Recent Examples on the WebOn June 24, Juno crossed Jupiter's bow shock, and the next day, Juno crossed the magnetopause. Avery Thompson, Popular Mechanics, 1 July 2016 The bow shock is like Jupiter's sonic boom, while the magnetopause is the physical boundary between the Sun's magnetic field and Jupiter's magnetic field. Avery Thompson, Popular Mechanics, 1 July 2016 Listen to the sounds of Juno entering Jupiter's space:In the video, Juno crosses two thresholds: the bow shock and the magnetopause. Avery Thompson, Popular Mechanics, 1 July 2016