This is actually the characteristic atmosphere in the termination shock period. At far with the Sun, the supersonic photo voltaic wind are going to be held back from even further expansion from the interstellar wind. The main feature encountered by a spacecraft due to this interstellar wind–solar wind conversation https://metallica-wall-art08257.tkzblog.com/12436065/the-ultimate-guide-to-voyager-one-sounds-of-the-earth-record