The phrase "aft direction" is correct and usable in written English.
It is typically used in nautical or aviation contexts to refer to a direction towards the rear of a vessel or aircraft.
Example: "The crew was instructed to secure all loose items in the aft direction to prevent them from shifting during the storm."
Alternatives: "rear direction" or "backward direction".
Figure 2 also shows a clear asymmetry between the flight and aft direction.
For Swarm-C, 36.46 % of the observations are in forward direction and 63.54 % in aft direction.
For Swarm-A, 37.55 % of the GPS observations are collected in the forward direction of the antenna and 62.45 % in the aft direction.
For Swarm-A, 60.77 % of the GPS observations are collected in the aft direction of the antenna, compared with 63.23 % of the Swarm-C observations, which means that most of the additional observations can again be found in the aft direction of the GPS antenna.
To obtain the minimum elevation angles in flight direction shown in Fig. 2, all observations with azimuth angles between 350° and 10° are used, while the aft direction contains all observations between 170° and 190°.
In flight direction, the minimum elevation angle is a few degrees larger than expected from the FoV setting, while in aft direction, this angle is a few degrees lower.
It included determination of equivalent comfort curves in the vertical and fore and aft directions under one- and two-directional narrowband random vibrations.
The flight and aft directions in the antenna-fixed frame have azimuth angles of, respectively, 0° and 180°.
Non-linearity of the seated human body in the vertical and fore and aft directions was observed.
The effect of the backrest was particularly pronounced for the fore-and-aft direction.
While driving off-road vehicles, operators are exposed to whole-body vibration acting in the fore-and-aft direction.
