Statistics – Computation
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.4115g&link_type=abstract
Journal of Geophysical Research, vol. 85, Aug. 1, 1980, p. 4115-4124. Research supported by the Administration des Terres Austr
Statistics
Computation
2
Geomagnetic Micropulsations, Ionospheric Propagation, Magnetospheric Instability, Spectrum Analysis, Atmospheric Models, Coherence, Conjugate Points, Correlation, Linear Equations, Time Lag
Scientific paper
A technique is described for measuring time delays by using the cross spectrum of Pc 1 recorded at different stations. The method is based upon the computation of the coherency coefficient and of the phase of the cross spectrum. It is applied to data which were obtained during a campaign of observations at two pairs of conjugate stations (L equals 3.7 and L equals 4.5). It is shown that the coherency coefficient between signals recorded at conjugate points may be large (about 1) for structured Pc 1, which implies that the optical path is constant, to within a fraction of a wavelength, over long periods of time (the integration time is of the order of 16 min). Measurements of time delay between the northern and southern hemisphere show that there is generally an asymmetry, the delay being longer for the north to south propagation.
Fargetton H.
Gendrin Roger
Glangeaud F.
Lacoume Jean-Louis
Perraut Sylvaine
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