The cloud exhibits no relative motion in the direction of propagation, so this is a purely transverse motion.
Aberration is the change in an object's apparent direction caused by the relative transverse motion of the observer.
Thus trunk motion should remain mostly stable with little motion except for slight rotation as excessive movement would contribute to transverse motion and wasted energy.
Rayleigh waves include both longitudinal and transverse motions that decrease exponentially in amplitude as distance from the surface increases.
While linear, this equation has a more complex form than the equations given above, as it must account for both longitudinal and transverse motion:
When flow is turbulent, particles exhibit additional transverse motion which enhances the rate of energy and momentum exchange between them thus increasing the heat transfer and the friction coefficient.
For this reason, astrometry characterises the transverse motions of stars in angular measure (e.g. arcsec per year) rather than in km/sec or equivalent.
Jet damping or thrust damping is the effect of rocket exhaust removing energy from the transverse angular motion of a rocket.
Wolf 359 first came to the attention of astronomers because of the relatively high rate of transverse motion against the background, known as the proper motion.
Long term observation of these features has shown variations, possibly caused by the transverse motion of an extended cloud extending 10-10 Astronomical Units.