Internal Gravity Wave

Observing waves formed by an oscillating rod

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Period: 9 sec



Period: 8 sec



Period: 7 sec



Period: 6 sec



Period: 5 sec



Period: 3.8 sec

The waves emanate from the source at an angle prescribed by the period of oscillation in only four directions.
At a period shorter than the Brunt-Väisälä frequency, waves do not occur.

Experimental conditions

Brunt-Väisälä frequency: 3.9 sec.
Amplitude of the rod: approx. 0.5cm

Photographic conditions

f=135mm, F4.5, 1/15 seconds, ASA400, 2mm slit used.

Filming conditions

5mm slit used.
Speeded up 10 times.
240x180:15fps, 320x240:30fps