The Voyager 1  space probe is currently over 19.5 billion kilometers from earth and considered to be in interstellar space. It still occasionally detects waves in the extremely thin haze of  ionize particles that it is flying through. The waves are driven by coronal mass ejections from the sun.

The Voyager 1 spacecraft has experienced three “tsunami waves” in interstellar space. This kind of wave occurs as a result of a coronal mass ejection erupting from the sun. The most recent tsunami wave that Voyager experienced began in February 2014, and may still be going. Listen to how these waves cause surrounding ionized matter to ring like a bell.