Oui, c’est ça. C’est l’action (l’attraction gravitationnelle) du moonlet (satellite mineur dit WP[fr]) qui perturbe la matière de l’anneau.
Satellite mineur — Wikipédia
▻https://fr.wikipedia.org/wiki/Satellite_mineur
Trois types de satellites mineurs ont été décrits ou discutés :
• des objets enchâssés dans un anneau planétaire, comme les satellites à hélice des anneaux A, B et F de Saturne.
[…]
Comme toujours, (beaucoup) plus détaillé dans WP[en]
Rings of Saturn - Wikipedia
▻https://en.wikipedia.org/wiki/Rings_of_Saturn#Moonlets
Moonlets
In 2006, four tiny “moonlets” were found in Cassini images of the A Ring. The moonlets themselves are only about a hundred metres in diameter, too small to be seen directly; what Cassini sees are the “propeller”-shaped disturbances the moonlets create, which are several kilometres across. It is estimated that the A Ring contains thousands of such objects. In 2007, the discovery of eight more moonlets revealed that they are largely confined to a 3000 km belt, about 130,000 km from Saturn’s center, and by 2008 over 150 propeller moonlets had been detected. One that has been tracked for several years has been nicknamed Bleriot.