Statistics – Computation
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..132a&link_type=abstract
Journal of Geophysical Research, vol. 83, Jan. 1, 1978, p. 132-144.
Statistics
Computation
8
Geomagnetic Pulsations, Ionospheric Propagation, Propagation Velocity, Very Low Frequencies, Waveguides, Atmospheric Attenuation, Data Acquisition, Data Processing, Group Velocity, Phase Velocity, Terminator Lines
Scientific paper
An experimental study has been conducted on the characteristics of the propagation of mid-latitude Pc 1 micropulsations using a five-station receiving network. All data were telemetered in real time over telephone data lines for centralized recording and analysis. Cross-correlation techniques were used to determine group velocity and direction of arrival using three different computational methods. Amplitude, spectral, and polarization characteristics are presented for the data analyzed. It was found that the propagation direction tended to coincide approximately with that of the geomagnetic meridian in the vicinity of the network of sites and that the propagation was characterized better by curved wave fronts than by plane wave fronts. No examples of east-west propagation were observed, but this is to some extent a consequence of the mid-latitude location of the observation sites. Propagation group velocities ranging from 444 to 1523 km/s were observed. Variation in group velocity for a given event over a period of an hour was typically less than 10%. Attenuation rates ranging from 0 to 13 dB/1000 km, with an average of 6.5 dB/1000 km, were observed.
Althouse E. L.
Davis Raymond Jr.
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