Final answer:
Brighter refraction by plate-like ice crystals at the same elevation as the sun near the 22-degree halo produces parhelia, also known as sun dogs.
Step-by-step explanation:
The refraction of light by plate-like ice crystals at the same elevation as the sun near the 22-degree halo produces a phenomenon called parhelia. Parhelia are also known as sun dogs, and they appear as bright spots on both sides of the sun, often forming a vertical line.