Convective wave-packet instability
= Convective wave-packet instability
A localized disturbance grows along some moving rays but decays at its original fixed location. This wave-packet meaning differs from buoyancy-driven stellar convection and is therefore given a distinct canonical title. Changing the observation frame can change the absolute/convective classification. The <Briggs-Bers criterion> uses the laboratory-frame impulse response to distinguish this case from <absolute wave-packet instability>.