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The unqualified term instability strip usually refers to a region of the Hertzsprung–Russell diagram largely occupied by several related classes of pulsating variable stars: [1] Delta Scuti variables, SX Phoenicis variables, and rapidly oscillating Ap stars (roAps) near the main sequence; RR Lyrae variables where it intersects the horizontal ...
Interchange instability. The interchange instability, also known as the Kruskal–Schwarzchild instability or flute instability, is a type of plasma instability seen in magnetic fusion energy that is driven by the gradients in the magnetic pressure in areas where the confining magnetic field is curved. [1]
Conditional symmetric instability. Weather radar loop showing intense snow bands (lighter color) due to CSI ahead of a warm front. Conditional symmetric instability, or CSI, is a form of convective instability in a fluid subject to temperature differences in a uniform rotation frame of reference while it is thermally stable in the vertical and ...
The two-stream instability is a very common instability in plasma physics. It can be induced by an energetic particle stream injected in a plasma, or setting a current along the plasma so different species ( ions and electrons) can have different drift velocities. The energy from the particles can lead to plasma wave excitation.
Borderline personality disorder ( BPD ), also known as emotionally unstable personality disorder ( EUPD ), [16] is a personality disorder characterized by a pervasive, long-term pattern of significant interpersonal relationship instability, a distorted sense of self, and intense emotional responses. [9] [17] [18] Individuals diagnosed with BPD ...
Streaming instability. In planetary science a streaming instability is a hypothetical mechanism for the formation of planetesimals in which the drag felt by solid particles orbiting in a gas disk leads to their spontaneous concentration into clumps which can gravitationally collapse. [1] Small initial clumps increase the orbital velocity of the ...
The Pomeranchuk instability is an instability in the shape of the Fermi surface of a material with interacting fermions, causing Landau ’s Fermi liquid theory to break down. It occurs when a Landau parameter in Fermi liquid theory has a sufficiently negative value, causing deformations of the Fermi surface to be energetically favourable.
