Abstract
We consider narrow transition regions in accretion disks where an outer standard disk (Shakura-Sunyaev-type disk; SSD) changes to an inner advection-dominated accretion flow (ADAF). By using the WKB method, we show that if the transition occurs in a relatively narrow region, trapped low-frequency oscillations, or slowly growing localized motions, are possible in the transition region. Their characteristic frequencies are much lower than the Keplerian frequency in this region. This type of trapped oscillation may be a possible cause of the 1-15 Hz quasi-periodic oscillations observed in GRS 1915+105.
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