What name is given to an irregular dark line or streak often seen in H _$\alpha$ photographs of the solar photosphere, often associated with sunspots?

Question

Quizplus · Accepted Answer

Filaments are indeed the irregular dark lines or streaks observed in H-alpha photographs of the solar photosphere, often found in association with sunspots. They are manifestations of solar material that is cooler and denser than the surrounding material, suspended above the Sun's surface by magnetic fields.

What Name Is Given to an Irregular Dark Line or Streak