His pioneering work, with colleagues, showed the first hints of spiral structure in the interstellar gas, revealed differential rotation in our Galaxy, and established a revised Galactic coordinate system still in use today.
32.
For example, the three-dimensional object physics calls angular velocity is a differential rotation, thus a vector in the Lie algebra \ mathfrak { so } ( 3 ) tangent to SO ( 3 ).
33.
But other regions of the Sun are known to rotate at very different rates, and the effects of this differential rotation and shearing of the gases in contiguous zones have yet to be learned.
34.
Although the details of sunspot generation are still a matter of research, it appears that sunspots are the visible counterparts of magnetic flux tubes in the Sun's convective zone that get " wound up " by differential rotation.
35.
Since the solar magnetic field is continually wound up due to the faster rotation of mass at the sun's equator ( differential rotation ), sunspot activity will be more pronounced at solar maximum where the magnetic field is more twisted.
36.
The result of the Sun's differential rotation is that the active regions always arise in two bands parallel to the equator and their extension increases during the periods of maximum of the solar cycle, while they almost disappear during each minimum.
37.
As the two galaxies briefly orbit each other, these distorted regions, which are pulled away from the main body of each galaxy, will be sheared by the galaxy's differential rotation and flung off into intergalactic space, forming "'tidal tails " '.
38.
Observations of short term variations in the chromatic activity suggest that the star undergoes differential rotation, with a rotation period of about 11 13 days . Its surface has a measured activity cycle of 16.6 years, compared to 11 years on the Sun.
39.
The magnetic field of a rotating body of conductive gas or liquid develops self-amplifying electric currents, and thus a self-generated magnetic field, due to a combination of differential rotation ( different angular velocity of different parts of body ), Coriolis forces and induction.
40.
The effectiveness of the image upon the viewer is attributed to what E . B . Goldstein has called the'differential rotation effect .'Because of this effect, Kitchener's eyes and his foreshortened arm and hand appear to follow the viewer regardless of the viewer's orientation to the artwork.
