• WARMEST WATER 

 O COLDEST WATER 



ORDER OF WAVE PROGRESSION 



TIME WAVE ACTIVATES ARRAY 



Progressive temperature oscilla- 

 tions across the horizontal array 

 provide data for wave-coherence 

 studies. The sensor first activated 

 is the one nearest the oncoming 

 wave. Successive sensors activated 

 indicate the direction of propaga- 

 tion. Cross-spectral analysis be- 

 tween sensors reveals the speed, 

 direction, and coherence of the 

 internal wave. 



PROPAGATION DIRECTION 

 OF INTERNAL WAVES 



POSITION OF 



SENSORS IN 



ARRAY 



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Analog recording of the temperature data from the array. Data are presented as isotherms 

 on a space-time plot. Since the internal waves propagate from a west-southwest direction, 

 the isothermal curves on the analog recording bulge to the left, or earlier position with 

 respect to time. Analyses are made from parallel recorded digital data. 



39 



