Stars less than about 2.25 solar masses experience what specific event when helium ignition begins in the core of a Red Giant?

Answer

The Helium Flash

In lower-mass Red Giants, the ignition of helium fusion in the core occurs suddenly in an event specifically termed the Helium Flash.

Stars less than about 2.25 solar masses experience what specific event when helium ignition begins in the core of a Red Giant?
astrophysicscelestial bodystar evolutionstellar massStar lifecycle