Subplinian phase:
Complex waveform
use of acoustic power Pd :
proportional to gas velocity
gas volume= 1.5 107 m3
6 periods
In very good agreement with the
gas flux deduced
from the height in the
atmosphere
gas flux = velocity x area
gas flux = gas volume/time
Kd = 1/3
Direct measurements (21): Acoustic records
Shishaldin
23/04/99
