Computer Science – Sound
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31.1083j&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 31, Oct. 1983, p. 1083-1085, 1087-1097.
Computer Science
Sound
5
Correlators, Cross Correlation, Radio Emission, Satellite Sounding, Space Plasmas, Very Low Frequencies, Autocorrelation, Geos 1 Satellite, Spacecraft Antennas, Spectrograms, Wave Propagation
Scientific paper
Natural VLF emissions received by a single antenna can be characterized at each point in the emissions' frequency-time domain by a power and a phase. Emissions received at a single point by two antennas with a fixed relative orientation in space can be similarly described by the cross-spectral power and relative phase. It is shown that the cross-spectral phase contains information on the propagation characteristics of the waves which is better utilized in wave analysis than the power. In fact, the phase information allows weak signals to be identified more readily than is possible from a power spectrogram. It also allows the recognition of waves propagating with different wave normal directions. Data from the GEOS-1 electric and magnetic antennas, pre-processed by the on-board correlator, are used to study the cross-spectral characteristics of VLF hiss and chorus in the earth's magnetosphere.
Jones Damien
Lefeuvre François
Parrot Michel
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