  The solar photosphere, chromosphere and corona are known to rotate
differentially as a function of latitude. To date, it is unclear if the solar
transition region also rotates differentially. In this paper, we investigate
differential rotational profile of solar transition region as a function of
latitude, using solar full disk (SFD) images at 30.4 nm wavelength recorded by
Extreme Ultraviolet Imager (EUVI) onboard Solar Terrestrial Relations
Observatory (STEREO) space mission for the period from 2008 to 2018 (Solar
Cycle 24). Our investigations show that solar transition region rotates
differentially. The sidereal rotation rate obtained at +/- 5 degree equatorial
band is quite high (~ 14.7 degree/day), which drops to ~ 13.6 degree/day
towards both polar regions. We also obtain that the rotational differentiality
is low during the period of high solar activity (rotation rate varies from
14.86 to 14.27 degree/day) while it increases during the ascending and the
descending phases of the 24th solar cycle (rotation rate varies from 14.56 to
13.56 degree/day in 2008 and 14.6 to 13.1 degree/day in 2018). Average sidereal
rotation rate (over SFD) follows the trend of solar activity (maximum ~ 14.97
degree/day during the peak phase of the solar activity, which slowly decreases
to minimum ~ 13.9 degree/day during ascending and the descending phases of the
24th solar cycle). We also observe that solar transition region rotates less
differentially than the corona.
