termination shock

noun3

1. •
   The boundary marking one of the outer limits of the Sun's influence, where the solar wind dramatically slows.
2. •
   That point for space around any star.
3. •
   A rapid and damaging rise in temperatures once solar geoengineering measures are stopped.

   • If a larger SRM deployment were phased out sufficiently slowly, the rate of warming could be limited, and termination shock avoided, even where it exerted a very large cooling effect. — 2018