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hot spot



  1. A center of persistent volcanism, thought to be the surface expression of a rising hot plume of magma in a planetary mantle (as seen, for example, on Earth and on Io). Some hot spots are located on constructive mrgins, such as Iceland; others occur within plates, for example Hawaii.

       • GEOLOGY AND PLANETARY SCIENCE


  2. A small, bright region (also known as a bright spot) in a cataclysmic binary, located either where the matter stream collides with the outer edge of the accretion disk, or at the inner edge of the disk.

       • STELLAR ASTROPHYSICS


  3. A small, radio-bright region in a lobe of a radio galaxy, thought to be caused by high-speed material in a jet colliding with boundary between the lobe and the intergalactic medium.

       • GALAXIES