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Rossby wave instability

(RWI)
(type of disk instability that may be a factor in planet formation)

A Rossby wave instability (RWI) is a phenomenon that can occur in a disk (protoplanetary disk or accretion disk) that makes the disk change from a smooth profile to less regular. It involves a positive feedback making small density "lumps" expand. A mechanism by which Rossby waves (in Keplerian disks) produce such an instability is termed a Rossby wave instability.

Some theories of planet formation depend on such an instability, considering it as producing the high-density regions that result in planets.


(planetary disk,disturbance)
http://en.wikipedia.org/wiki/Rossby_Wave_Instability_in_Astrophysical_Discs

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