Open AccessCo‐Phase Analysis of Atmospheric Wave Data
Author(s) -
Montes Hernan A.,
Posmentier Eric S.
Publication year - 1971
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1971.tb03400.x
Subject(s) - phase (matter) , rayleigh wave , rocket (weapon) , physics , geology , signal (programming language) , phase velocity , geodesy , acoustics , noise (video) , detector , ionosphere , rayleigh scattering , optics , wave propagation , geophysics , computer science , geography , archaeology , quantum mechanics , artificial intelligence , image (mathematics) , programming language
Summary Co‐phase is a statistic designed for the detection and parameter estimation of signals by detector arrays. Ionospheric motions detected by an array of four phase‐path sounders following a large earthquake are found by the co‐phase technique to have a phase velocity equal to that of seismic Rayleigh waves of the same period, and to arrive from the direction of the epicentre. The calculation of co‐phase for an 80‐min sample of data from an 8‐element array of microbarographs detects the presence of a signal from a high energy event despite a signal‐to‐noise ratio of less than unity. Co‐phase analysis of acoustic signals generated by the Saturn‐Apollo rocket launches indicates that these signals originate at ionospheric heights and propagate in a waveguide between a soundspeed maximum and a steep density gradient in the mesosphere.