Trough: A valley of low atmospheric pressure, as opposed to a ridge of high pressure.
Cold trough
When a certain amount of cold and ascending air in and ahead of a trough is advected over warmer land or sea, an unstable situation may arise causing Cb's to form.
A trough of low pressure is an extended area of low pressure. On the weather chart, it has associated with it a trough line. The pressure there is lower than that at neighbouring points on either side of the trough line.
col ...
trof: ≡ trough, 20.1.1
tropics, 20.3.1
trough: definition, 20.1.1
true airspeed: definition, 2.1
true altitude: definition, 20.2.2
true north, 14.2.2
tumbling gyro, 6.2.4, 18.7
turbulent flow, 18.4.2, 18.4.3, 3 ...
Hans Burkhard's ultimate solution was the "Gotha tunnel," a trough connecting an aperture in the upper decking with a large opening extending across the bottom of the rear fuselage.
In other words the "trough" of one sound wave (the noise caused by the propeller) corresponds to the "crest" of another (the "antinoise" created by the headset).
Jet stream segments move with pressure ridges and troughs in the upper atmosphere. In general, they travel faster than the weather pressure systems, and maximum wind speed varies as the segments progress through the systems.
 See also: Speed, Flight, Wind, Pilot, Aircraft
  
|
RSS
