :   (*IONOSPHERE, OSCILLATION), VERY LOW FREQUENCY, SOUNDING ROCKETS, DETECTION, RESONANT FREQUENCY, CANADA, (U)CANADA

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE