Audible and Inaudible Sounds | Characteristics of Infrasound, Ultrasound and Audible Sound

Node hypothesis:The daily n values show large fluctuations and tend to revert to their long-term mean as halving dates approach (see animation).Because the pattern in the post above resembles a vibrating string - with harmonics - fixed at its ends (nodes), I have referred to it as such for lack of a better term.