Video Title: (Oscillations At The Edge Of Saturns B Ring 720p)
Video Duration: 0:16
From: djxatlanta
Category: Science and Technology
this movie, made from images obtained by nasa's cini spacecraft of the outer edge of saturn's b ring, reveals the combined effects of a tugging moon and oscillations that can naturally occur in disks like saturn's rings and spiral galaxies. the b ring is shown at the lower left of the frame, and its outer edge varies with time, moving in and out in this concatenation of 92 images, each taken about 6 minutes apart, over the span of 9 hours, 30 minutes. the cini division, the division between the a and b rings once thought to be empty, dominates the upper right of the frame. the huygens ringlet runs across the middle of the frame from the upper left to lower right. at its innermost radial distance, the b ring's edge is 117470 kilometers 72992 miles from the center of saturn. at its outermost radial distance, the b ring's edge is 117670 kilometers 73117 miles from the center of saturn. these variations amount to a difference of 200 kilometers about 120 miles. cini scientists have determined that the complicated radial variations in the b ring edge are caused by the presence of four scalloped patterns, all independently rotating around the ring. one pattern, with two lobes, is present because of the gravitational perturbations from the moon mimas, which alter the ring particle orbits because of a repeive configuration of particle and satellite orbital positions known as a lindblad resonance this pattern always stays fixed with respect to mimas. the other ltbgt...lt bgt
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