Let's listen to ions

"The aurora borealis, or 'northern lights' -- captured here by Space Shuttle Endeavor astronauts in 1992 -- emits strong radio waves that can be translated into audible sound when channeled through very-low-frequency radio receivers. Dr. Curt Szuberla, a math teacher at North Pole High School in North Pole, Alaska, and a student team of aspiring engineers braved the elements this winter to build and install a VLF receiver that will enable NASA to continuously Web-stream the 'Earth music' of the aurora and other natural phenomena."