Why do you think this effect on the ionosphere is observed on the dayside and not the night side of the earth?

The ionosphere is primarily influenced by solar radiation, which is abundant during the dayside of the Earth. During this time, ultraviolet (UV) and X-ray emissions from the Sun ionize atmospheric particles, creating a dense layer of charged ions. Conversely, on the nightside, the lack of direct solar radiation leads to a significant reduction in ionization, resulting in a much less active ionosphere. Thus, the effects observed in the ionosphere are predominantly tied to the presence of sunlight.