Observational characteristics of oscillations and waves in and around sunspots. Difficulties in observing and interpreting
This paper summarizes the body of work that we have done over the years on the oscillation processes in sunspots, including their umbra, penumbra, and close vicinity.The study analyzes a number of aspects that impede adequate determining of some characteristics of propagating oscillations and lead to misinterpretation.Using running penumbral waves